| Abies amabilis Douglas ex J.Forbes | 14 images |
| Abies concolor (Gordon & Glend.) Lindl. ex Hildebr. | 725 images |
| Abies grandis (Douglas ex D.Don) Lindl. | 687 images |
| Abies lasiocarpa (Hook.) Nutt. | 182 images |
| Abies magnifica A.Murray bis | 19 images |
| Abies procera Rehder | 377 images |
| Abronia ammophila Greene | 1 images |
| Abronia elliptica A.Nelson | 1 images |
| Abronia fragrans Nutt. ex Hook. | 80 images |
| Abronia latifolia Eschsch. | 192 images |
| Abronia mellifera Douglas ex Hook. | 5 images |
| Abronia umbellata Lam. | 160 images |
| Abutilon incanum (Link) Sweet | 18 images |
| Abutilon theophrasti Medik. | 3365 images |
| Acacia dealbata Link | 6159 images |
| Acaena novae-zelandiae Kirk | 96 images |
| Acanthospermum australe (Loefl.) Kuntze | 117 images |
| Acanthospermum hispidum DC. | 139 images |
| Acer circinatum Pursh | 440 images |
| Acer glabrum Torr. | 166 images |
| Acer grandidentatum Nutt. | 71 images |
| Acer macrophyllum Pursh | 1198 images |
| Acer negundo L. | 18130 images |
| Achillea alpina L. | 23 images |
| Achillea millefolium L. | 26216 images |
| Achillea nobilis L. | 12089 images |
| Achillea ptarmica L. | 3980 images |
| Achlys triphylla DC. | 98 images |
| Achyrachaena mollis Schauer | 91 images |
| Acmispon americanus (Nutt.) Rydb. | 29 images |
| Acmispon brachycarpus (Benth.) D.D.Sokoloff | 1 images |
| Acmispon parviflorus (Benth.) D.D.Sokoloff | 1 images |
| Aconitum columbianum Nutt. | 175 images |
| Acorus calamus L. | 776 images |
| Actaea elata (Nutt.) Prantl | 45 images |
| Actaea rubra (Aiton) Willd. | 800 images |
| Adelinia grande (Douglas ex Lehm.) J.I.Cohen | 365 images |
| Adenocaulon bicolor Hook. | 164 images |
| Adiantum aleuticum (Rupr.) C.A.Paris | 2 images |
| Adiantum capillus-veneris L. | 3386 images |
| Adiantum jordanii Müll.Hal. | 163 images |
| Adonis aestivalis L. | 808 images |
| Adoxa moschatellina L. | 795 images |
| Aegilops cylindrica Host | 63 images |
| Aegopodium podagraria L. | 13156 images |
| Aesculus californica (Spach) Nutt. | 732 images |
| Aesculus hippocastanum L. | 18606 images |
| Aethusa cynapium L. | 2270 images |
| Agalinis tenuifolia (Vahl) Raf. | 109 images |
| Agastache foeniculum (Pursh) Kuntze | 2448 images |
| Agastache urticifolia (Benth.) Kuntze | 103 images |
| Ageratina herbacea (A.Gray) R.M.King & H.Rob. | 17 images |
| Ageratina occidentalis (Hook.) R.M.King & H.Rob. | 30 images |
| Agoseris apargioides (Less.) Greene | 52 images |
| Agoseris aurantiaca (Hook.) Greene | 47 images |
| Agoseris glauca (Pursh) Raf. | 36 images |
| Agoseris grandiflora (Nutt.) Greene | 58 images |
| Agoseris heterophylla (Nutt.) Greene | 45 images |
| Agoseris retrorsa Greene | 28 images |
| Agrimonia eupatoria L. | 12822 images |
| Agrimonia gryposepala Wallr. | 432 images |
| Agrimonia striata Michx. | 20 images |
| Agropyron cristatum (L.) Gaertn. | 137 images |
| Agropyron desertorum (Fisch. ex Link) Schult. | 3 images |
| Agrostemma githago L. | 4419 images |
| Agrostis canina L. | 61 images |
| Agrostis capillaris L. | 2122 images |
| Agrostis densiflora Vasey | 1 images |
| Agrostis exarata Trin. | 11 images |
| Agrostis gigantea Roth | 190 images |
| Agrostis hallii Vasey | 1 images |
| Agrostis mertensii Trin. | 14 images |
| Agrostis microphylla Steud. | 2 images |
| Agrostis pallens Trin. | 4 images |
| Agrostis perennans (Walter) Tuck. | 4 images |
| Agrostis scabra Willd. | 2 images |
| Agrostis stolonifera L. | 423 images |
| Agrostis variabilis Rydb. | 1 images |
| Ailanthus altissima (Mill.) Swingle | 13809 images |
| Aira praecox L. | 114 images |
| Ajuga reptans L. | 22719 images |
| Alcea rosea L. | 15753 images |
| Alchemilla arvensis (L.) Scop. | 528 images |
| Alchemilla australis (Rydb.) Bomble | 59 images |
| Alchemilla filicaulis Buser | 55 images |
| Alchemilla monticola Opiz | 900 images |
| Alhagi maurorum Medik. | 142 images |
| Alisma gramineum Lej. | 25 images |
| Alisma lanceolatum With. | 531 images |
| Alisma subcordatum Raf. | 36 images |
| Alisma triviale Pursh | 38 images |
| Allenrolfea occidentalis (S.Watson) Kuntze | 28 images |
| Alliaria petiolata (M.Bieb.) Cavara & Grande | 32134 images |
| Allionia incarnata L. | 152 images |
| Allium acuminatum Hook. | 56 images |
| Allium amplectens Torr. | 31 images |
| Allium anceps Kellogg | 23 images |
| Allium bisceptrum S.Watson | 20 images |
| Allium bolanderi S.Watson | 4 images |
| Allium brevistylum S.Watson | 3 images |
| Allium campanulatum S.Watson | 20 images |
| Allium cepa L. | 2610 images |
| Allium cernuum Roth | 270 images |
| Allium crenulatum Wiegand | 20 images |
| Allium falcifolium Hook. & Arn. | 44 images |
| Allium geyeri S.Watson | 3 images |
| Allium lemmonii S.Watson | 14 images |
| Allium macropetalum Rydb. | 9 images |
| Allium macrum S.Watson | 1 images |
| Allium nevadense S.Watson | 3 images |
| Allium parvum Kellogg | 11 images |
| Allium peninsulare Lemmon ex Greene | 37 images |
| Allium platycaule S.Watson | 22 images |
| Allium robinsonii L.F.Hend. | 8 images |
| Allium sanbornii Alph.Wood | 7 images |
| Allium schoenoprasum L. | 4903 images |
| Allium siskiyouense Ownbey ex Traub | 2 images |
| Allium tolmiei Baker | 1 images |
| Allium triquetrum L. | 4348 images |
| Allium unifolium Kellogg | 72 images |
| Allium validum S.Watson | 49 images |
| Allotropa virgata Torr. & A.Gray | 11 images |
| Alnus alnobetula (Ehrh.) K.Koch | 1986 images |
| Alnus incana (L.) Moench | 3171 images |
| Alnus rhombifolia Nutt. | 13 images |
| Alnus rubra Bong. | 49 images |
| Alopecurus aequalis Sobol. | 139 images |
| Alopecurus arundinaceus Poir. | 37 images |
| Alopecurus carolinianus Walter | 4 images |
| Alopecurus geniculatus L. | 136 images |
| Alopecurus magellanicus Lam. | 15 images |
| Alopecurus myosuroides Huds. | 584 images |
| Alopecurus pratensis L. | 3005 images |
| Alopecurus saccatus Vasey | 4 images |
| Alyssum alyssoides (L.) L. | 1162 images |
| Alyssum desertorum Stapf | 29 images |
| Alyssum simplex Rudolphi | 182 images |
| Amaranthus albus L. | 594 images |
| Amaranthus blitoides S.Watson | 581 images |
| Amaranthus californicus (Moq.) S.Watson | 12 images |
| Amaranthus caudatus L. | 3969 images |
| Amaranthus cruentus L. | 1318 images |
| Amaranthus deflexus L. | 1985 images |
| Amaranthus hybridus L. | 1697 images |
| Amaranthus palmeri S.Watson | 132 images |
| Amaranthus powellii S.Watson | 140 images |
| Amaranthus retroflexus L. | 9449 images |
| Ambrosia acanthicarpa Hook. | 68 images |
| Ambrosia artemisiifolia L. | 5762 images |
| Ambrosia chamissonis Greene | 140 images |
| Ambrosia confertiflora DC. | 27 images |
| Ambrosia psilostachya DC. | 438 images |
| Ambrosia trifida L. | 1165 images |
| Amelanchier alnifolia (Nutt.) Nutt. ex M.Roem. | 841 images |
| Amelanchier cusickii Fernald | 7 images |
| Amelanchier utahensis Koehne | 77 images |
| Amelichloa brachychaeta (Godr.) Arriaga & Barkworth | 9 images |
| Ammannia coccinea Rottb. | 54 images |
| Ammannia robusta Heer & Regel | 7 images |
| Ammi majus L. | 2543 images |
| Amorpha canescens Pursh | 253 images |
| Amorpha fruticosa L. | 2279 images |
| Amorpha nana Nutt. | 4 images |
| Amsinckia lycopsoides Lindl. ex Lehm. | 1 images |
| Amsinckia menziesii (Lehm.) A.Nelson & J.F.Macbr. | 233 images |
| Amsinckia spectabilis Fisch. & C.A.Mey. | 1 images |
| Amsinckia tessellata A.Gray | 1 images |
| Anaphalis margaritacea (L.) Benth. & Hook.f. | 1550 images |
| Anchusa arvensis (L.) M.Bieb. | 2894 images |
| Anchusa azurea Mill. | 3345 images |
| Anchusa capensis Thunb. | 4 images |
| Anchusa officinalis L. | 5399 images |
| Andromeda polifolia L. | 680 images |
| Andropogon gerardi Vitman | 223 images |
| Andropogon hallii Hack. | 3 images |
| Androsace elongata L. | 60 images |
| Androsace laevigata (A.Gray) Wendelbo | 8 images |
| Androsace montana (A.Gray) Wendelbo | 1 images |
| Androsace occidentalis Pursh | 5 images |
| Androsace septentrionalis L. | 184 images |
| Androstephium breviflorum S.Watson | 7 images |
| Anemonastrum canadense (L.) Mosyakin | 1051 images |
| Anemone cylindrica A.Gray | 15 images |
| Anemone lithophila Rydb. | 1 images |
| Anemone multifida Poir. | 124 images |
| Anemone parviflora Michx. | 15 images |
| Anemone virginiana L. | 403 images |
| Anemopsis californica (Nutt.) Hook. & Arn. | 128 images |
| Anethum graveolens L. | 2930 images |
| Angelica arguta Nutt. | 6 images |
| Angelica capitellata (A.Gray) Spalik, Reduron & S.R.Downie | 139 images |
| Angelica lucida L. | 55 images |
| Angelica pinnata S.Watson | 2 images |
| Angelica tomentosa S.Watson | 3 images |
| Anisocarpus madioides Nutt. | 16 images |
| Anoda cristata (L.) Schltdl. | 66 images |
| Antennaria alpina (L.) Gaertn. | 31 images |
| Antennaria howellii Greene | 23 images |
| Antennaria lanata Greene | 10 images |
| Antennaria marginata Greene | 1 images |
| Antennaria media Greene | 9 images |
| Antennaria microphylla Rydb. | 6 images |
| Antennaria monocephala DC. | 2 images |
| Antennaria neglecta Greene | 202 images |
| Antennaria parvifolia Nutt. | 99 images |
| Antennaria rosea Greene | 6 images |
| Antennaria umbrinella Rydb. | 2 images |
| Anthemis arvensis L. | 4329 images |
| Anthemis cotula L. | 1752 images |
| Anthoxanthum aristatum Boiss. | 59 images |
| Anthoxanthum nitens (Weber) Y.Schouten & Veldkamp | 81 images |
| Anthoxanthum occidentale (Buckley) Veldkamp | 6 images |
| Anthoxanthum odoratum L. | 2507 images |
| Anthriscus caucalis M.Bieb. | 1850 images |
| Anthriscus cerefolium (L.) Hoffm. | 3473 images |
| Anthriscus sylvestris (L.) Hoffm. | 20222 images |
| Anticlea elegans (Pursh) Rydb. | 67 images |
| Antirrhinum majus L. | 15738 images |
| Apera interrupta (L.) P.Beauv. | 32 images |
| Apera spica-venti (L.) P.Beauv. | 113 images |
| Apios americana Medik. | 351 images |
| Apium graveolens L. | 2058 images |
| Apium prostratum Labill. ex Vent. | 29 images |
| Apocynum androsaemifolium L. | 1124 images |
| Apocynum cannabinum L. | 1116 images |
| Aquilegia barnebyi Munz | 3 images |
| Aquilegia brevistyla Hook. | 1 images |
| Aquilegia chrysantha A.Gray | 80 images |
| Aquilegia coerulea E.James | 8 images |
| Aquilegia elegantula Greene | 18 images |
| Aquilegia flavescens S.Watson | 19 images |
| Aquilegia formosa Fisch. ex DC. | 74 images |
| Aquilegia jonesii Parry | 2 images |
| Aquilegia saximontana Rydb. | 365 images |
| Aquilegia vulgaris L. | 21110 images |
| Arabidopsis lyrata (L.) O'Kane & Al-Shehbaz | 2 images |
| Arabidopsis thaliana (L.) Heynh. | 2200 images |
| Arabis aculeolata Greene | 4 images |
| Arabis alpina L. | 1917 images |
| Arabis hirsuta (L.) Scop. | 1583 images |
| Arabis modesta Rollins | 7 images |
| Aralia californica S.Watson | 181 images |
| Aralia elata (Miq.) Seem. | 907 images |
| Aralia nudicaulis L. | 933 images |
| Arbutus menziesii Pursh | 843 images |
| Arceuthobium campylopodum Engelm. | 33 images |
| Arceuthobium divaricatum Engelm. | 2 images |
| Arceuthobium douglasii Engelm. | 4 images |
| Arctium lappa L. | 11200 images |
| Arctium minus (Hill) Bernh. | 12639 images |
| Arctium tomentosum Mill. | 2412 images |
| Arctostaphylos × media Greene | 4 images |
| Arctostaphylos canescens Eastw. | 29 images |
| Arctostaphylos columbiana Piper | 123 images |
| Arctostaphylos glandulosa Eastw. | 74 images |
| Arctostaphylos patula Greene | 132 images |
| Arctostaphylos uva-ursi (L.) Spreng. | 2288 images |
| Arctostaphylos viscida Parry | 79 images |
| Arenaria lanuginosa (Michx.) Rohrb. | 8 images |
| Arenaria serpyllifolia L. | 1559 images |
| Argemone corymbosa Greene | 55 images |
| Argemone munita Durand & Hilg. | 5 images |
| Argemone polyanthemos (Fedde) Ownbey | 19 images |
| Argemone squarrosa Greene | 7 images |
| Argentina anserina (L.) Rydb. | 5661 images |
| Aristida adscensionis L. | 159 images |
| Aristida purpurea Nutt. | 12 images |
| Armeria maritima (Mill.) Willd. | 6344 images |
| Armoracia rusticana G.Gaertn., B.Mey. & Scherb. | 294 images |
| Arnica angustifolia Vahl | 2 images |
| Arnica cernua Howell | 3 images |
| Arnica chamissonis Less. | 107 images |
| Arnica cordifolia Hook. | 226 images |
| Arnica discoidea Benth. | 2 images |
| Arnica fulgens Pursh | 7 images |
| Arnica gracilis Rydb. | 1 images |
| Arnica lanceolata Nutt. | 22 images |
| Arnica latifolia Bong. | 37 images |
| Arnica lonchophylla Greene | 7 images |
| Arnica mollis Hook. | 22 images |
| Arnica nevadensis A.Gray | 4 images |
| Arnica rydbergii Greene | 3 images |
| Arnica sororia Greene | 3 images |
| Arnica spathulata Greene | 3 images |
| Arrhenatherum elatius (L.) P.Beauv. ex J.Presl & C.Presl | 2475 images |
| Artemisia abrotanum L. | 1583 images |
| Artemisia absinthium L. | 5535 images |
| Artemisia annua L. | 3866 images |
| Artemisia arbuscula Nutt. | 21 images |
| Artemisia biennis Willd. | 169 images |
| Artemisia campestris L. | 1959 images |
| Artemisia cana Pursh | 36 images |
| Artemisia douglasiana Besser | 16 images |
| Artemisia dracunculus L. | 2638 images |
| Artemisia filifolia Torr. | 42 images |
| Artemisia frigida Willd. | 144 images |
| Artemisia laciniata Willd. | 4 images |
| Artemisia ludoviciana Nutt. | 1325 images |
| Artemisia michauxiana Besser | 8 images |
| Artemisia nova A.Nelson | 4 images |
| Artemisia pycnocephala (Less.) DC. | 89 images |
| Artemisia spinescens D.C.Eaton | 1 images |
| Artemisia stelleriana Besser | 231 images |
| Artemisia suksdorfii Piper | 52 images |
| Artemisia tilesii Ledeb. | 9 images |
| Artemisia tridentata Nutt. | 364 images |
| Artemisia vulgaris L. | 18946 images |
| Arthraxon hispidus (Thunb.) Makino | 52 images |
| Aruncus dioicus (Walter) Fernald | 5307 images |
| Asarum caudatum Lindl. | 184 images |
| Asarum hartwegii S.Watson | 71 images |
| Asclepias arenaria Torr. | 17 images |
| Asclepias asperula (Decne.) Woodson | 459 images |
| Asclepias cordifolia (Benth.) Jeps. | 82 images |
| Asclepias cryptoceras S.Watson | 8 images |
| Asclepias engelmanniana Woodson | 8 images |
| Asclepias fascicularis Decne. | 257 images |
| Asclepias hallii A.Gray | 10 images |
| Asclepias incarnata L. | 1340 images |
| Asclepias involucrata Engelm. ex Torr. | 2 images |
| Asclepias latifolia (Torr.) Raf. | 132 images |
| Asclepias macrotis Torr. | 5 images |
| Asclepias ovalifolia Decne. | 8 images |
| Asclepias pumila (A.Gray) Vail | 6 images |
| Asclepias speciosa Torr. | 777 images |
| Asclepias stenophylla A.Gray | 20 images |
| Asclepias subverticillata (A.Gray) Vail | 20 images |
| Asclepias syriaca L. | 4311 images |
| Asclepias tuberosa L. | 2660 images |
| Asclepias uncialis Greene | 2 images |
| Asclepias verticillata L. | 206 images |
| Asclepias viridiflora Raf. | 215 images |
| Asparagus officinalis L. | 3509 images |
| Asperugo procumbens L. | 471 images |
| Asplenium adiantum-nigrum L. | 1570 images |
| Asplenium platyneuron (L.) Britton, Sterns & Poggenb. | 375 images |
| Asplenium resiliens Kunze | 11 images |
| Asplenium septentrionale (L.) Hoffm. | 444 images |
| Asplenium trichomanes L. | 6625 images |
| Asplenium viride Huds. | 621 images |
| Aster alpinus L. | 3761 images |
| Astragalus alpinus L. | 435 images |
| Astragalus canadensis L. | 52 images |
| Astragalus chinensis L.f. | 3 images |
| Astragalus cicer L. | 438 images |
| Astragalus crassicarpus Nutt. | 73 images |
| Astragalus lotiflorus Hook. | 8 images |
| Astragalus missouriensis Nutt. | 43 images |
| Astragalus mollissimus Torr. | 65 images |
| Astragalus nuttallianus DC. | 19 images |
| Astragalus purshii Douglas ex G.Don | 12 images |
| Astragalus racemosus Pursh | 25 images |
| Astragalus reventiformis (Rydb.) Barneby | 4 images |
| Astragalus schmolliae Ced.Porter | 1 images |
| Astragalus sheldonii (Rydb.) Barneby | 3 images |
| Astragalus tenellus Pursh | 5 images |
| Athyrium filix-femina (L.) Roth | 4234 images |
| Athysanus pusillus (Hook.) Greene | 1 images |
| Atocion armeria (L.) Raf. | 3103 images |
| Atriplex argentea Nutt. | 3 images |
| Atriplex canescens (Pursh) Nutt. | 202 images |
| Atriplex hortensis L. | 1173 images |
| Atriplex littoralis L. | 390 images |
| Atriplex micrantha Ledeb. | 73 images |
| Atriplex oblongifolia Waldst. & Kit. | 28 images |
| Atriplex obovata Moq. | 5 images |
| Atriplex patula L. | 867 images |
| Atriplex prostrata Boucher ex DC. | 1584 images |
| Atriplex rosea L. | 50 images |
| Atriplex semibaccata R.Br. | 125 images |
| Aucuba japonica Thunb. | 6554 images |
| Avena barbata Pott ex Link | 1351 images |
| Avena fatua L. | 2871 images |
| Avena sativa L. | 3922 images |
| Avena sterilis L. | 267 images |
| Avenella flexuosa (L.) Drejer | 542 images |
| Azolla filiculoides Lam. | 346 images |
| Baccharis douglasii DC. | 47 images |
| Baccharis pilularis DC. | 747 images |
| Baccharis salicifolia (Ruiz & Pav.) Pers. | 30 images |
| Baccharis salicina Torr. & A.Gray | 26 images |
| Bacopa rotundifolia (Michx.) Wettst. | 6 images |
| Balsamorhiza careyana A.Gray | 3 images |
| Balsamorhiza deltoidea Nutt. | 7 images |
| Balsamorhiza hookeri Nutt. | 46 images |
| Balsamorhiza incana Nutt. | 6 images |
| Balsamorhiza macrolepis W.M.Sharp | 1 images |
| Balsamorhiza macrophylla Nutt. | 1 images |
| Balsamorhiza sericea W.A.Weber | 1 images |
| Balsamorhiza serrata A.Nelson & J.F.Macbr. | 1 images |
| Baptisia australis (L.) R.Br. | 1326 images |
| Barbarea orthoceras Ledeb. | 572 images |
| Barbarea stricta Andrz. ex Besser | 80 images |
| Barbarea verna (Mill.) Asch. | 1611 images |
| Barbarea vulgaris W.T.Aiton | 1290 images |
| Bassia hyssopifolia (Pall.) Kuntze | 44 images |
| Bassia scoparia (L.) A.J.Scott | 543 images |
| Beckmannia syzigachne (Steud.) Fernald | 18 images |
| Bellis perennis L. | 14856 images |
| Bensoniella oregona (Abrams & Bacig.) Morton | 2 images |
| Berberis aquifolium Pursh | 17138 images |
| Berberis darwinii Hook. | 2008 images |
| Berberis fendleri A.Gray | 3 images |
| Berberis fremontii Torr. | 16 images |
| Berberis haematocarpa Wooton | 14 images |
| Berberis nervosa Pursh | 23 images |
| Berberis pinnata Lag. | 12 images |
| Berberis repens Lindl. | 1875 images |
| Berberis thunbergii DC. | 9529 images |
| Berberis vulgaris L. | 5846 images |
| Berlandiera lyrata Benth. | 80 images |
| Berteroa incana (L.) DC. | 5518 images |
| Berula erecta (Huds.) Coville | 861 images |
| Betula glandulosa Michx. | 10 images |
| Betula occidentalis Hook. | 45 images |
| Betula papyrifera Marshall | 576 images |
| Betula pendula Roth | 12133 images |
| Betula pumila L. | 11 images |
| Bidens cernua L. | 586 images |
| Bidens connata Muhl. ex Willd. | 68 images |
| Bidens frondosa L. | 3520 images |
| Bidens tripartita L. | 1294 images |
| Bidens vulgata Greene | 81 images |
| Bistorta bistortoides (Pursh) Small | 1 images |
| Bistorta vivipara (L.) Delarbre | 1466 images |
| Blechnum spicant (L.) Roth | 2149 images |
| Blepharipappus scaber Hook. | 23 images |
| Blitum capitatum L. | 236 images |
| Blitum virgatum L. | 138 images |
| Boechera drummondii (A.Gray) Á.Löve & D.Löve | 3 images |
| Bolboschoenus fluviatilis (Torr.) Soják | 3 images |
| Bolboschoenus glaucus (Lam.) S.G.Sm. | 18 images |
| Bolboschoenus maritimus (L.) Palla | 875 images |
| Boltonia asteroides L'Hér. | 5 images |
| Borago officinalis L. | 20896 images |
| Bothriochloa barbinodis (Lag.) Herter | 517 images |
| Bothriochloa bladhii (Retz.) S.T.Blake | 278 images |
| Bothriochloa ischaemum (L.) Keng | 629 images |
| Botrychium lanceolatum (S.G.Gmel.) Ångstr. | 8 images |
| Botrychium lunaria (L.) Sw. | 590 images |
| Botrychium multifidum (S.G.Gmel.) Rupr. | 2 images |
| Botrychium simplex E.Hitchc. | 49 images |
| Botrychium virginianum (L.) Sw. | 230 images |
| Bouteloua barbata Lag. | 1 images |
| Bouteloua curtipendula (Michx.) Torr. | 124 images |
| Bouteloua dactyloides (Nutt.) Columbus | 2 images |
| Bouteloua gracilis (Kunth) Lag. ex Griffiths | 75 images |
| Bouteloua simplex Lag. | 10 images |
| Bowlesia incana Ruiz & Pav. | 346 images |
| Boykinia occidentalis Torr. & A.Gray | 8 images |
| Brachypodium pinnatum (L.) P.Beauv. | 566 images |
| Brachypodium sylvaticum (Huds.) P.Beauv. | 1773 images |
| Brasenia schreberi J.F.Gmel. | 16 images |
| Brassica elongata Ehrh. | 22 images |
| Brassica juncea (L.) Czern. | 1684 images |
| Brassica napus L. | 10098 images |
| Brassica oleracea L. | 8946 images |
| Brassica rapa L. | 4076 images |
| Brewerimitella breweri (A.Gray) R.A.Folk & Y.Okuyama | 39 images |
| Brewerimitella ovalis (Greene) R.A.Folk & Y.Okuyama | 8 images |
| Brickellia atractyloides A.Gray | 1 images |
| Brickellia californica (Torr. & A.Gray) A.Gray | 45 images |
| Brickellia eupatorioides (L.) Shinners | 85 images |
| Brickellia grandiflora (Hook.) Nutt. | 9 images |
| Brickellia longifolia S.Watson | 7 images |
| Brickellia microphylla (Nutt.) A.Gray | 2 images |
| Brickellia oblongifolia Nutt. | 3 images |
| Briza maxima L. | 2100 images |
| Briza media L. | 1150 images |
| Briza minor L. | 349 images |
| Brodiaea coronaria (Salisb.) Jeps. | 19 images |
| Brodiaea elegans Hoover | 138 images |
| Brodiaea terrestris Kellogg | 53 images |
| Bromus arvensis L. | 156 images |
| Bromus carinatus Hook. & Arn. | 30 images |
| Bromus catharticus Vahl | 468 images |
| Bromus cebadilla Steud. | 2 images |
| Bromus ciliatus L. | 1 images |
| Bromus commutatus Schrad. | 103 images |
| Bromus diandrus Roth | 1385 images |
| Bromus erectus Huds. | 1157 images |
| Bromus grossus Desf. ex DC. | 1 images |
| Bromus hordeaceus L. | 3124 images |
| Bromus inermis Leyss. | 856 images |
| Bromus latiglumis (Shear) Hitchc. | 2 images |
| Bromus madritensis L. | 555 images |
| Bromus marginatus Nees ex Steud. | 1 images |
| Bromus pubescens Muhl. ex Willd. | 5 images |
| Bromus racemosus L. | 191 images |
| Bromus rigidus Roth | 14 images |
| Bromus rubens L. | 394 images |
| Bromus secalinus L. | 251 images |
| Bromus sitchensis Trin. | 9 images |
| Bromus squarrosus L. | 129 images |
| Bromus sterilis L. | 2934 images |
| Bromus suksdorfii Vasey | 6 images |
| Bromus tectorum L. | 459 images |
| Bromus vulgaris (Hook.) Shear | 1 images |
| Bryonia alba L. | 3194 images |
| Buddleja davidii Franch. | 17838 images |
| Buglossoides arvensis (L.) I.M.Johnst. | 1189 images |
| Bupleurum americanum J.M.Coult. & Rose | 1 images |
| Butomus umbellatus L. | 1818 images |
| Cabomba caroliniana A.Gray | 63 images |
| Cacaliopsis nardosmia (A.Gray) A.Gray | 12 images |
| Cakile edentula (Bigelow) Hook. | 282 images |
| Cakile maritima Scop. | 6904 images |
| Calamagrostis arenaria (L.) Roth | 1783 images |
| Calamagrostis breviligulata (Fernald) Saarela | 69 images |
| Calamagrostis canadensis (Michx.) P.Beauv. | 4 images |
| Calamagrostis koelerioides Vasey | 2 images |
| Calamagrostis purpurea (Trin.) Trin. | 25 images |
| Calamagrostis sesquiflora (Trin.) Tzvelev | 5 images |
| Calamagrostis stricta (Timm) Koeler | 35 images |
| Calandrinia ciliata (Ruiz & Pav.) DC. | 35 images |
| Calendula officinalis L. | 16297 images |
| Callirhoe involucrata (Torr. & A.Gray) A.Gray | 56 images |
| Callitriche fassettii Schotsman | 2 images |
| Callitriche hamulata Kütz. ex W.D.J.Koch | 11 images |
| Callitriche hermaphroditica L. | 7 images |
| Callitriche heterophylla Pursh | 3 images |
| Callitriche marginata Torr. | 8 images |
| Callitriche palustris L. | 421 images |
| Callitriche stagnalis Scop. | 740 images |
| Callitropsis nootkatensis (D.Don) Oerst. | 590 images |
| Calluna vulgaris (L.) Hull | 9973 images |
| Calocedrus decurrens (Torr.) Florin | 3382 images |
| Calochortus apiculatus Baker | 29 images |
| Calochortus aureus S.Watson | 31 images |
| Calochortus bruneaunis A.Nelson & J.F.Macbr. | 46 images |
| Calochortus elegans Pursh | 20 images |
| Calochortus eurycarpus S.Watson | 32 images |
| Calochortus flexuosus S.Watson | 49 images |
| Calochortus greenei S.Watson | 10 images |
| Calochortus gunnisonii S.Watson | 84 images |
| Calochortus howellii S.Watson | 23 images |
| Calochortus leichtlinii Hook.f. | 151 images |
| Calochortus longibarbatus S.Watson | 11 images |
| Calochortus lyallii Baker | 15 images |
| Calochortus macrocarpus Douglas | 76 images |
| Calochortus nitidus Douglas | 1 images |
| Calochortus nudus S.Watson | 23 images |
| Calochortus nuttallii Torr. | 54 images |
| Calochortus persistens Ownbey | 15 images |
| Calochortus subalpinus Piper | 23 images |
| Calochortus tolmiei Hook. & Arn. | 140 images |
| Calochortus umpquaensis Fredricks | 2 images |
| Calochortus uniflorus Hook. & Arn. | 59 images |
| Caltha leptosepala DC. | 156 images |
| Caltha palustris L. | 11058 images |
| Calycadenia truncata DC. | 15 images |
| Calypso bulbosa (L.) Oakes | 454 images |
| Calyptridium monospermum Greene | 53 images |
| Calyptridium roseum S.Watson | 1 images |
| Calyptridium umbellatum (Torr.) Greene | 96 images |
| Calystegia atriplicifolia Hallier f. | 6 images |
| Calystegia occidentalis (A.Gray) Brummitt | 34 images |
| Calystegia sepium (L.) R.Br. | 10465 images |
| Calystegia silvatica (Kit.) Griseb. | 2716 images |
| Calystegia soldanella (L.) R.Br. | 2047 images |
| Camassia cusickii S.Watson | 158 images |
| Camassia leichtlinii (Baker) S.Watson | 799 images |
| Camassia quamash (Pursh) Greene | 822 images |
| Camelina alyssum (Mill.) Thell. | 3 images |
| Camelina microcarpa Andrz. ex DC. | 117 images |
| Camelina rumelica Velen. | 18 images |
| Camelina sativa (L.) Crantz | 235 images |
| Camissoniopsis cheiranthifolia (Hornem. ex Spreng.) W.L.Wagner & Hoch | 2 images |
| Campanula glomerata L. | 8639 images |
| Campanula lasiocarpa Cham. | 17 images |
| Campanula medium L. | 3129 images |
| Campanula persicifolia L. | 10922 images |
| Campanula piperi Howell | 6 images |
| Campanula rapunculoides L. | 6016 images |
| Campanula scabrella Engelm. | 8 images |
| Campsis radicans (L.) Bureau | 7808 images |
| Cannabis sativa L. | 5870 images |
| Capnoides sempervirens (L.) Borkh. | 122 images |
| Capsella bursa-pastoris (L.) Medik. | 10240 images |
| Caragana arborescens Lam. | 1885 images |
| Cardamine angulata Hook. | 8 images |
| Cardamine bellidifolia L. | 32 images |
| Cardamine californica (Nutt.) Greene | 9 images |
| Cardamine flexuosa With. | 5529 images |
| Cardamine hirsuta L. | 4128 images |
| Cardamine nuttallii Greene | 56 images |
| Cardamine oligosperma Nutt. | 53 images |
| Cardamine parviflora L. | 1975 images |
| Cardamine pensylvanica Muhl. ex Willd. | 7 images |
| Cardionema ramosissima (Weinm.) A.Nelson & J.F.Macbr. | 9 images |
| Carduus acanthoides L. | 4162 images |
| Carduus nutans L. | 5131 images |
| Carduus pycnocephalus L. | 4641 images |
| Carduus tenuiflorus Curtis | 1484 images |
| Carex amplifolia Boott | 1 images |
| Carex aquatilis Wahlenb. | 21 images |
| Carex arcta Boott | 6 images |
| Carex arenaria L. | 298 images |
| Carex atherodes Spreng. | 5 images |
| Carex aurea Nutt. | 18 images |
| Carex barbarae Dewey | 6 images |
| Carex blanda Dewey | 41 images |
| Carex breweri Boott | 16 images |
| Carex brunnescens (Pers.) Poir. | 41 images |
| Carex buxbaumii Wahlenb. | 72 images |
| Carex canescens L. | 138 images |
| Carex capillaris L. | 52 images |
| Carex capitata Sol. | 1 images |
| Carex chordorrhiza L.f. | 38 images |
| Carex comosa Boott | 44 images |
| Carex deweyana Schwein. | 7 images |
| Carex diandra Schrank | 81 images |
| Carex diluta M.Bieb. | 2 images |
| Carex disperma Dewey | 3 images |
| Carex ebenea Rydb. | 1 images |
| Carex eburnea Boott | 28 images |
| Carex echinata Murray | 314 images |
| Carex emoryi Dewey | 8 images |
| Carex filifolia Nutt. | 8 images |
| Carex flava L. | 328 images |
| Carex garberi Fernald | 1 images |
| Carex glacialis Mack. | 53 images |
| Carex granularis Muhl. ex Willd. | 12 images |
| Carex hoodii Boott | 3 images |
| Carex hystericina Muhl. ex Willd. | 33 images |
| Carex inops L.H.Bailey | 1 images |
| Carex kobomugi Ohwi | 3 images |
| Carex lachenalii Schkuhr | 46 images |
| Carex lacustris Willd. | 15 images |
| Carex laeviconica Dewey | 3 images |
| Carex laeviculmis Meinsh. | 3 images |
| Carex lasiocarpa Ehrh. | 53 images |
| Carex leporina L. | 331 images |
| Carex leporinella Mack. | 1 images |
| Carex leptopoda Mack. | 4 images |
| Carex limosa L. | 121 images |
| Carex livida (Wahlenb.) Willd. | 6 images |
| Carex longii Mack. | 13 images |
| Carex luzulina Olney | 8 images |
| Carex lyngbyei Hornem. | 8 images |
| Carex macrocephala Willd. ex Spreng. | 8 images |
| Carex magellanica Lam. | 67 images |
| Carex mertensii J.D.Prescott ex Bong. | 5 images |
| Carex microglochin Wahlenb. | 77 images |
| Carex microptera Mack. | 5 images |
| Carex molesta Mack. | 8 images |
| Carex myosuroides Vill. | 45 images |
| Carex norvegica Retz. | 21 images |
| Carex obtusata Lilj. | 5 images |
| Carex oederi Retz. | 311 images |
| Carex pauciflora Lightf. | 91 images |
| Carex paysonis Clokey | 4 images |
| Carex pendula Huds. | 4744 images |
| Carex phaeocephala Piper | 1 images |
| Carex prairea Dewey ex Alph.Wood | 2 images |
| Carex praticola Rydb. | 1 images |
| Carex pumila Thunb. | 27 images |
| Carex raynoldsii Dewey | 1 images |
| Carex retrorsa Schwein. | 12 images |
| Carex rosea Willd. | 1 images |
| Carex rostrata Stokes | 372 images |
| Carex rupestris All. | 51 images |
| Carex sartwellii Dewey | 4 images |
| Carex scirpoidea Michx. | 2 images |
| Carex simpliciuscula Wahlenb. | 10 images |
| Carex spectabilis Dewey | 6 images |
| Carex sprengelii Dewey ex Spreng. | 7 images |
| Carex stipata Muhl. ex Willd. | 63 images |
| Carex tenera Dewey | 8 images |
| Carex tenuiflora Wahlenb. | 2 images |
| Carex trichocarpa Muhl. ex Willd. | 15 images |
| Carex tumulicola Mack. | 2 images |
| Carex utriculata Boott | 9 images |
| Carex vaginata Tausch | 64 images |
| Carex vallicola Dewey | 2 images |
| Carex vesicaria L. | 336 images |
| Carex vulpinoidea Michx. | 139 images |
| Carpobrotus chilensis (Molina) N.E.Br. | 63 images |
| Carthamus lanatus L. | 1815 images |
| Carthamus tinctorius L. | 1074 images |
| Carum carvi L. | 1540 images |
| Cassiope lycopodioides (Pall.) D.Don | 2 images |
| Cassiope mertensiana (Bong.) G.Don | 21 images |
| Cassiope stelleriana (Pall.) DC. | 3 images |
| Cassiope tetragona (L.) D.Don | 21 images |
| Castilleja ambigua Hook. & Arn. | 2 images |
| Castilleja angustifolia (Nutt.) G.Don | 7 images |
| Castilleja applegatei Fernald | 323 images |
| Castilleja arachnoidea Greenm. | 39 images |
| Castilleja attenuata (A.Gray) T.I.Chuang & Heckard | 4 images |
| Castilleja campestris (Benth.) T.I.Chuang & Heckard | 1 images |
| Castilleja chromosa A.Nelson | 1 images |
| Castilleja chrysantha Greenm. | 1 images |
| Castilleja crista-galli Rydb. | 3 images |
| Castilleja cusickii Greenm. | 17 images |
| Castilleja hispida Benth. | 48 images |
| Castilleja integra A.Gray | 8 images |
| Castilleja levisecta Greenm. | 6 images |
| Castilleja linariifolia Benth. | 97 images |
| Castilleja mendocinensis (Eastw.) Pennell | 32 images |
| Castilleja miniata Douglas ex Benth. | 419 images |
| Castilleja minor (A.Gray) A.Gray | 38 images |
| Castilleja occidentalis Torr. | 25 images |
| Castilleja parviflora Bong. | 111 images |
| Castilleja peckiana Pennell | 4 images |
| Castilleja pruinosa Fernald | 22 images |
| Castilleja pulchella Rydb. | 1 images |
| Castilleja rhexiifolia Rydb. | 11 images |
| Castilleja rupicola Piper ex Fernald | 20 images |
| Castilleja scabrida Eastw. | 12 images |
| Castilleja schizotricha Greenm. | 2 images |
| Castilleja septentrionalis Lindl. | 28 images |
| Castilleja sessiliflora Pursh | 14 images |
| Castilleja thompsonii Pennell | 9 images |
| Catabrosa aquatica (L.) P.Beauv. | 75 images |
| Catalpa bignonioides Walter | 15300 images |
| Catalpa speciosa Teas | 768 images |
| Ceanothus cordulatus Kellogg | 61 images |
| Ceanothus cuneatus (Hook.) Nutt. | 164 images |
| Ceanothus fendleri A.Gray | 4 images |
| Ceanothus herbaceus Raf. | 35 images |
| Ceanothus integerrimus Hook. & Arn. | 20 images |
| Ceanothus parryi Trel. | 10 images |
| Ceanothus prostratus Benth. | 98 images |
| Ceanothus sanguineus Pursh | 14 images |
| Ceanothus thyrsiflorus Eschw. | 4493 images |
| Ceanothus velutinus Douglas ex Hook. | 108 images |
| Celastrus orbiculatus Thunb. | 951 images |
| Celastrus scandens L. | 1127 images |
| Celtis occidentalis L. | 4315 images |
| Cenchrus alopecuroides (L.) Thunb. | 840 images |
| Cenchrus americanus (L.) Morrone | 142 images |
| Cenchrus longisetus M.C.Johnst. | 1202 images |
| Cenchrus longispinus (Hack.) Fernald | 95 images |
| Cenchrus setaceus (Forssk.) Morrone | 3152 images |
| Cenchrus spinifex Cav. | 43 images |
| Centaurea × gerstlaueri Erdner | 1 images |
| Centaurea benedicta (L.) L. | 364 images |
| Centaurea calcitrapa L. | 1889 images |
| Centaurea cyanus L. | 18154 images |
| Centaurea diffusa Lam. | 251 images |
| Centaurea iberica Trevir. ex Spreng. | 71 images |
| Centaurea jacea L. | 15424 images |
| Centaurea macrocephala Muss.Puschk. ex Willd. | 552 images |
| Centaurea melitensis L. | 840 images |
| Centaurea montana L. | 9811 images |
| Centaurea nigra L. | 9153 images |
| Centaurea nigrescens Willd. | 1229 images |
| Centaurea scabiosa L. | 9520 images |
| Centaurea solstitialis L. | 1392 images |
| Centaurea stoebe L. | 1125 images |
| Centaurea virgata Lam. | 46 images |
| Centaurium erythraea Rafn | 8725 images |
| Centaurium pulchellum (Sw.) Hayek ex Hand.-Mazz., Stadlm., Janch. & Faltis | 64 images |
| Centaurium tenuiflorum (Hoffmanns. & Link) Fritsch | 284 images |
| Centella asiatica (L.) Urb. | 1141 images |
| Centella erecta (L.f.) Fernald | 20 images |
| Centromadia pungens Greene | 3 images |
| Cephalanthera austiniae (A.Gray) A.Heller | 69 images |
| Cerastium beeringianum Cham. & Schltdl. | 1 images |
| Cerastium brachypetalum Desp. ex Pers. | 68 images |
| Cerastium dichotomum L. | 12 images |
| Cerastium glomeratum Thuill. | 4786 images |
| Cerastium holosteoides Fr. | 13 images |
| Cerastium nutans Raf. | 9 images |
| Cerastium pumilum Curtis | 421 images |
| Cerastium semidecandrum L. | 500 images |
| Cerastium tomentosum L. | 6971 images |
| Ceratophyllum demersum L. | 371 images |
| Cercis occidentalis Torr. ex A.Gray | 230 images |
| Cercocarpus betuloides Nutt. | 5 images |
| Cercocarpus intricatus S.Watson | 1 images |
| Cercocarpus ledifolius Nutt. | 30 images |
| Cercocarpus montanus Raf. | 202 images |
| Chaenactis stevioides Hook. & Arn. | 69 images |
| Chaenactis suffrutescens A.Gray | 8 images |
| Chaenactis xantiana A.Gray | 11 images |
| Chaenorhinum minus (L.) Lange | 808 images |
| Chaerophyllum temulum L. | 6503 images |
| Chaetadelpha wheeleri A.Gray ex S.Watson | 7 images |
| Chamaebatiaria millefolium (Torr.) Maxim. | 84 images |
| Chamaechaenactis scaposa Rydb. | 4 images |
| Chamaecyparis lawsoniana (A.Murray bis) Parl. | 6304 images |
| Chamaerhodos erecta (L.) Bunge | 1 images |
| Chelidonium majus L. | 27492 images |
| Chenopodiastrum murale (L.) S.Fuentes, Uotila & Borsch | 1531 images |
| Chenopodium album L. | 15737 images |
| Chenopodium berlandieri Moq. | 50 images |
| Chenopodium betaceum Andrz. | 9 images |
| Chenopodium ficifolium Sm. | 2031 images |
| Chenopodium pratericola Rydb. | 25 images |
| Chenopodium standleyanum Aellen | 3 images |
| Cherleria obtusiloba (Rydb.) A.J.Moore & Dillenb. | 19 images |
| Chimaphila umbellata (L.) W.P.C.Barton | 160 images |
| Chionophila jamesii Benth. | 4 images |
| Chloris radiata (L.) Sw. | 14 images |
| Chloris verticillata Nutt. | 33 images |
| Chloris virgata Sw. | 78 images |
| Chlorogalum angustifolium Kellogg | 3 images |
| Chlorogalum pomeridianum (DC.) Kunth | 247 images |
| Chondrilla juncea L. | 2263 images |
| Chorispora tenella (Pall.) DC. | 224 images |
| Chorizanthe brevicornu Torr. | 28 images |
| Chorizanthe membranacea Benth. | 30 images |
| Chrysolepis chrysophylla (Douglas ex Hook.) Hjelmq. | 25 images |
| Chrysolepis sempervirens (Kellogg) Hjelmq. | 32 images |
| Chrysosplenium glechomifolium Nutt. | 1 images |
| Chylismia claviformis (Torr. & Frém.) A.Heller | 1 images |
| Chylismia scapoidea (Torr. & A.Gray) Small | 1 images |
| Chylismia walkeri A.Nelson | 1 images |
| Cicendia quadrangularis (Lam.) Griseb. | 5 images |
| Cichorium intybus L. | 20452 images |
| Cicuta bulbifera L. | 42 images |
| Cicuta douglasii (DC.) J.M.Coult. & Rose | 1 images |
| Cicuta maculata L. | 380 images |
| Cinna arundinacea L. | 18 images |
| Circaea alpina L. | 281 images |
| Circaea canadensis (L.) Hill | 78 images |
| Cirsium andersonii Petr. | 35 images |
| Cirsium arizonicum (A.Gray) Petr. | 13 images |
| Cirsium arvense (L.) Scop. | 18023 images |
| Cirsium brevistylum Cronquist | 69 images |
| Cirsium douglasii DC. | 14 images |
| Cirsium eatonii B.L.Rob. | 7 images |
| Cirsium edule Nutt. | 40 images |
| Cirsium flodmanii Arthur | 9 images |
| Cirsium foliosum DC. | 31 images |
| Cirsium hookerianum Nutt. | 13 images |
| Cirsium occidentale (Nutt.) Jeps. | 121 images |
| Cirsium ochrocentrum A.Gray | 4 images |
| Cirsium parryi Petr. | 5 images |
| Cirsium remotifolium DC. | 7 images |
| Cirsium scariosum Nutt. | 8 images |
| Cirsium undulatum Spreng. | 128 images |
| Cirsium vulgare (Savi) Ten. | 22222 images |
| Cladanthus mixtus (L.) Chevall. | 426 images |
| Cladoraphis cyperoides (Thunb.) S.M.Phillips | 7 images |
| Clarkia amoena (Lehm.) A.Nelson & J.F.Macbr. | 1440 images |
| Clarkia gracilis (Piper) A.Nelson & J.F.Macbr. | 1 images |
| Clarkia pulchella Pursh | 55 images |
| Clarkia purpurea (Curtis) A.Nelson & J.F.Macbr. | 12 images |
| Clarkia rhomboidea Douglas | 65 images |
| Claytonia lanceolata Pursh | 40 images |
| Claytonia megarhiza (A.Gray) Parry ex S.Watson | 4 images |
| Claytonia parviflora Douglas | 53 images |
| Claytonia perfoliata Donn ex Willd. | 3473 images |
| Claytonia rosea Rydb. | 9 images |
| Claytonia rubra (Howell) Tidestr. | 72 images |
| Claytonia sibirica L. | 1105 images |
| Clematis columbiana (Nutt.) Torr. & A.Gray | 6 images |
| Clematis hirsutissima Pursh | 35 images |
| Clematis ligusticifolia Nutt. | 97 images |
| Clematis occidentalis (Hornem.) DC. | 62 images |
| Clematis orientalis L. | 96 images |
| Clematis vitalba L. | 21089 images |
| Cleome dodecandra L. | 156 images |
| Cleomella lutea (Hook.) Roalson & J.C.Hall | 20 images |
| Cleomella parviflora A.Gray | 1 images |
| Cleomella platycarpa (Torr.) Roalson & J.C.Hall | 5 images |
| Cleomella serrulata (Pursh) Roalson & J.C.Hall | 106 images |
| Clinopodium glabellum (Michx.) Kuntze | 17 images |
| Clinopodium vulgare L. | 8778 images |
| Clintonia andrewsiana Torr. | 81 images |
| Clintonia uniflora (Menzies ex Schult. & Schult.f.) Kunth | 14 images |
| Cnidium monnieri (L.) Cusson | 1 images |
| Cochlearia groenlandica L. | 17 images |
| Colchicum autumnale L. | 6703 images |
| Coleanthus subtilis (Tratt.) Seidel ex Roem. & Schult. | 64 images |
| Coleogyne ramosissima Torr. | 50 images |
| Collinsia grandiflora Douglas ex Lindl. | 5 images |
| Collinsia linearis A.Gray | 1 images |
| Collinsia parviflora Douglas ex Lindl. | 50 images |
| Collinsia sparsiflora Fisch. & C.A.Mey. | 1 images |
| Collomia grandiflora Douglas ex Lindl. | 355 images |
| Collomia heterophylla Hook. | 12 images |
| Collomia linearis Nutt. | 40 images |
| Collomia mazama Coville | 2 images |
| Collomia tinctoria Kellogg | 5 images |
| Colutea arborescens L. | 3893 images |
| Comandra umbellata (L.) Nutt. | 103 images |
| Comarum palustre L. | 1202 images |
| Comastoma tenellum (Rottb.) Toyok. | 84 images |
| Commelina communis L. | 2482 images |
| Commelina dianthifolia Redouté | 16 images |
| Commelina erecta L. | 1958 images |
| Conioselinum scopulorum (A.Gray) J.M.Coult. & Rose | 20 images |
| Conium maculatum L. | 8338 images |
| Conopholis alpina Liebm. | 52 images |
| Conringia orientalis (L.) C.Presl | 4 images |
| Convallaria majalis L. | 7873 images |
| Convolvulus arvensis L. | 18610 images |
| Convolvulus equitans Benth. | 146 images |
| Corallorhiza maculata Raf. | 330 images |
| Corallorhiza mertensiana Bong. | 118 images |
| Corallorhiza striata Lindl. | 139 images |
| Corallorhiza trifida Châtel. | 203 images |
| Corallorhiza wisteriana Conrad | 34 images |
| Cordylanthus parviflorus (Ferris) Wiggins | 18 images |
| Coreopsis lanceolata L. | 3212 images |
| Coreopsis tinctoria Nutt. | 3600 images |
| Corethrogyne filaginifolia (Hook. & Arn.) Nutt. | 140 images |
| Coriandrum sativum L. | 3507 images |
| Corispermum americanum (Nutt.) Nutt. | 2 images |
| Corispermum hyssopifolium L. | 1 images |
| Cornus canadensis L. | 1577 images |
| Cornus glabrata Benth. | 9 images |
| Cornus nuttallii Audubon ex Torr. & A.Gray | 135 images |
| Cornus sanguinea L. | 31047 images |
| Cornus sericea L. | 8082 images |
| Cornus unalaschkensis Ledeb. | 9 images |
| Coronilla varia L. | 11078 images |
| Corrigiola litoralis L. | 394 images |
| Cortaderia jubata (Lemoine) Stapf | 1 images |
| Cortaderia selloana (Schult. & Schult.f.) Asch. & Graebn. | 4563 images |
| Corydalis aurea Willd. | 105 images |
| Corydalis caseana A.Gray | 20 images |
| Corydalis scouleri Hook. | 36 images |
| Corylus avellana L. | 22703 images |
| Corylus cornuta Marshall | 1905 images |
| Corynephorus canescens (L.) P.Beauv. | 446 images |
| Cosmos bipinnatus Cav. | 14803 images |
| Cosmos parviflorus (Jacq.) Pers. | 45 images |
| Cota tinctoria (L.) J.Gay | 2827 images |
| Cotoneaster acutifolius Turcz. | 989 images |
| Cotoneaster affinis Lindl. | 33 images |
| Cotoneaster apiculatus Rehder & E.H.Wilson | 3 images |
| Cotoneaster bullatus Bois | 1016 images |
| Cotoneaster conspicuus Comber ex C.Marquand | 2 images |
| Cotoneaster coriaceus Franch. | 6406 images |
| Cotoneaster dammeri C.K.Schneid. | 2526 images |
| Cotoneaster dielsianus E.Pritz. | 134 images |
| Cotoneaster divaricatus Rehder & E.H.Wilson | 688 images |
| Cotoneaster fangianus T.T.Yu | 6 images |
| Cotoneaster franchetii Bois | 4372 images |
| Cotoneaster frigidus Wall. ex Lindl. | 460 images |
| Cotoneaster glaucophyllus Franch. | 56 images |
| Cotoneaster hebephyllus Diels | 23 images |
| Cotoneaster hjelmqvistii Flinck & B.Hylmö | 90 images |
| Cotoneaster horizontalis Decne. | 6095 images |
| Cotoneaster integrifolius (Roxb.) G.Klotz | 111 images |
| Cotoneaster nitens Rehder & E.H.Wilson | 9 images |
| Cotoneaster pannosus Franch. | 1092 images |
| Cotoneaster rehderi Pojark. | 12 images |
| Cotoneaster salicifolius Franch. | 1824 images |
| Cotoneaster simonsii Baker | 89 images |
| Cotula australis Hook.f. | 249 images |
| Cotula coronopifolia L. | 552 images |
| Crambe maritima L. | 2239 images |
| Crassula aquatica (L.) Schönland | 9 images |
| Crassula connata (Ruiz & Pav.) A.Berger | 5 images |
| Crassula tillaea Lest.-Garl. | 565 images |
| Crataegus chrysocarpa Ashe | 12 images |
| Crataegus douglasii Lindl. | 489 images |
| Crataegus germanica (L.) Kuntze | 6757 images |
| Crataegus laevigata (Poir.) DC. | 14252 images |
| Crataegus macracantha Lodd. ex Loudon | 10 images |
| Crataegus monogyna Jacq. | 25710 images |
| Crataegus phaenopyrum (L.f.) Medik. | 241 images |
| Crataegus pruinosa (H.L.Wendl.) K.Koch | 9 images |
| Crataegus punctata Jacq. | 97 images |
| Crataegus succulenta Schrad. ex Link | 15 images |
| Crataegus viridis L. | 36 images |
| Crataegus wattiana Hemsl. & Lace | 1 images |
| Crepis acuminata Nutt. | 43 images |
| Crepis capillaris (L.) Wallr. | 10454 images |
| Crepis intermedia A.Gray | 3 images |
| Crepis modocensis Greene | 6 images |
| Crepis monticola Coville | 2 images |
| Crepis nicaeensis Balb. | 35 images |
| Crepis occidentalis Nutt. | 45 images |
| Crepis pleurocarpa A.Gray | 2 images |
| Crepis pulchra L. | 1138 images |
| Crepis setosa Haller f. | 2967 images |
| Crepis tectorum L. | 461 images |
| Crepis vesicaria L. | 3407 images |
| Cressa truxillensis Kunth | 21 images |
| Crocanthemum bicknellii (Fernald) Janch. | 3 images |
| Crocidium multicaule Hook. | 19 images |
| Croton setiger Hook. | 276 images |
| Cruciata pedemontana (Bellardi) Ehrend. | 133 images |
| Crupina vulgaris Pers. ex Cass. | 96 images |
| Cryptantha flaccida (Douglas ex Lehm.) Greene | 8 images |
| Cryptantha intermedia (A.Gray) Greene | 1 images |
| Cryptantha minima Rydb. | 9 images |
| Cryptantha pterocarya (Torr.) Greene | 40 images |
| Cryptogramma acrostichoides R.Br. | 1 images |
| Cucumis anguria L. | 204 images |
| Cucurbita foetidissima Kunth | 284 images |
| Cuscuta approximata Bab. | 43 images |
| Cuscuta californica Hook. & Arn. | 5 images |
| Cuscuta campestris Yunck. | 694 images |
| Cuscuta cephalanthi Engelm. | 4 images |
| Cuscuta denticulata Engelm. | 19 images |
| Cuscuta epithymum (L.) L. | 1251 images |
| Cuscuta gronovii Willd. ex Schult. | 4 images |
| Cuscuta indecora Choisy | 15 images |
| Cuscuta pentagona Engelm. | 12 images |
| Cuscuta subinclusa Durand & Hilg. | 8 images |
| Cuscuta suksdorfii Yunck. | 4 images |
| Cuscuta umbellata Kunth | 4 images |
| Cyanthillium cinereum (L.) H.Rob. | 810 images |
| Cyclachaena xanthiifolia (Nutt.) Fresen. | 125 images |
| Cyclamen hederifolium Aiton | 7240 images |
| Cyclospermum leptophyllum (Pers.) Sprague ex Britton & P.Wilson | 430 images |
| Cylindropuntia × viridiflora (Britton & Rose) F.M.Knuth | 1 images |
| Cylindropuntia imbricata (Haw.) F.M.Knuth | 541 images |
| Cylindropuntia whipplei (Engelm. & J.M.Bigelow) F.M.Knuth | 31 images |
| Cymbalaria muralis G.Gaertn., B.Mey. & Scherb. | 2250 images |
| Cymopterus alpinus A.Gray | 35 images |
| Cymopterus glomeratus (Nutt.) DC. | 3 images |
| Cymopterus hallii (A.Gray) B.L.Turner | 15 images |
| Cymopterus lemmonii (J.M.Coult. & Rose) Dorn | 78 images |
| Cymopterus longipes S.Watson | 13 images |
| Cymopterus nivalis S.Watson | 1 images |
| Cymopterus petraeus M.E.Jones | 15 images |
| Cymopterus purpureus S.Watson | 3 images |
| Cymopterus terebinthinus (Hook.) Torr. & A.Gray | 14 images |
| Cynanchum laeve (Michx.) Pers. | 233 images |
| Cynodon dactylon (L.) Pers. | 2810 images |
| Cynoglossum officinale L. | 3436 images |
| Cynosurus cristatus L. | 841 images |
| Cynosurus echinatus L. | 660 images |
| Cyperus aggregatus (Willd.) Endl. | 55 images |
| Cyperus bipartitus Torr. | 8 images |
| Cyperus difformis L. | 127 images |
| Cyperus eragrostis Lam. | 2759 images |
| Cyperus erythrorhizos Muhl. | 1 images |
| Cyperus esculentus L. | 960 images |
| Cyperus fuscus L. | 348 images |
| Cyperus iria L. | 56 images |
| Cyperus lupulinus (Biehler) Marcks | 2 images |
| Cyperus odoratus L. | 121 images |
| Cyperus squarrosus L. | 27 images |
| Cyperus strigosus L. | 378 images |
| Cyperus subsquarrosus (Muhl.) Bauters | 161 images |
| Cypripedium californicum A.Gray | 18 images |
| Cypripedium montanum Douglas ex Lindl. | 100 images |
| Cypripedium parviflorum Salisb. | 315 images |
| Cypripedium passerinum Richardson | 14 images |
| Cyrtomium falcatum (L.f.) C.Presl | 431 images |
| Cyrtomium fortunei J.Sm. | 458 images |
| Cystopteris fragilis (L.) Bernh. | 1267 images |
| Cystopteris montana (Lam.) Bernh. | 112 images |
| Cystopteris tenuis (Michx.) Desv. | 3 images |
| Cytisus multiflorus (L'Hér.) Sweet | 417 images |
| Cytisus scoparius (L.) Link | 12511 images |
| Cytisus striatus (Hill) Rothm. | 885 images |
| Dactylis glomerata L. | 11106 images |
| Dactyloctenium aegyptium (L.) Willd. | 431 images |
| Dactylorhiza viridis (L.) R.M.Bateman, Pridgeon & M.W.Chase | 919 images |
| Dalea candida Willd. | 18 images |
| Dalea cylindriceps Barneby | 8 images |
| Dalea formosa Torr. | 68 images |
| Dalea jamesii (Torr.) Torr. & A.Gray | 2 images |
| Dalea lanata Spreng. | 4 images |
| Dalea leporina (Aiton) Bullock | 28 images |
| Dalea multiflora (Nutt.) Shinners | 14 images |
| Dalea purpurea Vent. | 272 images |
| Dalea villosa (Nutt.) Spreng. | 3 images |
| Danthonia californica Bol. | 18 images |
| Danthonia decumbens (L.) DC. | 116 images |
| Danthonia intermedia Vasey | 6 images |
| Danthonia unispicata (Thurb.) Munro ex Macoun | 21 images |
| Daphne laureola L. | 4128 images |
| Daphne mezereum L. | 4634 images |
| Darlingtonia californica Torr. | 214 images |
| Darmera peltata (Torr. ex Benth.) Voss | 827 images |
| Dasiphora fruticosa (L.) Rydb. | 7421 images |
| Datura discolor Bernh. | 39 images |
| Datura quercifolia Kunth | 1 images |
| Datura stramonium L. | 15712 images |
| Datura wrightii Regel | 1448 images |
| Daucus carota L. | 27906 images |
| Daucus pusillus Michx. | 219 images |
| Delairea odorata Lem. | 749 images |
| Delphinium ajacis L. | 6682 images |
| Delphinium barbeyi (Huth) Huth | 16 images |
| Delphinium bicolor Nutt. | 9 images |
| Delphinium carolinianum Walter | 162 images |
| Delphinium depauperatum Nutt. | 9 images |
| Delphinium glareosum Greene | 5 images |
| Delphinium menziesii DC. | 59 images |
| Delphinium nudicaule Torr. & A.Gray | 2 images |
| Delphinium nuttallianum Pritz. ex Walp. | 176 images |
| Delphinium scaposum Greene | 21 images |
| Delphinium wootonii Rydb. | 5 images |
| Deschampsia bolanderi (Thurb.) Saarela | 1 images |
| Deschampsia cespitosa (L.) P.Beauv. | 605 images |
| Deschampsia elongata (Hook.) Munro | 3 images |
| Descurainia pinnata (Walter) Britton | 164 images |
| Descurainia sophia (L.) Webb ex Prantl | 819 images |
| Desmanthus illinoensis (Michx.) MacMill. ex B.L.Rob. & Fernald | 147 images |
| Dianthus armeria L. | 2705 images |
| Dianthus barbatus L. | 11643 images |
| Dianthus deltoides L. | 4479 images |
| Diaperia prolifera (Nutt. ex DC.) Nutt. | 1 images |
| Dicentra cucullaria (L.) Bernh. | 661 images |
| Dicentra formosa (Andrews) Walp. | 333 images |
| Dicentra uniflora Kellogg | 45 images |
| Dichanthelium scribnerianum (Nash) J.R.Thomas | 2 images |
| Dichelostemma congestum (Sm.) Kunth | 59 images |
| Dichelostemma ida-maia (Alph.Wood) Greene | 54 images |
| Dichelostemma multiflorum (Benth.) A.Heller | 55 images |
| Dichodon viscidum (M.Bieb.) Holub | 43 images |
| Dieteria canescens (Pursh) Nutt. | 80 images |
| Digitalis grandiflora Mill. | 2848 images |
| Digitalis purpurea L. | 22006 images |
| Digitaria californica (Benth.) Henrard | 4 images |
| Digitaria ischaemum (Schreb.) Muhl. | 53 images |
| Digitaria sanguinalis (L.) Scop. | 2608 images |
| Dimeresia howellii A.Gray | 6 images |
| Dimorphocarpa wislizeni (Engelm.) Rollins | 7 images |
| Dionaea muscipula J.Ellis | 1814 images |
| Diplachne fusca (L.) P.Beauv. ex Roem. & Schult. | 44 images |
| Diplacus aurantiacus (Curtis) Jeps. | 353 images |
| Diplotaxis muralis (L.) DC. | 936 images |
| Diplotaxis tenuifolia (L.) DC. | 6309 images |
| Dipsacus fullonum L. | 15177 images |
| Dipsacus laciniatus L. | 1083 images |
| Dipsacus sativus (L.) Honck. | 2849 images |
| Dipterostemon capitatus (Benth.) Rydb. | 475 images |
| Distichlis spicata (L.) Greene | 93 images |
| Doellingeria engelmannii (D.C.Eaton) Semple, Brouillet & G.A.Allen | 1 images |
| Doellingeria ledophylla (A.Gray) Semple, Brouillet & G.A.Allen | 43 images |
| Doellingeria tomentella (Greene) Semple, Brouillet & G.A.Allen | 1 images |
| Doronicum pardalianches L. | 2078 images |
| Doronicum plantagineum L. | 1105 images |
| Downingia elegans (Douglas ex Lindl.) Torr. | 6 images |
| Downingia insignis Greene | 15 images |
| Downingia montana Greene | 5 images |
| Downingia yina Applegate | 9 images |
| Draba crassifolia Graham | 1 images |
| Draba fladnizensis Wulfen | 12 images |
| Draba helleriana Greene | 8 images |
| Draba nemorosa L. | 84 images |
| Draba oligosperma Hook. | 6 images |
| Draba paysonii J.F.Macbr. | 5 images |
| Draba spectabilis Greene | 2 images |
| Draba verna L. | 2777 images |
| Dracocephalum parviflorum Nutt. | 39 images |
| Drosera × obovata Mert. & W.D.J.Koch | 39 images |
| Drosera anglica Huds. | 310 images |
| Drosera linearis Goldie | 17 images |
| Drosera rotundifolia L. | 1637 images |
| Dryas drummondii Richardson ex Hook. | 38 images |
| Drymocallis arguta (Pursh) Rydb. | 13 images |
| Dryopteris arguta (Kaulf.) Watt | 7 images |
| Dryopteris carthusiana (Vill.) H.P.Fuchs | 953 images |
| Dryopteris cristata (L.) A.Gray | 310 images |
| Dryopteris expansa (C.Presl) Fraser-Jenk. & Jermy | 123 images |
| Dryopteris filix-mas (L.) Schott | 7135 images |
| Dudleya farinosa (Lindl.) Britton & Rose | 16 images |
| Dulichium arundinaceum (L.) Britton | 49 images |
| Dysphania ambrosioides (L.) Mosyakin & Clemants | 1398 images |
| Dysphania atriplicifolia (Spreng.) G.Kadereit, Sukhor. & Uotila | 62 images |
| Dysphania botrys (L.) Mosyakin & Clemants | 135 images |
| Dysphania chilensis (Schrad.) Mosyakin & Clemants | 3 images |
| Dysphania incisa (Poir.) ined. | 1 images |
| Dysphania multifida (L.) Mosyakin & Clemants | 60 images |
| Dysphania pumilio (R.Br.) Mosyakin & Clemants | 299 images |
| Dyssodia papposa (Vent.) Hitchc. | 27 images |
| Eatonella nivea A.Gray | 6 images |
| Echinacea angustifolia DC. | 1864 images |
| Echinacea purpurea (L.) Moench | 7435 images |
| Echinocereus coccineus Engelm. | 1158 images |
| Echinocereus fendleri (Engelm.) Sencke ex Haage | 10 images |
| Echinocereus reichenbachii (Terscheck) Haage | 29 images |
| Echinocereus triglochidiatus Engelm. | 363 images |
| Echinocereus viridiflorus Engelm. | 98 images |
| Echinochloa colonum (L.) Link | 237 images |
| Echinochloa crus-galli (L.) P.Beauv. | 3165 images |
| Echinochloa frumentacea Link | 17 images |
| Echinochloa muricata (P.Beauv.) Fernald | 51 images |
| Echinocystis lobata (Michx.) Torr. & A.Gray | 915 images |
| Echinops exaltatus Schrad. | 263 images |
| Echinops ritro L. | 5261 images |
| Echinops sphaerocephalus L. | 3457 images |
| Echium plantagineum L. | 7936 images |
| Echium vulgare L. | 36318 images |
| Elaeagnus angustifolia L. | 5414 images |
| Elaeagnus commutata Bernh. ex Rydb. | 259 images |
| Elaeagnus umbellata Thunb. | 2853 images |
| Elatine rubella Rydb. | 6 images |
| Elatine triandra Schkuhr | 43 images |
| Eleocharis acicularis (L.) Roem. & Schult. | 60 images |
| Eleocharis atropurpurea (Retz.) J.Presl & C.Presl | 4 images |
| Eleocharis compressa Sull. | 16 images |
| Eleocharis erythropoda Steud. | 7 images |
| Eleocharis flavescens (Poir.) Urb. | 8 images |
| Eleocharis macrostachya Britton | 11 images |
| Eleocharis mamillata (H.Lindb.) H.Lindb. | 1 images |
| Eleocharis obtusa (Willd.) Schult. | 40 images |
| Eleocharis ovata (Roth) Roem. & Schult. | 45 images |
| Eleocharis palustris (L.) Roem. & Schult. | 724 images |
| Eleocharis parvula (Roem. & Schult.) Link ex Bluff, Nees & Schauer | 41 images |
| Eleocharis quinqueflora (Hartmann) O.Schwarz | 55 images |
| Eleocharis uniglumis (Link) Schult. | 30 images |
| Eleusine indica (L.) Gaertn. | 993 images |
| Eleusine tristachya (Lam.) Lam. | 161 images |
| Elliottia pyroliflora (Bong.) S.W.Brim & P.F.Stevens | 2 images |
| Ellisia nyctelea (L.) L. | 58 images |
| Elodea canadensis Michx. | 286 images |
| Elodea densa (Planch.) Casp. | 124 images |
| Elodea nuttallii (Planch.) H.St.John | 96 images |
| Elymus canadensis L. | 150 images |
| Elymus caninus (L.) L. | 207 images |
| Elymus elymoides (Raf.) Swezey | 21 images |
| Elymus glaucus Buckley | 13 images |
| Elymus repens (L.) Gould | 718 images |
| Elymus villosus Muhl. ex Willd. | 7 images |
| Elymus violaceus (Hornem.) J.Feilberg | 8 images |
| Elymus virginicus L. | 63 images |
| Empetrum nigrum L. | 1431 images |
| Enceliopsis nudicaulis A.Nelson | 8 images |
| Enemion stipitatum (A.Gray) J.R.Drumm. & Hutch. | 1 images |
| Engelmannia peristenia (Raf.) Goodman & C.A.Lawson | 18 images |
| Enneapogon desvauxii P.Beauv. | 18 images |
| Ephedra viridis Coville | 125 images |
| Epilobium anagallidifolium Lam. | 205 images |
| Epilobium angustifolium L. | 19614 images |
| Epilobium brachycarpum C.Presl | 302 images |
| Epilobium canum (Greene) P.H.Raven | 349 images |
| Epilobium ciliatum Raf. | 4669 images |
| Epilobium clavatum Trel. | 2 images |
| Epilobium glaberrimum Barbey | 13 images |
| Epilobium hallianum Hausskn. | 1 images |
| Epilobium hirsutum L. | 15168 images |
| Epilobium hornemannii Rchb. | 25 images |
| Epilobium lactiflorum Hausskn. | 18 images |
| Epilobium latifolium L. | 109 images |
| Epilobium leptophyllum Raf. | 9 images |
| Epilobium luteum Pursh | 27 images |
| Epilobium minutum Lindl. ex Lehm. | 13 images |
| Epilobium mirabile Trel. ex Piper | 3 images |
| Epilobium obcordatum A.Gray | 1 images |
| Epilobium obscurum Schreb. | 75 images |
| Epilobium oreganum Greene | 16 images |
| Epilobium oregonense Hausskn. | 4 images |
| Epilobium palustre L. | 509 images |
| Epilobium parviflorum Schreb. | 4762 images |
| Epilobium rigidum Hausskn. | 4 images |
| Epilobium suffruticosum Nutt. | 3 images |
| Epipactis gigantea Douglas | 174 images |
| Epipactis helleborine (L.) Crantz | 7268 images |
| Equisetum × ferrissii Clute | 3 images |
| Equisetum × litorale Kühlew. ex Rupr. | 16 images |
| Equisetum arvense L. | 6594 images |
| Equisetum fluviatile L. | 888 images |
| Equisetum laevigatum A.Braun & Engelm. | 77 images |
| Equisetum palustre L. | 1029 images |
| Equisetum pratense Ehrh. | 441 images |
| Equisetum scirpoides Michx. | 80 images |
| Equisetum sylvaticum L. | 2601 images |
| Equisetum variegatum Schleich. ex F.Weber & D.Mohr | 109 images |
| Eragrostis barrelieri Daveau | 68 images |
| Eragrostis cilianensis (All.) Vignolo ex Janch. | 179 images |
| Eragrostis curvula (Schrad.) Nees | 78 images |
| Eragrostis hypnoides (Lam.) Britton, Sterns & Poggenb. | 5 images |
| Eragrostis mexicana (Hornem.) Link | 28 images |
| Eragrostis minor Host | 329 images |
| Eragrostis pectinacea (Michx.) Nees | 28 images |
| Eragrostis pilosa (L.) P.Beauv. | 63 images |
| Eragrostis secundiflora J.Presl | 1 images |
| Eragrostis spectabilis (Pursh) Steud. | 202 images |
| Erechtites hieraciifolius (L.) Raf. ex DC. | 1960 images |
| Eremogone capillaris (Poir.) Fenzl | 7 images |
| Eremopyrum triticeum (Gaertn.) Nevski | 10 images |
| Eremothera boothii (Douglas) W.L.Wagner & Hoch | 1 images |
| Eriastrum signatum D.Gowen | 10 images |
| Erica lusitanica Rudolphi | 371 images |
| Erigeron aliceae Howell | 14 images |
| Erigeron annuus (L.) Desf | 774 images |
| Erigeron aureus Greene | 12 images |
| Erigeron bonariensis L. | 2654 images |
| Erigeron caespitosus Nutt. | 5 images |
| Erigeron canadensis L. | 15030 images |
| Erigeron compositus Pursh | 38 images |
| Erigeron coulteri Porter & J.M.Coult. | 68 images |
| Erigeron decumbens Nutt. | 3 images |
| Erigeron divergens Torr. & A.Gray | 9 images |
| Erigeron elegantulus Greene | 25 images |
| Erigeron flagellaris A.Gray | 2 images |
| Erigeron flettii G.N.Jones | 2 images |
| Erigeron foliosus Nutt. | 180 images |
| Erigeron formosissimus Greene | 6 images |
| Erigeron glabellus Nutt. | 117 images |
| Erigeron glaucus Ker Gawl. | 1225 images |
| Erigeron grandiflorus Hook. | 1 images |
| Erigeron humilis Graham | 6 images |
| Erigeron linearis (Hook.) Piper | 34 images |
| Erigeron lonchophyllus Hook. | 13 images |
| Erigeron nanus Nutt. | 1 images |
| Erigeron peregrinus Greene | 50 images |
| Erigeron petrophilus Greene | 19 images |
| Erigeron philadelphicus L. | 3508 images |
| Erigeron poliospermus A.Gray | 4 images |
| Erigeron pumilus Nutt. | 80 images |
| Erigeron speciosus (Lindl.) DC. | 1192 images |
| Erigeron strigosus Muhl. ex Willd. | 5938 images |
| Erigeron vagus Payson | 19 images |
| Erigeron vetensis Rydb. | 5 images |
| Eriochloa villosa (Thunb.) Kunth | 6 images |
| Eriocoma hymenoides (Roem. & Schult.) Rydb. | 1 images |
| Eriocoma nelsonii (Scribn.) Romasch. | 1 images |
| Eriodictyon californicum (Hook. & Arn.) Decne. | 1 images |
| Eriogonum alatum Torr. | 9 images |
| Eriogonum annuum Nutt. | 19 images |
| Eriogonum baileyi S.Watson | 1 images |
| Eriogonum brachyanthum Coville | 2 images |
| Eriogonum brevicaule Nutt. | 2 images |
| Eriogonum caespitosum Nutt. | 39 images |
| Eriogonum cernuum Nutt. | 12 images |
| Eriogonum compositum Douglas ex Benth. | 28 images |
| Eriogonum corymbosum Benth. | 8 images |
| Eriogonum crosbyae Reveal | 6 images |
| Eriogonum diclinum Reveal | 6 images |
| Eriogonum douglasii Benth. | 25 images |
| Eriogonum elatum Douglas ex Benth. | 31 images |
| Eriogonum flavum Nutt. ex Benth. | 11 images |
| Eriogonum heracleoides Nutt. | 118 images |
| Eriogonum inflatum Torr. | 38 images |
| Eriogonum jamesii Benth. | 12 images |
| Eriogonum lachnogynum Torr. ex Benth. | 6 images |
| Eriogonum latifolium Sm. | 187 images |
| Eriogonum leptophyllum (Torr.) Wooton & Standl. | 1 images |
| Eriogonum lobbii Torr. & A.Gray | 23 images |
| Eriogonum luteolum Greene | 21 images |
| Eriogonum maculatum A.Heller | 42 images |
| Eriogonum microtheca Nutt. | 24 images |
| Eriogonum nidularium Coville | 24 images |
| Eriogonum nudum Douglas ex Benth. | 81 images |
| Eriogonum ovalifolium Nutt. | 157 images |
| Eriogonum pendulum S.Watson | 6 images |
| Eriogonum prociduum Reveal | 5 images |
| Eriogonum pyrolifolium Hook. | 46 images |
| Eriogonum racemosum Nutt. | 14 images |
| Eriogonum roseum Durand & Hilg. | 15 images |
| Eriogonum shockleyi S.Watson | 7 images |
| Eriogonum spergulinum A.Gray | 5 images |
| Eriogonum sphaerocephalum Douglas ex Benth. | 22 images |
| Eriogonum strictum Benth. | 41 images |
| Eriogonum tenellum Torr. | 4 images |
| Eriogonum thymoides Benth. | 22 images |
| Eriogonum umbellatum Torr. | 421 images |
| Eriogonum vimineum Douglas ex Benth. | 22 images |
| Erioneuron pilosum (Buckley) Nash | 10 images |
| Eriophorum angustifolium Honck. | 2602 images |
| Eriophorum chamissonis C.A.Mey. | 1 images |
| Eriophorum scheuchzeri Hoppe | 1042 images |
| Eriophorum viridicarinatum (Engelm.) Fernald | 2 images |
| Eriophyllum lanatum (Pursh) J.Forbes | 75 images |
| Eriophyllum staechadifolium Lag. | 34 images |
| Erodium botrys (Cav.) Bertol. | 566 images |
| Erodium brachycarpum (Godr.) Thell. | 14 images |
| Erodium cicutarium (L.) L'Hér. | 13374 images |
| Erodium moschatum (L.) L'Hér. | 4645 images |
| Erodium salzmannii Delile | 1 images |
| Eruca vesicaria (L.) Cav. | 4195 images |
| Erucastrum gallicum (Willd.) O.E.Schulz | 329 images |
| Eryngium planum L. | 2334 images |
| Erysimum asperum (Nutt.) DC. | 116 images |
| Erysimum capitatum (Douglas) Greene | 15 images |
| Erysimum cheiranthoides L. | 1238 images |
| Erysimum perenne (S.Watson ex Coville) Abrams | 1 images |
| Erysimum repandum L. | 54 images |
| Erysimum virgatum Roth | 120 images |
| Erythranthe alsinoides (Douglas ex Benth.) G.L.Nesom & N.S.Fraga | 1 images |
| Erythranthe cardinalis (Douglas ex Benth.) Spach | 189 images |
| Erythranthe floribunda (Lindl.) G.L.Nesom | 9 images |
| Erythranthe grandis (Greene) G.L.Nesom | 1 images |
| Erythranthe guttata (DC.) G.L.Nesom | 897 images |
| Erythranthe jungermannioides (Suksd.) G.L.Nesom | 5 images |
| Erythranthe lewisii (Pursh) G.L.Nesom & N.S.Fraga | 51 images |
| Erythranthe moschata (Douglas ex Lindl.) G.L.Nesom | 15 images |
| Erythranthe nasuta (Greene) G.L.Nesom | 1 images |
| Erythranthe primuloides (Benth.) G.L.Nesom & N.S.Fraga | 1 images |
| Erythranthe tilingii (Regel) G.L.Nesom | 6 images |
| Erythronium citrinum S.Watson | 9 images |
| Erythronium grandiflorum Pursh | 160 images |
| Erythronium hendersonii S.Watson | 32 images |
| Erythronium howellii S.Watson | 7 images |
| Erythronium klamathense Applegate | 7 images |
| Erythronium montanum S.Watson | 62 images |
| Erythronium oregonum Applegate | 134 images |
| Erythronium revolutum Sm. | 117 images |
| Eschscholzia caespitosa Benth. | 372 images |
| Eschscholzia californica Cham. | 14984 images |
| Escobaria missouriensis (Sweet) D.R.Hunt | 18 images |
| Escobaria vivipara (Nutt.) Buxb. | 93 images |
| Euchiton japonicus (Thunb.) Holub | 1 images |
| Euclidium syriacum (L.) W.T.Aiton | 3 images |
| Euonymus alatus (Thunb.) Siebold | 3519 images |
| Euonymus atropurpureus Jacq. | 122 images |
| Euonymus occidentalis Nutt. ex Torr. | 29 images |
| Euphorbia agraria M.Bieb. | 7 images |
| Euphorbia albomarginata Torr. & A.Gray | 35 images |
| Euphorbia cyparissias L. | 16820 images |
| Euphorbia davidii Subils | 55 images |
| Euphorbia esula L. | 2220 images |
| Euphorbia glyptosperma Engelm. | 36 images |
| Euphorbia helioscopia L. | 8915 images |
| Euphorbia lathyris L. | 9581 images |
| Euphorbia maculata L. | 946 images |
| Euphorbia marginata Pursh | 1601 images |
| Euphorbia myrsinites L. | 2302 images |
| Euphorbia nutans Lag. | 418 images |
| Euphorbia oblongata Griseb. | 1 images |
| Euphorbia parryi Engelm. | 2 images |
| Euphorbia peplus L. | 7238 images |
| Euphorbia platyphyllos L. | 598 images |
| Euphorbia prostrata Aiton | 2256 images |
| Euphorbia saratoi Ardoino | 1 images |
| Euphorbia serpens Kunth | 584 images |
| Euphorbia serpillifolia Pers. | 8 images |
| Euphorbia virgata Waldst. & Kit. | 32 images |
| Euphrasia nemorosa (Pers.) Wallr. | 412 images |
| Euphrosyne acerosa (Nutt.) Panero | 3 images |
| Euploca convolvulacea Nutt. | 4 images |
| Eurybia conspicua (Lindl.) G.L.Nesom | 11 images |
| Eurybia glauca (Nutt.) G.L.Nesom | 2 images |
| Eurybia sibirica (L.) G.L.Nesom | 4 images |
| Eustoma exaltatum (L.) Salisb. ex G.Don | 72 images |
| Eustoma russellianum (Hook.) G.Don | 1887 images |
| Euthamia graminifolia (L.) Nutt. | 859 images |
| Euthamia gymnospermoides Greene | 16 images |
| Euthamia occidentalis Nutt. | 47 images |
| Eutrochium maculatum (L.) E.E.Lamont | 1715 images |
| Fagopyrum esculentum Moench | 6605 images |
| Falcaria vulgaris Bernh. | 1121 images |
| Fallopia baldschuanica (Regel) Holub | 1422 images |
| Fallopia convolvulus (L.) Á.Löve | 1644 images |
| Fallopia scandens (L.) Holub | 28 images |
| Fallugia paradoxa (D.Don ex Tilloch & Taylor) Endl. ex Torr. | 45 images |
| Festuca arizonica Vasey | 3 images |
| Festuca bromoides L. | 216 images |
| Festuca californica Vasey | 14 images |
| Festuca filiformis Pourr. | 187 images |
| Festuca idahoensis Elmer | 4 images |
| Festuca microstachys Nutt. | 18 images |
| Festuca myuros L. | 344 images |
| Festuca occidentalis Hook. | 7 images |
| Festuca octoflora Walter | 10 images |
| Festuca ovina L. | 253 images |
| Festuca rubra L. | 411 images |
| Festuca trachyphylla (Hack.) Hack. | 20 images |
| Festuca valesiaca Schleich. ex Gaudin | 31 images |
| Festuca viridula Vasey | 1 images |
| Festuca viviparoidea Krajina ex Pavlick | 6 images |
| Filago arvensis L. | 226 images |
| Filago germanica (L.) Huds. | 234 images |
| Filipendula ulmaria (L.) Maxim. | 14068 images |
| Floerkea proserpinacoides Willd. | 46 images |
| Foeniculum vulgare Mill. | 12057 images |
| Forestiera pubescens Nutt. | 105 images |
| Forsythia suspensa (Thunb.) Vahl | 5090 images |
| Fragaria × ananassa (Duchesne ex Weston) Duchesne ex Rozier | 4517 images |
| Fragaria chiloensis (L.) Mill. | 363 images |
| Fragaria vesca L. | 12193 images |
| Fragaria virginiana Mill. | 460 images |
| Frangula alnus Mill. | 6941 images |
| Frangula californica (Eschsch.) A.Gray | 68 images |
| Frangula purshiana (DC.) A.Gray ex J.G.Cooper | 24 images |
| Frangula rubra (Greene) Grubov | 1 images |
| Frankenia pulverulenta L. | 150 images |
| Frasera albicaulis Griseb. | 6 images |
| Frasera speciosa Douglas ex Griseb. | 59 images |
| Fraxinus americana L. | 5386 images |
| Fraxinus anomala Torr. ex S.Watson | 11 images |
| Fraxinus latifolia Benth. | 228 images |
| Fraxinus pennsylvanica Marshall | 1846 images |
| Fritillaria affinis (Schult. & Schult.f.) Sealy | 21 images |
| Fritillaria atropurpurea Nutt. | 82 images |
| Fritillaria camschatcensis (L.) Ker Gawl. | 45 images |
| Fritillaria gentneri Gilkey | 39 images |
| Fritillaria glauca Greene | 4 images |
| Fritillaria pudica (Pursh) Spreng. | 56 images |
| Fritillaria purdyi Eastw. | 16 images |
| Fritillaria recurva Benth. | 51 images |
| Froelichia floridana (Nutt.) Moq. | 60 images |
| Froelichia gracilis (Hook.) Moq. | 35 images |
| Fuchsia magellanica Lam. | 11171 images |
| Fumaria officinalis L. | 7787 images |
| Fumaria vaillantii Loisel. | 287 images |
| Funastrum crispum (Benth.) Schltr. | 3 images |
| Gagea serotina (L.) Ker Gawl. | 130 images |
| Gaillardia aristata Pursh | 3053 images |
| Gaillardia pinnatifida Torr. | 77 images |
| Gaillardia pulchella Foug. | 3598 images |
| Gaillardia spathulata A.Gray | 5 images |
| Galanthus nivalis L. | 5064 images |
| Galearis rotundifolia (Banks ex Pursh) R.M.Bateman | 6 images |
| Galega officinalis L. | 2804 images |
| Galeopsis bifida Boenn. | 719 images |
| Galeopsis ladanum L. | 781 images |
| Galeopsis tetrahit L. | 10111 images |
| Galinsoga parviflora Cav. | 3599 images |
| Galinsoga quadriradiata Ruiz & Pav. | 4541 images |
| Galium aparine L. | 13547 images |
| Galium boreale L. | 1099 images |
| Galium kamtschaticum Steller ex Schult. & Schult.f. | 3 images |
| Galium mexicanum Kunth | 3 images |
| Galium odoratum (L.) Scop. | 7720 images |
| Galium oreganum Britton | 4 images |
| Galium palustre L. | 1926 images |
| Galium parisiense L. | 195 images |
| Galium porrigens Dempster | 48 images |
| Galium serpenticum Dempster | 8 images |
| Galium tinctorium L. | 1 images |
| Galium trifidum L. | 42 images |
| Galium triflorum Michx. | 251 images |
| Galium verum L. | 11708 images |
| Garrya elliptica Douglas ex Lindl. | 698 images |
| Garrya fremontii Torr. | 38 images |
| Gaultheria hispidula (L.) Muhl. ex Bigelow | 82 images |
| Gaultheria humifusa (Graham) Rydb. | 25 images |
| Gaultheria shallon Pursh | 1015 images |
| Gayophytum humile Juss. | 10 images |
| Genista canariensis L. | 166 images |
| Genista monspessulana (L.) L.A.S.Johnson | 1218 images |
| Gentiana affinis Griseb. | 40 images |
| Gentiana algida Pall. | 23 images |
| Gentiana andrewsii Griseb. | 159 images |
| Gentiana calycosa Griseb. | 149 images |
| Gentiana douglasiana Bong. | 16 images |
| Gentiana fremontii Torr. | 5 images |
| Gentiana glauca Pall. | 6 images |
| Gentiana newberryi A.Gray | 2 images |
| Gentiana parryi Engelm. | 24 images |
| Gentiana prostrata Haenke | 11 images |
| Gentiana sceptrum Griseb. | 5 images |
| Gentianella amarella (L.) Börner | 174 images |
| Gentianopsis thermalis (Kuntze) Iltis | 10 images |
| Gentianopsis virgata (Raf.) Holub | 14 images |
| Geocaulon lividum (Richardson) Fernald | 14 images |
| Geranium bicknellii Britton | 35 images |
| Geranium carolinianum L. | 1360 images |
| Geranium columbinum L. | 1469 images |
| Geranium dissectum L. | 6418 images |
| Geranium lucidum L. | 2693 images |
| Geranium molle L. | 8986 images |
| Geranium oreganum Howell | 16 images |
| Geranium pusillum L. | 9303 images |
| Geranium richardsonii Fisch. & Trautv. | 30 images |
| Geranium robertianum L. | 24165 images |
| Geranium rotundifolium L. | 4732 images |
| Geranium viscosissimum Fisch. & C.A.Mey. | 121 images |
| Geum aleppicum Jacq. | 288 images |
| Geum canadense Jacq. | 113 images |
| Geum macrophyllum Willd. | 4124 images |
| Geum rivale L. | 4132 images |
| Geum rossii (R.Br.) Ser. | 31 images |
| Geum triflorum Pursh | 111 images |
| Geum urbanum L. | 15637 images |
| Gilia capitata Sims | 579 images |
| Gilia inconspicua (Sm.) Sweet | 2 images |
| Gilia ophthalmoides Brand | 5 images |
| Gilia sinuata Douglas ex Benth. | 23 images |
| Githopsis specularioides Nutt. | 3 images |
| Glaucium corniculatum (L.) Curtis | 125 images |
| Glaucium flavum Crantz | 5830 images |
| Glebionis segetum (L.) Fourr. | 5191 images |
| Glechoma hederacea L. | 27073 images |
| Gleditsia triacanthos L. | 12256 images |
| Glehnia littoralis (A.Gray) F.Schmidt ex Miq. | 1 images |
| Glyceria canadensis (Michx.) Trin. | 17 images |
| Glyceria fluitans (L.) R.Br. | 220 images |
| Glyceria grandis S.Watson | 1 images |
| Glyceria leptostachya Buckley | 4 images |
| Glyceria striata (Lam.) Hitchc. | 49 images |
| Glycyrrhiza lepidota Pursh | 86 images |
| Glyptopleura marginata D.C.Eaton | 12 images |
| Gnaphalium exilifolium A.Nelson | 7 images |
| Gnaphalium palustre Nutt. | 37 images |
| Gnaphalium uliginosum L. | 1282 images |
| Goodyera oblongifolia Raf. | 208 images |
| Goodyera repens (L.) R.Br. | 395 images |
| Gratiola neglecta Torr. | 20 images |
| Grayia spinosa (Hook.) Moq. | 58 images |
| Grindelia arizonica A.Gray | 3 images |
| Grindelia ciliata (Nutt.) Spreng. | 11 images |
| Grindelia hirsutula Hook. & Arn. | 122 images |
| Grindelia integrifolia DC. | 117 images |
| Grindelia lanceolata Nutt. | 43 images |
| Grindelia nuda Alph.Wood | 2 images |
| Grindelia squarrosa (Pursh) Dunal | 358 images |
| Grindelia subalpina Greene | 8 images |
| Guilleminea densa (Willd. ex Schult.) Moq. | 41 images |
| Gunnera tinctoria (Molina) Mirb. | 3456 images |
| Gutierrezia microcephala (DC.) A.Gray | 27 images |
| Gutierrezia sarothrae (Pursh) Britton & Rusby | 91 images |
| Gymnocarpium disjunctum (Rupr.) Ching | 4 images |
| Gymnocarpium dryopteris (L.) Newman | 754 images |
| Gypsophila acutifolia Steven ex Spreng. | 13 images |
| Gypsophila elegans M.Bieb. | 1329 images |
| Gypsophila paniculata L. | 1411 images |
| Gypsophila scorzonerifolia Ser. | 7 images |
| Gypsophila vaccaria (L.) Sm. | 1588 images |
| Hackelia bella (J.F.Macbr.) I.M.Johnst. | 11 images |
| Hackelia californica (A.Gray) I.M.Johnst. | 6 images |
| Hackelia cusickii (Piper) Brand | 2 images |
| Hackelia deflexa (Wahlenb.) Opiz | 21 images |
| Hackelia floribunda (Lehm.) I.M.Johnst. | 21 images |
| Hackelia mundula (Jeps.) Ferris | 3 images |
| Hackelia patens (Nutt.) I.M.Johnst. | 2 images |
| Halerpestes cymbalaria (Pursh) Greene | 19 images |
| Halogeton glomeratus (M.Bieb.) Ledeb. | 7 images |
| Haploesthes greggii A.Gray | 2 images |
| Hastingsia alba (Durand) S.Watson | 12 images |
| Hastingsia bracteosa S.Watson | 3 images |
| Hastingsia serpentinicola Becking | 2 images |
| Hazardia whitneyi Greene | 7 images |
| Hedeoma drummondii Benth. | 7 images |
| Hedeoma hispida Pursh | 4 images |
| Hedera helix L. | 24624 images |
| Hedera hibernica Poit. | 151 images |
| Hedlundia hybrida (L.) Sennikov & Kurtto | 57 images |
| Hedysarum alpinum L. | 11 images |
| Hedysarum boreale Nutt. | 15 images |
| Hedysarum occidentale Greene | 2 images |
| Hedysarum sulphurescens Rydb. | 5 images |
| Helenium autumnale L. | 1847 images |
| Helenium bigelovii A.Gray | 69 images |
| Helenium bolanderi A.Gray | 6 images |
| Helianthella californica A.Gray | 19 images |
| Helianthella quinquenervis (Hook.) A.Gray | 3 images |
| Helianthus × laetiflorus Pers. | 2384 images |
| Helianthus annuus L. | 16202 images |
| Helianthus bolanderi A.Gray | 14 images |
| Helianthus ciliaris DC. | 18 images |
| Helianthus grosseserratus M.Martens | 57 images |
| Helianthus maximiliani Schrad. | 550 images |
| Helianthus nuttallii Torr. & A.Gray | 12 images |
| Helianthus pauciflorus Nutt. | 199 images |
| Helianthus petiolaris Nutt. | 778 images |
| Helianthus pumilus Nutt. | 16 images |
| Helianthus tuberosus L. | 8621 images |
| Heliomeris multiflora Nutt. | 60 images |
| Heliopsis helianthoides (L.) Sweet | 2877 images |
| Heliotropium curassavicum L. | 693 images |
| Helminthotheca echioides (L.) Holub | 8427 images |
| Hemerocallis fulva (L.) L. | 11440 images |
| Hemieva ranunculifolia Raf. | 2 images |
| Hemionitis andromedifolia (Kaulf.) Christenh. | 2 images |
| Hemionitis atropurpurea (L.) Christenh. | 49 images |
| Hemionitis brachyptera (T.Moore) Christenh. | 4 images |
| Hemionitis breweri (Eat.Pr.) Christenh. | 1 images |
| Hemionitis bridgesii (Hook.) Christenh. | 20 images |
| Hemionitis cochisensis (Goodd.) Christenh. | 1 images |
| Hemionitis densa (Brack.) Christenh. | 66 images |
| Hemionitis eatonii (Baker) Christenh. | 2 images |
| Hemionitis feei (T.Moore) Christenh. | 2 images |
| Hemionitis integerrima (Hook.) Christenh. | 1 images |
| Hemionitis intertexta (Maxon) Christenh. | 3 images |
| Hemionitis triangularis (Kaulf.) Christenh. | 2 images |
| Hemionitis wrightiana (Hook.) Christenh. | 2 images |
| Hemitomes congestum A.Gray | 31 images |
| Hemizonella minima A.Gray | 23 images |
| Hemizonia congesta DC. | 99 images |
| Heracleum mantegazzianum Sommier & Levier | 3161 images |
| Heracleum maximum W.Bartram | 772 images |
| Heracleum sibiricum L. | 3930 images |
| Herniaria cinerea DC. | 30 images |
| Herniaria glabra L. | 787 images |
| Hesperevax acaulis (Kellogg) Greene | 8 images |
| Hesperis matronalis L. | 8841 images |
| Hesperochiron californicus (Benth.) S.Watson | 23 images |
| Hesperochiron pumilus (Griseb.) Porter | 11 images |
| Hesperocyparis bakeri (Jeps.) Bartel | 17 images |
| Heteranthera dubia (Jacq.) MacMill. | 24 images |
| Heteranthera limosa (Sw.) Willd. | 49 images |
| Heterotheca canescens (DC.) Shinners | 19 images |
| Heterotheca cinerascens (S.F.Blake) G.L.Nesom | 4 images |
| Heterotheca oregona (Nutt.) Shinners | 13 images |
| Heterotheca pumila (Greene) Semple | 8 images |
| Heterotheca subaxillaris (Lam.) Britton & Rusby | 324 images |
| Heterotheca villosa (Pursh) Shinners | 188 images |
| Heuchera bracteata (Torr.) Ser. | 2 images |
| Heuchera chlorantha Piper | 2 images |
| Heuchera cylindrica Douglas | 25 images |
| Heuchera merriamii Eastw. | 11 images |
| Heuchera micrantha Douglas | 1 images |
| Heuchera parvifolia Nutt. | 5 images |
| Heuchera richardsonii R.Br. | 51 images |
| Heuchera rubescens Torr. | 93 images |
| Hexasepalum teres (Walter) J.H.Kirkbr. | 124 images |
| Hibiscus trionum L. | 1238 images |
| Hieracium albiflorum Hook. | 193 images |
| Hieracium fendleri Sch.Bip. | 1 images |
| Hieracium horridum Fr. | 44 images |
| Hieracium lachenalii Suter | 615 images |
| Hieracium scouleri Hook. | 20 images |
| Hieracium triste Willd. ex Spreng. | 18 images |
| Hieracium umbellatum L. | 2298 images |
| Hippuris vulgaris L. | 561 images |
| Hirschfeldia incana (L.) Lagr.-Foss. | 2490 images |
| Hoffmannseggia glauca (Ortega) Eifert | 108 images |
| Hoffmannseggia repens (Eastw.) Cockerell | 2 images |
| Holcus lanatus L. | 6603 images |
| Holcus mollis L. | 219 images |
| Holodiscus discolor (Pursh) Maxim. | 740 images |
| Holosteum umbellatum L. | 147 images |
| Honckenya peploides (L.) Ehrh. | 1527 images |
| Hopia obtusa (Kunth) Zuloaga & Morrone | 1 images |
| Hordeum brachyantherum Nevski | 21 images |
| Hordeum jubatum L. | 566 images |
| Hordeum marinum Huds. | 315 images |
| Hordeum murinum L. | 7521 images |
| Hordeum pusillum Nutt. | 57 images |
| Hordeum vulgare L. | 8995 images |
| Hornungia procumbens (L.) Hayek | 102 images |
| Hosackia crassifolia Benth. | 7 images |
| Hosackia gracilis Benth. | 15 images |
| Hosackia oblongifolia Benth. | 10 images |
| Hosackia stipularis Benth. | 5 images |
| Humulus lupulus L. | 10952 images |
| Hyacinthoides hispanica (Mill.) Rothm. | 5050 images |
| Hyacinthoides non-scripta (L.) Chouard ex Rothm. | 10620 images |
| Hydrilla verticillata (L.f.) Royle | 6 images |
| Hydrocotyle ranunculoides L.f. | 248 images |
| Hydrocotyle umbellata L. | 63 images |
| Hydrocotyle verticillata Thunb. | 674 images |
| Hydrophyllum capitatum Douglas ex Benth. | 115 images |
| Hydrophyllum fendleri (A.Gray) A.Heller | 24 images |
| Hydrophyllum occidentale (S.Watson) A.Gray | 44 images |
| Hydrophyllum tenuipes A.Heller | 16 images |
| Hylotelephium telephium (L.) H.Ohba | 8768 images |
| Hymenopappus filifolius Hook. | 55 images |
| Hymenopappus tenuifolius Pursh | 8 images |
| Hymenoxys cooperi Cockerell | 15 images |
| Hymenoxys grandiflora (Torr. & A.Gray) K.F.Parker | 2 images |
| Hymenoxys hoopesii (A.Gray) Bierner | 57 images |
| Hymenoxys odorata DC. | 14 images |
| Hymenoxys richardsonii (Hook.) Cockerell | 6 images |
| Hyoscyamus niger L. | 1562 images |
| Hypericum canadense L. | 10 images |
| Hypericum ellipticum Hook. | 13 images |
| Hypericum fraseri (Spach) Steud. | 48 images |
| Hypericum maculatum Crantz | 5048 images |
| Hypericum majus (A.Gray) Britton | 6 images |
| Hypericum mutilum L. | 120 images |
| Hypericum perforatum L. | 17797 images |
| Hypericum scouleri Hook. | 44 images |
| Hypochaeris glabra L. | 2978 images |
| Hypochaeris radicata L. | 10546 images |
| Hypoxis hirsuta (L.) Coville | 326 images |
| Iberis amara L. | 1928 images |
| Iberodes linifolia (L.) M.Serrano, R.Carbajal & S.Ortiz | 137 images |
| Ilex aquifolium L. | 16999 images |
| Ilex crenata Thunb. | 655 images |
| Iliamna bakeri (Jeps.) Wiggins | 16 images |
| Iliamna latibracteata Wiggins | 6 images |
| Iliamna rivularis (Douglas) Greene | 25 images |
| Impatiens aurella Rydb. | 5 images |
| Impatiens balfourii Hook.f. | 4958 images |
| Impatiens bicolor Royle | 2 images |
| Impatiens capensis Meerb. | 2752 images |
| Impatiens glandulifera Royle | 16802 images |
| Impatiens noli-tangere L. | 2601 images |
| Impatiens parviflora DC. | 7399 images |
| Imperata cylindrica (L.) Raeusch. | 718 images |
| Inula helenium L. | 3101 images |
| Ionactis stenomeres (A.Gray) Greene | 8 images |
| Ipheion uniflorum (Graham) Raf. | 2690 images |
| Ipomoea alba L. | 676 images |
| Ipomoea asarifolia (Desr.) Roem. & Schult. | 157 images |
| Ipomoea batatas (L.) Lam. | 4444 images |
| Ipomoea capillacea (Kunth) G.Don | 20 images |
| Ipomoea carnea Jacq. | 1004 images |
| Ipomoea cristulata Hallier f. | 54 images |
| Ipomoea hederacea Jacq. | 667 images |
| Ipomoea leptophylla Torr. | 45 images |
| Ipomoea purpurea (L.) Roth | 8296 images |
| Ipomopsis aggregata (Pursh) V.E.Grant | 1 images |
| Ipomopsis congesta (Hook.) V.E.Grant | 42 images |
| Ipomopsis longiflora (Torr.) V.E.Grant | 5 images |
| Ipomopsis multiflora (Nutt.) V.E.Grant | 2 images |
| Ipomopsis pumila (Nutt.) V.E.Grant | 5 images |
| Ipomopsis tenuituba (Rydb.) V.E.Grant | 61 images |
| Iris bracteata S.Watson | 1 images |
| Iris chrysophylla Howell | 21 images |
| Iris douglasiana Herb. | 342 images |
| Iris missouriensis Nutt. | 121 images |
| Iris pseudacorus L. | 10578 images |
| Iris sibirica L. | 2659 images |
| Iris tenax Douglas ex Lindl. | 53 images |
| Isatis tinctoria L. | 4010 images |
| Isolepis cernua (Vahl) Roem. & Schult. | 124 images |
| Isolepis setacea (L.) R.Br. | 89 images |
| Iva annua L. | 140 images |
| Iva axillaris Pursh | 6 images |
| Jacobaea vulgaris Gaertn. | 20302 images |
| Jamesia americana Torr. & A.Gray | 28 images |
| Jaumea carnosa A.Gray | 23 images |
| Juncus alpinoarticulatus Chaix | 152 images |
| Juncus articulatus L. | 837 images |
| Juncus balticus Willd. | 31 images |
| Juncus biglumis L. | 10 images |
| Juncus bolanderi Engelm. | 2 images |
| Juncus brachycephalus (Engelm.) Buchenau | 3 images |
| Juncus bufonius L. | 555 images |
| Juncus bulbosus L. | 215 images |
| Juncus canadensis J.Gay ex Laharpe | 2 images |
| Juncus castaneus Sm. | 16 images |
| Juncus compressus Jacq. | 244 images |
| Juncus covillei Piper | 2 images |
| Juncus dichotomus Elliott | 7 images |
| Juncus diffusissimus Buckley | 2 images |
| Juncus dudleyi Wiegand | 8 images |
| Juncus effusus L. | 4038 images |
| Juncus ensifolius Wikstr. | 97 images |
| Juncus filiformis L. | 115 images |
| Juncus gerardi Loisel. | 121 images |
| Juncus interior Wiegand | 3 images |
| Juncus lesueurii Bol. | 1 images |
| Juncus marginatus Rostk. | 4 images |
| Juncus mertensianus Bong. | 8 images |
| Juncus nodosus L. | 3 images |
| Juncus occidentalis Wiegand | 3 images |
| Juncus parryi Engelm. | 1 images |
| Juncus phaeocephalus Engelm. | 11 images |
| Juncus tenuis Willd. | 746 images |
| Juncus torreyi Coville | 32 images |
| Juncus triglumis L. | 91 images |
| Juniperus communis L. | 9389 images |
| Juniperus horizontalis Moench | 2044 images |
| Juniperus monosperma (Engelm.) Sarg. | 57 images |
| Juniperus occidentalis Hook. | 226 images |
| Juniperus osteosperma (Torr.) Little | 432 images |
| Juniperus scopulorum Sarg. | 611 images |
| Juniperus virginiana L. | 4783 images |
| Kallstroemia parviflora Norton | 2 images |
| Kalmia microphylla (Hook.) A.Heller | 13 images |
| Kalmia procumbens (L.) Gift, Kron & P.F.Stevens ex Galasso, Banfi & F.Conti | 489 images |
| Kalmiopsis fragrans Meinke & Kaye | 1 images |
| Kelloggia galioides Torr. | 9 images |
| Kelseya uniflora Rydb. | 2 images |
| Kickxia elatine (L.) Dumort. | 393 images |
| Kickxia spuria (L.) Dumort. | 905 images |
| Knautia arvensis (L.) Coult. | 16582 images |
| Kniphofia uvaria (L.) Oken | 7077 images |
| Koeleria macrantha (Ledeb.) Schult. | 141 images |
| Koeleria spicata (L.) Barberá, Quintanar, Soreng & P.M.Peterson | 87 images |
| Koelreuteria paniculata Laxm. | 10192 images |
| Koenigia islandica L. | 4 images |
| Koenigia polystachya (Wall. ex Meisn.) T.M.Schust. & Reveal | 329 images |
| Kopsiopsis hookeri (Walp.) Govaerts | 5 images |
| Krameria lanceolata Torr. | 45 images |
| Krigia biflora (Walter) S.F.Blake | 63 images |
| Lactuca biennis (Moench) Fernald | 169 images |
| Lactuca canadensis L. | 491 images |
| Lactuca graminifolia Michx. | 16 images |
| Lactuca muralis (L.) E.Mey. | 740 images |
| Lactuca saligna L. | 453 images |
| Lactuca sativa L. | 5156 images |
| Lactuca serriola L. | 13984 images |
| Lagophylla ramosissima Nutt. | 5 images |
| Lagurus ovatus L. | 3892 images |
| Lamium amplexicaule L. | 5294 images |
| Lamium hybridum Vill. | 8321 images |
| Lamium maculatum (L.) L. | 11638 images |
| Lamium purpureum L. | 16441 images |
| Langloisia setosissima (Torr.) Greene | 26 images |
| Lappula marginata (M.Bieb.) Gürke | 40 images |
| Lappula occidentalis (S.Watson) Greene | 6 images |
| Lappula squarrosa (Retz.) Dumort. | 257 images |
| Lapsana communis L. | 15430 images |
| Larix lyallii Parl. | 33 images |
| Larix occidentalis Nutt. | 156 images |
| Lasthenia californica DC. ex Lindl. | 127 images |
| Lasthenia glaberrima DC. | 9 images |
| Lathyrus angulatus L. | 131 images |
| Lathyrus aphaca L. | 652 images |
| Lathyrus brachycalyx Rydb. | 18 images |
| Lathyrus hirsutus L. | 703 images |
| Lathyrus japonicus Willd. | 730 images |
| Lathyrus lanszwertii Kellogg | 18 images |
| Lathyrus latifolius L. | 11013 images |
| Lathyrus nevadensis S.Watson | 8 images |
| Lathyrus nissolia L. | 524 images |
| Lathyrus ochroleucus Hook. | 38 images |
| Lathyrus oleraceus Lam. | 5397 images |
| Lathyrus palustris L. | 243 images |
| Lathyrus pauciflorus Fernald | 14 images |
| Lathyrus pratensis L. | 5456 images |
| Lathyrus rigidus T.G.White | 1 images |
| Lathyrus sphaericus Retz. | 556 images |
| Lathyrus sylvestris L. | 3128 images |
| Lathyrus tingitanus L. | 613 images |
| Lathyrus tuberosus L. | 2449 images |
| Lathyrus vestitus Nutt. | 3 images |
| Layia glandulosa (Hook.) Hook. & Arn. | 45 images |
| Leersia oryzoides (L.) Sw. | 291 images |
| Leersia virginica Willd. | 59 images |
| Lemna gibba L. | 77 images |
| Lemna minor L. | 1061 images |
| Lemna minuta Kunth | 116 images |
| Lemna trisulca L. | 124 images |
| Lemna turionifera Landolt | 22 images |
| Lemna valdiviana Phil. | 7 images |
| Leontodon saxatilis Lam. | 1508 images |
| Leonurus cardiaca L. | 3982 images |
| Lepidium alyssoides A.Gray | 6 images |
| Lepidium campestre (L.) W.T.Aiton | 28 images |
| Lepidium crenatum (Greene) Rydb. | 3 images |
| Lepidium davisii Rollins | 7 images |
| Lepidium densiflorum Schrad. | 70 images |
| Lepidium didymum L. | 1617 images |
| Lepidium draba L. | 8256 images |
| Lepidium heterophyllum Benth. | 329 images |
| Lepidium lasiocarpum Nutt. | 30 images |
| Lepidium latifolium L. | 884 images |
| Lepidium montanum Nutt. | 29 images |
| Lepidium nitidum Nutt. | 40 images |
| Lepidium oblongum Small | 10 images |
| Lepidium perfoliatum L. | 40 images |
| Lepidium ruderale L. | 266 images |
| Lepidium sativum L. | 946 images |
| Lepidium virginicum L. | 2022 images |
| Leptarrhena pyrolifolia (D.Don) Ser. | 15 images |
| Leptochloa panicea (Retz.) Ohwi | 5 images |
| Leptosiphon bicolor Nutt. | 13 images |
| Leptosiphon ciliatus (Benth.) Jeps. | 1 images |
| Leptosiphon liniflorus (Benth.) J.M.Porter & L.A.Johnson | 3 images |
| Leptosiphon nuttallii (A.Gray) J.M.Porter & L.A.Johnson | 5 images |
| Leucanthemum vulgare Lam. | 11180 images |
| Leucocrinum montanum Nutt. ex A.Gray | 78 images |
| Leucojum aestivum L. | 2248 images |
| Leucothoe davisiae Torr. | 36 images |
| Leuzea repens (L.) D.J.N.Hind | 34 images |
| Lewisia columbiana (Howell ex A.Gray) B.L.Rob. | 5 images |
| Lewisia cotyledon (S.Watson) B.L.Rob. | 394 images |
| Lewisia kelloggii K.Brandegee | 14 images |
| Lewisia leeana (Porter) B.L.Rob. | 81 images |
| Lewisia nevadensis (A.Gray) B.L.Rob. | 36 images |
| Lewisia oppositifolia (S.Watson) B.L.Rob. | 9 images |
| Lewisia pygmaea (A.Gray) B.L.Rob. | 26 images |
| Lewisia rediviva Pursh | 156 images |
| Lewisiopsis tweedyi (A.Gray) Govaerts | 6 images |
| Leymus cinereus (Scribn. & Merr.) Á.Löve | 3 images |
| Leymus innovatus (Beal) Pilg. | 1 images |
| Leymus mollis (Trin.) Pilg. | 7 images |
| Leymus racemosus (Lam.) Tzvelev | 17 images |
| Leymus triticoides (Buckley) Pilg. | 19 images |
| Liatris ligulistylis (A.Nelson) K.Schum. | 1 images |
| Liatris punctata Hook. | 205 images |
| Liatris spicata (L.) Willd. | 2617 images |
| Ligusticum filicinum S.Watson | 8 images |
| Ligusticum porteri J.M.Coult. & Rose | 1 images |
| Ligustrum vulgare L. | 20543 images |
| Lilaeopsis occidentalis J.M.Coult. & Rose | 9 images |
| Lilium bolanderi S.Watson | 27 images |
| Lilium columbianum Leichtlin | 221 images |
| Lilium kelloggii Purdy | 24 images |
| Lilium lancifolium Thunb. | 1944 images |
| Lilium occidentale Purdy | 2 images |
| Lilium pardalinum Kellogg | 108 images |
| Lilium philadelphicum L. | 121 images |
| Lilium washingtonianum Kellogg | 52 images |
| Limnanthes alba Hartw. ex Benth. | 10 images |
| Limnanthes douglasii R.Br. | 240 images |
| Limnanthes floccosa Howell | 8 images |
| Limonium californicum (Boiss.) A.Heller | 23 images |
| Limosella aquatica L. | 67 images |
| Linaria dalmatica (L.) Mill. | 224 images |
| Linaria genistifolia (L.) Mill. | 293 images |
| Linaria purpurea (L.) Mill. | 4096 images |
| Linaria triornithophora (L.) Cav. | 847 images |
| Linaria vulgaris Mill. | 18957 images |
| Lindernia dubia (L.) Pennell | 239 images |
| Linnaea borealis L. | 747 images |
| Linum aristatum Engelm. | 5 images |
| Linum bienne Mill. | 578 images |
| Linum digynum A.Gray | 3 images |
| Linum grandiflorum Desf. | 3062 images |
| Linum kingii S.Watson | 9 images |
| Linum lewisii Pursh | 181 images |
| Linum micranthum A.Gray | 5 images |
| Linum perenne L. | 3191 images |
| Linum pratense (Norton) Small | 36 images |
| Linum puberulum (Engelm.) A.Heller | 17 images |
| Linum rigidum Pursh | 18 images |
| Linum usitatissimum L. | 5896 images |
| Lipandra polysperma (L.) S.Fuentes, Uotila & Borsch | 1272 images |
| Liparis loeselii (L.) Rich. | 196 images |
| Lithophragma affine A.Gray | 92 images |
| Lithophragma glabrum Nutt. | 53 images |
| Lithophragma parviflorum (Hook.) Nutt. | 3 images |
| Lithophragma tenellum Nutt. | 5 images |
| Lithospermum californicum A.Gray | 10 images |
| Lithospermum incisum Lehm. | 141 images |
| Lithospermum multiflorum Torr. ex A.Gray | 12 images |
| Lithospermum ruderale Douglas ex Lehm. | 48 images |
| Lobelia cardinalis L. | 2233 images |
| Lobelia dortmanna L. | 172 images |
| Lobelia kalmii L. | 65 images |
| Lobelia siphilitica L. | 1420 images |
| Lobelia spicata Lam. | 134 images |
| Lobularia maritima (L.) Desv. | 13973 images |
| Loeflingia squarrosa Nutt. | 2 images |
| Logfia gallica (L.) Coss. & Germ. | 87 images |
| Logfia minima (Sm.) Dumort. | 238 images |
| Lolium arundinaceum (Schreb.) Darbysh. | 936 images |
| Lolium multiflorum Lam. | 416 images |
| Lolium perenne L. | 3496 images |
| Lolium pratense (Huds.) Darbysh. | 805 images |
| Lolium rigidum Gaudin | 216 images |
| Lolium temulentum L. | 31 images |
| Lomatium bicolor (S.Watson) J.M.Coult. & Rose | 12 images |
| Lomatium brandegeei (J.M.Coult. & Rose) J.F.Macbr. | 17 images |
| Lomatium canbyi (J.M.Coult. & Rose) J.M.Coult. & Rose | 16 images |
| Lomatium columbianum Mathias & Constance | 13 images |
| Lomatium cous (S.Watson) J.M.Coult. & Rose | 17 images |
| Lomatium dissectum (Nutt.) Mathias & Constance | 14 images |
| Lomatium engelmannii Mathias | 9 images |
| Lomatium foeniculaceum (Nutt.) J.M.Coult. & Rose | 7 images |
| Lomatium grayi (J.M.Coult. & Rose) J.M.Coult. & Rose | 31 images |
| Lomatium hallii (S.Watson) J.M.Coult. & Rose | 7 images |
| Lomatium hendersonii (J.M.Coult. & Rose) J.M.Coult. & Rose | 1 images |
| Lomatium howellii (S.Watson) Jeps. | 8 images |
| Lomatium latilobum (Rydb.) Mathias | 19 images |
| Lomatium linearifolium (S.Watson) J.F.Sm. & Mansfield | 3 images |
| Lomatium martindalei (J.M.Coult. & Rose) J.M.Coult. & Rose | 40 images |
| Lomatium mohavense (J.M.Coult. & Rose) J.M.Coult. & Rose | 31 images |
| Lomatium nevadense (S.Watson) J.M.Coult. & Rose | 37 images |
| Lomatium nudicaule (Nutt.) J.M.Coult. & Rose | 9 images |
| Lomatium ravenii Mathias & Constance | 5 images |
| Lomatium roseanum Cronquist | 5 images |
| Lomatium sandbergii (J.M.Coult. & Rose) J.M.Coult. & Rose | 1 images |
| Lomatium triternatum (Pursh) J.M.Coult. & Rose | 137 images |
| Lomatium utriculatum (Nutt.) J.M.Coult. & Rose | 133 images |
| Lomatium vaginatum J.M.Coult. & Rose | 3 images |
| Lomatogonium rotatum (L.) Fr. | 1 images |
| Lonicera caerulea L. | 1933 images |
| Lonicera ciliosa Poir. | 97 images |
| Lonicera conjugialis Kellogg | 36 images |
| Lonicera dioica L. | 123 images |
| Lonicera etrusca Santi | 4972 images |
| Lonicera hispidula (Lindl.) F.Dietr. | 11 images |
| Lonicera interrupta Benth. | 23 images |
| Lonicera involucrata (Richardson) Banks ex Spreng. | 883 images |
| Lonicera japonica Thunb. | 10884 images |
| Lonicera ligustrina Wall. | 3717 images |
| Lonicera maackii (Rupr.) Maxim. | 2638 images |
| Lonicera periclymenum L. | 8429 images |
| Lonicera tatarica L. | 5686 images |
| Lonicera utahensis S.Watson | 37 images |
| Lonicera xylosteum L. | 10965 images |
| Lotus corniculatus L. | 20135 images |
| Lotus pedunculatus Cav. | 4996 images |
| Lotus tenuis Waldst. & Kit. ex Willd. | 4998 images |
| Ludwigia grandiflora (Michx.) Greuter & Burdet | 1356 images |
| Ludwigia palustris (L.) Elliott | 322 images |
| Ludwigia peploides (Kunth) P.H.Raven | 801 images |
| Ludwigia repens J.R.Forst. | 8 images |
| Luetkea pectinata (Pursh) Kuntze | 59 images |
| Luina hypoleuca Benth. | 13 images |
| Lunaria annua L. | 21152 images |
| Lupinus albicaulis Douglas | 24 images |
| Lupinus albifrons Benth. | 431 images |
| Lupinus arboreus Sims | 677 images |
| Lupinus arcticus S.Watson | 30 images |
| Lupinus argenteus Pursh | 128 images |
| Lupinus bicolor Lindl. | 218 images |
| Lupinus densiflorus Benth. | 37 images |
| Lupinus formosus Greene | 68 images |
| Lupinus latifolius Lindl. ex J.Agardh | 2 images |
| Lupinus lepidus Douglas ex Lindl. | 13 images |
| Lupinus luteolus Kellogg | 9 images |
| Lupinus microcarpus Sims | 4 images |
| Lupinus nootkatensis Donn ex Sims | 222 images |
| Lupinus oreganus A.Heller | 2 images |
| Lupinus pachylobus Greene | 1 images |
| Lupinus polyphyllus Lindl. | 9006 images |
| Lupinus prunophilus M.E.Jones | 1 images |
| Lupinus pusillus Pursh | 14 images |
| Lupinus rivularis Douglas ex Lindl. | 1 images |
| Lupinus sellulus Kellogg | 53 images |
| Lupinus sericeus Pursh | 49 images |
| Lupinus sulphureus Douglas | 3 images |
| Lupinus tracyi Eastw. | 1 images |
| Luzula multiflora (Ehrh.) Lej. | 382 images |
| Luzula parviflora (Ehrh.) Desv. | 4 images |
| Luzula spicata (L.) DC. | 68 images |
| Lycium barbarum L. | 3304 images |
| Lycium pallidum Miers | 19 images |
| Lycopodiella inundata (L.) Holub | 158 images |
| Lycopodium × zeilleri (Rouy) Greuter & Burdet | 59 images |
| Lycopodium alpinum L. | 177 images |
| Lycopodium annotinum L. | 1061 images |
| Lycopodium clavatum L. | 800 images |
| Lycopodium complanatum L. | 259 images |
| Lycopodium dendroideum Michx. | 232 images |
| Lycopus americanus Muhl. ex W.P.C.Barton | 8 images |
| Lycopus asper Greene | 11 images |
| Lycopus rubellus Moench | 8 images |
| Lycopus uniflorus Michx. | 158 images |
| Lycopus virginicus L. | 40 images |
| Lygodesmia grandiflora Torr. & A.Gray | 32 images |
| Lysichiton americanus Hultén & H.St.John | 633 images |
| Lysimachia arvensis (L.) U.Manns & Anderb. | 11334 images |
| Lysimachia ciliata L. | 1011 images |
| Lysimachia europaea (L.) U.Manns & Anderb. | 1292 images |
| Lysimachia foemina (Mill.) U.Manns & Anderb. | 2511 images |
| Lysimachia hybrida Michx. | 1 images |
| Lysimachia latifolia (Hook.) Cholewa | 1 images |
| Lysimachia maritima (L.) Galasso, Banfi & Soldano | 447 images |
| Lysimachia minima (L.) U.Manns & Anderb. | 18 images |
| Lysimachia nummularia L. | 4935 images |
| Lysimachia punctata L. | 10345 images |
| Lysimachia terrestris (L.) Britton, Sterns & Poggenb. | 37 images |
| Lysimachia thyrsiflora L. | 375 images |
| Lysimachia vulgaris L. | 9543 images |
| Lythrum alatum Pursh | 62 images |
| Lythrum hyssopifolia L. | 573 images |
| Lythrum portula (L.) D.A.Webb | 265 images |
| Lythrum salicaria L. | 26224 images |
| Lythrum tribracteatum Salzm. ex Spreng. | 94 images |
| Lythrum virgatum L. | 3963 images |
| Machaeranthera tanacetifolia (Kunth) Nees | 134 images |
| Maclura pomifera (Raf.) C.K.Schneid. | 4377 images |
| Madia elegans D.Don | 94 images |
| Madia exigua (Sm.) Greene | 2 images |
| Madia glomerata Hook. | 6 images |
| Madia gracilis (Sm.) D.D.Keck & J.C.Clausen ex Applegate | 4 images |
| Madia sativa Molina | 84 images |
| Maianthemum canadense Desf. | 1131 images |
| Maianthemum dilatatum (Alph.Wood) A.Nelson & J.F.Macbr. | 42 images |
| Maianthemum racemosum (L.) Link | 1644 images |
| Maianthemum stellatum (L.) Link | 601 images |
| Malacothrix glabrata A.Gray | 96 images |
| Malacothrix sonchoides (Nutt.) Torr. & A.Gray | 8 images |
| Malacothrix torreyi A.Gray | 1 images |
| Malaxis monophyllos (L.) Sw. | 53 images |
| Malus baccata (L.) Borkh. | 2965 images |
| Malus domestica (Suckow) Borkh. | 8646 images |
| Malus fusca (Raf.) C.K.Schneid. | 2 images |
| Malus hupehensis (Pamp.) Rehder | 2075 images |
| Malus prunifolia (Willd.) Borkh. | 249 images |
| Malus toringo (Siebold) de Vriese | 132 images |
| Malva alcea L. | 14020 images |
| Malva arborea (L.) Webb & Berthel. | 7927 images |
| Malva moschata L. | 5903 images |
| Malva neglecta Wallr. | 5969 images |
| Malva parviflora L. | 2981 images |
| Malva pusilla Sm. | 1583 images |
| Malva sylvestris L. | 27320 images |
| Malva thuringiaca (L.) Vis. | 830 images |
| Malva verticillata L. | 260 images |
| Malvella leprosa (Ortega) Krapov. | 120 images |
| Marah oregana (Torr. & A.Gray) Howell | 24 images |
| Marrubium vulgare L. | 4568 images |
| Matricaria chamomilla L. | 10405 images |
| Matricaria discoidea DC. | 3903 images |
| Matricaria occidentalis Greene | 13 images |
| Mazus pumilus (Burm.f.) Steenis | 274 images |
| Meconella oregana Nutt. | 17 images |
| Medicago arabica (L.) Huds. | 3545 images |
| Medicago falcata L. | 1777 images |
| Medicago lupulina L. | 7913 images |
| Medicago minima (L.) Bartal. | 50 images |
| Medicago polymorpha L. | 2842 images |
| Medicago praecox DC. | 52 images |
| Medicago sativa L. | 17649 images |
| Medicago turbinata (L.) All. | 10 images |
| Melampodium leucanthum Torr. & A.Gray | 74 images |
| Melampyrum lineare Lam. | 180 images |
| Melanocalyx uniflora (L.) Morin | 2 images |
| Melica californica Scribn. | 11 images |
| Melica geyeri Munro ex Bol. | 4 images |
| Melica harfordii Bol. | 5 images |
| Melica nitens (Scribn.) Nutt. ex Piper | 3 images |
| Melica porteri Scribn. | 1 images |
| Melica stricta Bol. | 11 images |
| Melica subulata (Griseb.) Scribn. | 2 images |
| Melilotus albus Medik. | 8315 images |
| Melilotus indicus (L.) All. | 2410 images |
| Melilotus officinalis (L.) Lam. | 4714 images |
| Melissa officinalis L. | 14803 images |
| Mentha × dumetorum Schult. | 1 images |
| Mentha × piperita L. | 3686 images |
| Mentha × villosa Huds. | 517 images |
| Mentha arvensis L. | 3491 images |
| Mentha canadensis L. | 14 images |
| Mentha spicata L. | 9335 images |
| Mentha suaveolens Ehrh. | 11492 images |
| Mentzelia decapetala (Sims) Urb. | 14 images |
| Mentzelia dispersa S.Watson | 2 images |
| Mentzelia laevicaulis (Douglas ex Hook.) Torr. & A.Gray | 4 images |
| Mentzelia montana (Davidson) Davidson | 3 images |
| Mentzelia multiflora (Nutt.) A.Gray | 72 images |
| Mentzelia oligosperma Nutt. ex Sims | 1 images |
| Mentzelia torreyi A.Gray | 7 images |
| Mentzelia veatchiana Kellogg | 21 images |
| Menyanthes trifoliata L. | 2004 images |
| Mertensia arizonica Greene | 4 images |
| Mertensia bella Piper | 4 images |
| Mertensia franciscana A.Heller | 11 images |
| Mertensia lanceolata (Pursh) DC. | 26 images |
| Mertensia longiflora Greene | 7 images |
| Mertensia oblongifolia (Nutt.) G.Don | 26 images |
| Mertensia paniculata (Aiton) G.Don | 81 images |
| Mesembryanthemum cordifolium L.f. | 7567 images |
| Micranthes apetala (Piper) Small | 1 images |
| Micranthes bryophora (A.Gray) Brouillet & Gornall | 27 images |
| Micranthes californica (Greene) Small | 93 images |
| Micranthes ferruginea (Graham) Brouillet & Gornall | 18 images |
| Micranthes hieraciifolia (Waldst. & Kit. ex Willd.) Haw. | 1 images |
| Micranthes howellii (Greene) Small | 4 images |
| Micranthes integrifolia (Hook.) Small | 28 images |
| Micranthes lyallii (Engl.) Small | 6 images |
| Micranthes mertensiana (Bong.) Rosend. | 21 images |
| Micranthes nidifica (Greene) Small | 5 images |
| Micranthes oregana (Howell) Small | 61 images |
| Micranthes rhomboidea (Greene) Small | 16 images |
| Micranthes rufidula Small | 3 images |
| Micranthes tolmiei (Torr. & A.Gray) Brouillet & Gornall | 7 images |
| Micromeria douglasii Benth. | 1 images |
| Microseris alpestris (A.Gray) Q.Jones ex Cronquist | 21 images |
| Microseris bigelovii (A.Gray) Sch.Bip. | 2 images |
| Microseris borealis (Bong.) Sch.Bip. | 10 images |
| Microseris cuspidata (Pursh) Sch.Bip. | 15 images |
| Microseris douglasii (DC.) Sch.Bip. | 13 images |
| Microseris howellii A.Gray | 2 images |
| Microseris laciniata (Hook.) Sch.Bip. | 2 images |
| Microseris lindleyi (DC.) A.Gray | 1 images |
| Microseris nutans (Hook.) Sch.Bip. | 7 images |
| Microseris troximoides A.Gray | 12 images |
| Microsteris gracilis (Hook.) Greene | 20 images |
| Milium vernale M.Bieb. | 6 images |
| Mimetanthe pilosa (Benth.) Greene | 30 images |
| Mimosa quadrivalvis L. | 311 images |
| Mimulus ringens L. | 524 images |
| Mirabilis albida (Walter) Heimerl | 52 images |
| Mirabilis alipes (S.Watson) Pils | 13 images |
| Mirabilis laevis (Benth.) Curran | 178 images |
| Mirabilis linearis (Pursh) Heimerl | 17 images |
| Mirabilis melanotricha (Standl.) Spellenb. | 16 images |
| Mirabilis multiflora (Torr.) A.Gray | 163 images |
| Mirabilis nyctaginea (Michx.) MacMill. | 281 images |
| Miscanthus sinensis Andersson | 4075 images |
| Misopates orontium (L.) Raf. | 1917 images |
| Mitella nuda L. | 16 images |
| Mitellastra caulescens (Nutt.) Howell | 2 images |
| Modiola caroliniana (L.) G.Don | 241 images |
| Moehringia lateriflora (L.) Fenzl | 43 images |
| Moehringia macrophylla (Hook.) Fenzl | 30 images |
| Moenchia erecta (L.) G.Gaertn., B.Mey. & Scherb. | 58 images |
| Molinia caerulea (L.) Moench | 1355 images |
| Mollugo verticillata L. | 368 images |
| Moluccella laevis L. | 315 images |
| Monarda fistulosa L. | 2789 images |
| Monarda pectinata Nutt. | 15 images |
| Monardella odoratissima Benth. | 223 images |
| Monardella purpurea Howell | 26 images |
| Moneses uniflora (L.) A.Gray | 408 images |
| Monotropa hypopitys L. | 1310 images |
| Monotropa uniflora L. | 1240 images |
| Montia chamissoi (Ledeb. ex Spreng.) Greene | 6 images |
| Montia fontana L. | 274 images |
| Montia howellii S.Watson | 5 images |
| Montia linearis (Douglas) Greene | 13 images |
| Montia parvifolia (Moc. ex DC.) Greene | 21 images |
| Moorochloa eruciformis (Sm.) Veldkamp | 11 images |
| Morus alba L. | 12174 images |
| Muhlenbergia glomerata (Willd.) Trin. | 1 images |
| Muhlenbergia mexicana (L.) Trin. | 11 images |
| Muhlenbergia pauciflora Buckley | 7 images |
| Muhlenbergia porteri Scribn. | 10 images |
| Muhlenbergia pungens Thurb. | 1 images |
| Muhlenbergia schreberi J.F.Gmel. | 13 images |
| Muhlenbergia torreyi (Kunth) Hitchc. ex Bush | 2 images |
| Muhlenbergia tricholepis (Torr.) P.M.Peterson | 3 images |
| Murdannia keisak (Hassk.) Hand.-Mazz. | 19 images |
| Muscari botryoides (L.) Mill. | 5614 images |
| Muscari comosum (L.) Mill. | 11341 images |
| Myosotis arvensis (L.) Hill | 3511 images |
| Myosotis asiatica (Vestergr.) Schischk. & Serg. | 15 images |
| Myosotis discolor Pers. | 880 images |
| Myosotis latifolia Poir. | 541 images |
| Myosotis laxa Lehm. | 342 images |
| Myosotis scorpioides L. | 6318 images |
| Myosotis stricta Link ex Roem. & Schult. | 739 images |
| Myosotis sylvatica Ehrh. ex Hoffm. | 572 images |
| Myosotis verna Nutt. | 13 images |
| Myrica californica Cham. | 58 images |
| Myrica gale L. | 795 images |
| Myriophyllum aquaticum (Vell.) Verdc. | 633 images |
| Myriophyllum heterophyllum Michx. | 10 images |
| Myriophyllum quitense Kunth | 12 images |
| Myriophyllum sibiricum Kom. | 8 images |
| Myriophyllum spicatum L. | 392 images |
| Myriophyllum verticillatum L. | 78 images |
| Myrrhis odorata (L.) Scop. | 1772 images |
| Najas guadalupensis (Spreng.) Magnus | 14 images |
| Nama lobbii A.Gray | 11 images |
| Narcissus × incomparabilis Mill. | 85 images |
| Narcissus poeticus L. | 3119 images |
| Narcissus pseudonarcissus L. | 9546 images |
| Narcissus tazetta L. | 3188 images |
| Nardus stricta L. | 386 images |
| Narthecium californicum Baker | 13 images |
| Nassella chilensis (Trin.) É.Desv. | 1 images |
| Nassella tenuissima (Trin.) Barkworth | 1439 images |
| Nasturtium microphyllum (Boenn.) Rchb. | 75 images |
| Nasturtium officinale W.T.Aiton | 884 images |
| Navarretia breweri (A.Gray) Greene | 21 images |
| Navarretia capillaris (Kellogg) Kuntze | 4 images |
| Navarretia divaricata Greene | 2 images |
| Navarretia heterandra H.Mason | 4 images |
| Navarretia intertexta (Benth.) Hook. | 26 images |
| Navarretia leptalea (A.Gray) L.A.Johnson | 44 images |
| Navarretia leucocephala Benth. | 28 images |
| Navarretia squarrosa (Eschsch.) Hook. & Arn. | 5 images |
| Navarretia subuligera Greene | 2 images |
| Navarretia tagetina Greene | 3 images |
| Nemacladus rigidus Curran | 9 images |
| Nemophila breviflora A.Gray | 2 images |
| Nemophila heterophylla Fisch. & C.A.Mey. | 1 images |
| Nemophila maculata Benth. ex Lindl. | 449 images |
| Nemophila menziesii Hook. & Arn. | 470 images |
| Nemophila parviflora Douglas ex Benth. | 14 images |
| Nemophila pedunculata Douglas ex Benth. | 7 images |
| Neottia banksiana (Lindl.) Rchb.f. | 2 images |
| Neottia convallarioides (Sw.) Rich. | 4 images |
| Neottia cordata (L.) Rich. | 219 images |
| Nepeta cataria L. | 4198 images |
| Nepeta grandiflora M.Bieb. | 272 images |
| Nepeta racemosa Lam. | 5933 images |
| Nephrophyllidium crista-galli (Menzies ex Hook.) Gilg | 12 images |
| Neslia paniculata (L.) Desv. | 86 images |
| Nestotus stenophyllus (A.Gray) R.P.Roberts, Urbatsch & Neubig | 9 images |
| Nicandra physalodes (L.) Gaertn. | 3282 images |
| Nicotiana quadrivalvis Pursh | 66 images |
| Nigella damascena L. | 14180 images |
| Noccaea fendleri (A.Gray) Holub | 36 images |
| Noccaea perfoliata (L.) Al-Shehbaz | 1254 images |
| Nolina texana S.Watson | 25 images |
| Nothochelone nemorosa (Douglas ex Lindl.) Straw | 37 images |
| Notholithocarpus densiflorus (Hook. & Arn.) Manos, Cannon & S.H.Oh | 38 images |
| Nuphar polysepala Engelm. | 4 images |
| Nuttallanthus canadensis (L.) D.A.Sutton | 30 images |
| Nymphaea odorata Aiton | 470 images |
| Nymphaea tetragona Georgi | 65 images |
| Nymphoides peltata (S.G.Gmel.) Kuntze | 535 images |
| Odontarrhena muralis (Waldst. & Kit.) Endl. | 150 images |
| Oemleria cerasiformis (Torr. & A.Gray ex Hook. & Arn.) J.W.Landon | 285 images |
| Oenanthe sarmentosa C.Presl ex DC. | 81 images |
| Oenothera albicaulis Pursh | 65 images |
| Oenothera biennis L. | 15647 images |
| Oenothera cespitosa Nutt. | 54 images |
| Oenothera elata Kunth | 197 images |
| Oenothera filiformis (Small) W.L.Wagner & Hoch | 4 images |
| Oenothera flava (A.Nelson) Garrett | 41 images |
| Oenothera glazioviana Micheli | 9082 images |
| Oenothera grandis Smyth | 2 images |
| Oenothera hartwegii Benth. | 102 images |
| Oenothera howardii (A.Nelson) M.E.Jones ex Prain | 19 images |
| Oenothera laciniata Hill | 601 images |
| Oenothera lavandulifolia Torr. & A.Gray | 3 images |
| Oenothera mollissima L. | 6 images |
| Oenothera nuttallii Torr. & A.Gray | 2 images |
| Oenothera pallida Lindl. | 41 images |
| Oenothera rhombipetala Nutt. | 12 images |
| Oenothera suffrutescens (Moc. & Sessé ex Ser.) W.L.Wagner & Hoch | 106 images |
| Oenothera triloba Nutt. | 85 images |
| Oenothera villosa Thunb. | 112 images |
| Oloptum miliaceum (L.) Röser & Hamasha | 933 images |
| Olsynium douglasii (A.Dietr.) E.P.Bicknell | 9 images |
| Onobrychis viciifolia Scop. | 7932 images |
| Onoclea sensibilis L. | 1825 images |
| Onopordum acanthium L. | 5571 images |
| Onopordum tauricum Willd. | 534 images |
| Oonopsis wardii (A.Gray) Greene | 4 images |
| Ophioglossum pusillum Raf. | 4 images |
| Oplopanax horridus (Sm.) Miq. | 284 images |
| Opuntia camanchica Engelm. & J.M.Bigelow | 2 images |
| Opuntia fragilis (Nutt.) Haw. | 175 images |
| Opuntia macrorhiza Engelm. | 81 images |
| Opuntia phaeacantha Engelm. | 595 images |
| Opuntia polyacantha Haw. | 544 images |
| Oreocarya flava A.Nelson | 1 images |
| Oreocarya flavoculata A.Nelson | 1 images |
| Oreocarya humilis (A.Gray) Greene | 17 images |
| Oreocarya spiculifera Piper | 1 images |
| Oreocarya suffruticosa (Torr.) Greene | 1 images |
| Oreocarya thyrsiflora Greene | 5 images |
| Oreocarya virgata (Porter) Greene | 23 images |
| Oreochrysum parryi Rydb. | 8 images |
| Oreostemma alpigenum (Torr. & A.Gray) Greene | 18 images |
| Origanum vulgare L. | 22227 images |
| Ornithogalum nutans L. | 1272 images |
| Ornithogalum umbellatum L. | 8655 images |
| Ornithopus compressus L. | 671 images |
| Ornithopus perpusillus L. | 611 images |
| Orobanche californica Cham. & Schltdl. | 2 images |
| Orobanche fasciculata Nutt. | 139 images |
| Orobanche ludoviciana Nutt. | 11 images |
| Orobanche minor Sm. | 2400 images |
| Orobanche parishii (Jeps.) Heckard | 43 images |
| Orobanche pinorum Geyer ex Hook. | 3 images |
| Orobanche uniflora L. | 117 images |
| Orthilia secunda (L.) House | 582 images |
| Orthocarpus bracteosus Benth. | 5 images |
| Orthocarpus cuspidatus Greene | 29 images |
| Orthocarpus imbricatus S.Watson | 2 images |
| Orthocarpus luteus Nutt. | 5 images |
| Orthocarpus tenuifolius (Pursh) Benth. | 8 images |
| Oryzopsis asperifolia Michx. | 4 images |
| Osmorhiza berteroi DC. | 9 images |
| Osmorhiza depauperata Phil. | 7 images |
| Osmorhiza longistylis (Torr.) DC. | 384 images |
| Osmorhiza occidentalis (Nutt.) Torr. | 16 images |
| Osmorhiza purpurea (J.M.Coult. & Rose) Suksd. | 5 images |
| Ostrya virginiana (Mill.) K.Koch | 427 images |
| Oxalis articulata Savigny | 5632 images |
| Oxalis corniculata L. | 9953 images |
| Oxalis debilis Kunth | 3127 images |
| Oxalis dillenii Jacq. | 2749 images |
| Oxalis oregana Nutt. | 415 images |
| Oxalis stricta L. | 2873 images |
| Oxalis suksdorfii Trel. | 21 images |
| Oxalis trilliifolia Hook. | 15 images |
| Oxalis violacea L. | 614 images |
| Oxybasis chenopodioides (L.) S.Fuentes, Uotila & Borsch | 75 images |
| Oxybasis glauca (L.) S.Fuentes, Uotila & Borsch | 289 images |
| Oxybasis rubra (L.) S.Fuentes, Uotila & Borsch | 693 images |
| Oxypolis fendleri (A.Gray) A.Heller | 7 images |
| Oxypolis occidentalis J.M.Coult. & Rose | 12 images |
| Oxyria digyna (L.) Hill | 466 images |
| Oxytropis campestris (L.) DC. | 658 images |
| Oxytropis deflexa (Pall.) DC. | 14 images |
| Oxytropis lambertii Pursh | 69 images |
| Oxytropis splendens Douglas | 26 images |
| Ozomelis stauropetala (Piper) Rydb. | 9 images |
| Ozomelis trifida (Graham) Rydb. | 7 images |
| Packera cana (Hook.) W.A.Weber & Á.Löve | 2 images |
| Packera multilobata (Torr. & A.Gray) W.A.Weber & Á.Löve | 1 images |
| Packera paupercula (Michx.) Á.Löve & D.Löve | 2 images |
| Packera plattensis (Nutt.) W.A.Weber & Á.Löve | 1 images |
| Paeonia brownii Douglas ex Hook. | 43 images |
| Palafoxia rosea (Bush) Cory | 16 images |
| Palafoxia sphacelata (Nutt. ex Torr.) Cory | 11 images |
| Palustricodon aparinoides (Pursh) Morin | 20 images |
| Panicum capillare L. | 823 images |
| Panicum dichotomiflorum Michx. | 98 images |
| Panicum miliaceum L. | 1416 images |
| Panicum virgatum L. | 1143 images |
| Papaver dubium L. | 4341 images |
| Papaver kluanense D.Löve | 1 images |
| Papaver nudicaule L. | 430 images |
| Papaver orientale L. | 4975 images |
| Papaver rhoeas L. | 12602 images |
| Papaver somniferum L. | 11499 images |
| Pappostipa speciosa (Trin. & Rupr.) Romasch. | 14 images |
| Parapholis incurva (L.) C.E.Hubb. | 90 images |
| Parentucellia viscosa (L.) Caruel | 1105 images |
| Parietaria pensylvanica Muhl. ex Willd. | 231 images |
| Parnassia cirrata Piper | 15 images |
| Parnassia fimbriata K.D.Koenig | 48 images |
| Parnassia palustris L. | 5036 images |
| Paronychia pulvinata A.Gray | 1 images |
| Paronychia sessiliflora Nutt. | 4 images |
| Parthenocissus quinquefolia (L.) Planch. | 18038 images |
| Parthenocissus vitacea (Knerr) Hitchc. | 3 images |
| Paspalum dilatatum Poir. | 1380 images |
| Paspalum distichum L. | 284 images |
| Paspalum setaceum Michx. | 13 images |
| Pastinaca sativa L. | 7619 images |
| Paulownia tomentosa (Thunb.) Steud. | 10684 images |
| Paxistima myrsinites (Pursh) Raf. | 88 images |
| Pectiantia pentandra (Hook.) Rydb. | 23 images |
| Pectis angustifolia Torr. | 12 images |
| Pectocarya penicillata A.DC. | 1 images |
| Pectocarya setosa A.Gray | 21 images |
| Pedicularis attollens A.Gray | 71 images |
| Pedicularis bracteosa Benth. | 52 images |
| Pedicularis canadensis L. | 211 images |
| Pedicularis centranthera A.Gray | 10 images |
| Pedicularis contorta Benth. | 23 images |
| Pedicularis crenulata Benth. | 6 images |
| Pedicularis cystopteridifolia Rydb. | 3 images |
| Pedicularis densiflora Benth. | 76 images |
| Pedicularis groenlandica Retz. | 134 images |
| Pedicularis oederi Vahl | 91 images |
| Pedicularis ornithorhynchos Benth. | 11 images |
| Pedicularis parryi A.Gray | 10 images |
| Pedicularis procera A.Gray | 4 images |
| Pedicularis racemosa Douglas ex Benth. | 45 images |
| Pedicularis semibarbata A.Gray | 49 images |
| Pediocactus knowltonii L.D.Benson | 7 images |
| Pediocactus nigrispinus (Hochstätter) Hochstätter | 1 images |
| Pediocactus simpsonii (Engelm.) Britton & Rose | 23 images |
| Peganum harmala L. | 452 images |
| Peltandra virginica (L.) Schott | 169 images |
| Penstemon acuminatus Douglas ex Lindl. | 13 images |
| Penstemon albertinus Greene | 21 images |
| Penstemon albidus Nutt. | 11 images |
| Penstemon ambiguus Torr. | 23 images |
| Penstemon anguineus Eastw. | 10 images |
| Penstemon angustifolius Nutt. ex Pursh | 10 images |
| Penstemon arenicola A.Nelson | 3 images |
| Penstemon aridus Rydb. | 4 images |
| Penstemon azureus Benth. | 8 images |
| Penstemon barbatus (Cav.) Roth | 1304 images |
| Penstemon barrettiae A.Gray | 5 images |
| Penstemon buckleyi Pennell | 6 images |
| Penstemon caespitosus Nutt. ex A.Gray | 9 images |
| Penstemon cardwellii Howell | 10 images |
| Penstemon cobaea Nutt. | 195 images |
| Penstemon confertus Douglas | 38 images |
| Penstemon cyananthus Hook. | 42 images |
| Penstemon cyaneus Pennell | 1 images |
| Penstemon cyathophorus Rydb. | 2 images |
| Penstemon davidsonii Greene | 97 images |
| Penstemon deustus Douglas | 55 images |
| Penstemon eatonii A.Gray | 87 images |
| Penstemon eriantherus Nutt. ex Pursh | 8 images |
| Penstemon euglaucus English | 3 images |
| Penstemon fruticosus (Pursh) Greene | 59 images |
| Penstemon glaber Pursh | 21 images |
| Penstemon gracilentus A.Gray | 39 images |
| Penstemon gracilis Nutt. | 21 images |
| Penstemon hallii A.Gray | 10 images |
| Penstemon haydenii S.Watson ex J.M.Coult. | 2 images |
| Penstemon humilis Nutt. ex A.Gray | 32 images |
| Penstemon jamesii Benth. | 17 images |
| Penstemon laetus A.Gray | 50 images |
| Penstemon lentus Pennell | 8 images |
| Penstemon linarioides A.Gray | 23 images |
| Penstemon lyallii (A.Gray) A.Gray | 4 images |
| Penstemon montanus Greene | 8 images |
| Penstemon newberryi A.Gray | 147 images |
| Penstemon nitidus Douglas ex Benth. | 16 images |
| Penstemon osterhoutii Pennell | 4 images |
| Penstemon palmeri A.Gray | 112 images |
| Penstemon perpulcher A.Nelson | 6 images |
| Penstemon procerus Douglas ex Graham | 68 images |
| Penstemon pruinosus Douglas | 13 images |
| Penstemon rattanii A.Gray | 4 images |
| Penstemon richardsonii Douglas ex Lindl. | 8 images |
| Penstemon roezlii Regel | 31 images |
| Penstemon rostriflorus Kellogg | 96 images |
| Penstemon rupicola (Piper) Howell | 29 images |
| Penstemon rydbergii A.Nelson | 79 images |
| Penstemon scariosus Pennell | 8 images |
| Penstemon secundiflorus Benth. | 63 images |
| Penstemon serrulatus Menzies ex Sm. | 53 images |
| Penstemon speciosus Douglas | 129 images |
| Penstemon strictus Benth. | 170 images |
| Penstemon subglaber Rydb. | 2 images |
| Penstemon utahensis Eastw. | 51 images |
| Penstemon venustus Douglas | 3 images |
| Penstemon virens Pennell ex Rydb. | 30 images |
| Penstemon virgatus A.Gray | 11 images |
| Penstemon watsonii A.Gray | 12 images |
| Penstemon whippleanus A.Gray | 57 images |
| Penstemon wilcoxii Rydb. | 1 images |
| Pentaglottis sempervirens (L.) Tausch ex L.H.Bailey | 6910 images |
| Penthorum sedoides L. | 62 images |
| Pericome caudata A.Gray | 16 images |
| Perideridia bolanderi (A.Gray) A.Nelson & J.F.Macbr. | 22 images |
| Perideridia gairdneri (Hook. & Arn.) Mathias | 2 images |
| Perideridia howellii (J.M.Coult. & Rose) Mathias | 4 images |
| Perideridia lemmonii (J.M.Coult. & Rose) T.I.Chuang & Constance | 10 images |
| Perideridia oregana (Nutt.) Mathias | 7 images |
| Persicaria amphibia (L.) Delarbre | 553 images |
| Persicaria capitata (Buch.-Ham. ex D.Don) H.Gross | 2409 images |
| Persicaria hydropiper (L.) Delarbre | 879 images |
| Persicaria hydropiperoides (Michx.) Small | 21 images |
| Persicaria lapathifolia (L.) Delarbre | 4143 images |
| Persicaria maculosa Gray | 10703 images |
| Persicaria orientalis (L.) Spach | 3275 images |
| Persicaria pensylvanica (L.) M.Gómez | 83 images |
| Persicaria perfoliata (L.) H.Gross | 12 images |
| Persicaria punctata (Elliott) Small | 111 images |
| Persicaria sagittata (L.) H.Gross | 42 images |
| Persicaria senticosa (Meisn.) H.Gross | 2 images |
| Petasites frigidus (L.) Fr. | 253 images |
| Petradoria pumila (Nutt.) Greene | 12 images |
| Petrophytum caespitosum (Nutt.) Rydb. | 23 images |
| Petrophytum cinerascens (Piper) Rydb. | 5 images |
| Petrorhagia dubia (Raf.) G.López & Romo | 62 images |
| Petrorhagia prolifera (L.) P.W.Ball & Heywood | 1529 images |
| Petrorhagia saxifraga (L.) Link | 2075 images |
| Petrosedum forsterianum (Sm.) Grulich | 1059 images |
| Petrosedum orientale ('t Hart) Grulich | 2 images |
| Petroselinum crispum (Mill.) Fuss | 2887 images |
| Phacelia alba Rydb. | 1 images |
| Phacelia bicolor Torr. ex S.Watson | 40 images |
| Phacelia bolanderi A.Gray | 20 images |
| Phacelia californica Cham. | 141 images |
| Phacelia corymbosa Jeps. | 7 images |
| Phacelia gymnoclada Torr. ex S.Watson | 10 images |
| Phacelia hastata Douglas ex Lehm. | 89 images |
| Phacelia heterophylla Pursh | 59 images |
| Phacelia hydrophylloides Torr. ex A.Gray | 6 images |
| Phacelia incana Brand | 1 images |
| Phacelia integrifolia Torr. | 20 images |
| Phacelia ivesiana Torr. | 4 images |
| Phacelia leptosepala Rydb. | 4 images |
| Phacelia linearis (Pursh) Holz. | 65 images |
| Phacelia malvifolia Cham. & Schltdl. | 23 images |
| Phacelia mutabilis Greene | 42 images |
| Phacelia nemoralis Greene | 17 images |
| Phacelia procera A.Gray | 5 images |
| Phacelia purshii Buckley | 113 images |
| Phacelia ramosissima Douglas ex Lehm. | 96 images |
| Phacelia rattanii A.Gray | 2 images |
| Phacelia scopulina (A.Nelson) J.T.Howell | 4 images |
| Phacelia sericea (Graham) A.Gray | 48 images |
| Phacelia tanacetifolia Benth. | 17805 images |
| Phacelia thermalis Greene | 1 images |
| Phalaris angusta Nees ex Trin. | 6 images |
| Phalaris aquatica L. | 259 images |
| Phalaris arundinacea L. | 3388 images |
| Phalaris brachystachys Link | 10 images |
| Phalaris canariensis L. | 545 images |
| Phalaris minor Retz. | 178 images |
| Phalaris paradoxa L. | 91 images |
| Phedimus spurius (M.Bieb.) 't Hart | 4682 images |
| Phegopteris connectilis (Michx.) Watt | 808 images |
| Phemeranthus calycinus (Engelm.) Kiger | 15 images |
| Phemeranthus parviflorus (Nutt.) Kiger | 7 images |
| Phemeranthus spinescens (Torr.) Hershk. | 2 images |
| Philadelphus lewisii Pursh | 1174 images |
| Philadelphus microphyllus A.Gray | 20 images |
| Philadelphus pubescens Loisel. | 1646 images |
| Phleum alpinum L. | 387 images |
| Phleum arenarium L. | 135 images |
| Phleum paniculatum Huds. | 9 images |
| Phleum pratense L. | 3310 images |
| Phleum subulatum (Savi) Asch. & Graebn. | 6 images |
| Phlox aculeata A.Nelson | 11 images |
| Phlox adsurgens Torr. ex A.Gray | 12 images |
| Phlox austromontana Coville | 63 images |
| Phlox caespitosa Nutt. | 25 images |
| Phlox condensata (A.Gray) E.E.Nelson | 7 images |
| Phlox diffusa Benth. | 205 images |
| Phlox douglasii Hook. | 6 images |
| Phlox hoodii Richardson | 82 images |
| Phlox kelseyi Britton | 3 images |
| Phlox longifolia Nutt. | 114 images |
| Phlox multiflora A.Nelson | 1 images |
| Phlox paniculata L. | 7173 images |
| Phlox pulvinata (Wherry) Cronquist | 16 images |
| Phlox speciosa Pursh | 86 images |
| Phoenicaulis cheiranthoides Nutt. | 37 images |
| Pholistoma membranaceum (Benth.) Constance | 45 images |
| Phoradendron macrophyllum (Engelm.) Cockerell | 4 images |
| Phoradendron villosum (Nutt.) Nutt. ex Engelm. | 2 images |
| Photinia davidiana (Decne.) Cardot | 111 images |
| Phragmites australis (Cav.) Trin. ex Steud. | 7317 images |
| Phryma leptostachya L. | 177 images |
| Phyla cuneifolia (Torr.) Greene | 1 images |
| Phyla lanceolata (Michx.) Greene | 143 images |
| Phyla nodiflora (L.) Greene | 1826 images |
| Phyllodoce glanduliflora (Hook.) Coville | 21 images |
| Phyllospadix scouleri Hook. | 22 images |
| Phyllostachys aurea (André) Rivière & C.Rivière | 1622 images |
| Physalis heterophylla Nees | 160 images |
| Physalis longifolia Nutt. | 277 images |
| Physalis pumila Nutt. | 10 images |
| Physalis virginiana Mill. | 3 images |
| Physaria acutifolia Rydb. | 3 images |
| Physaria alpestris Suksd. | 1 images |
| Physaria alpina Rollins | 4 images |
| Physaria chambersii Rollins | 41 images |
| Physaria didymocarpa (Hook.) A.Gray | 1 images |
| Physaria fendleri (A.Gray) O'Kane & Al-Shehbaz | 1 images |
| Physocarpus alternans (M.E.Jones) J.T.Howell | 1 images |
| Physocarpus capitatus (Pursh) Kuntze | 531 images |
| Physocarpus malvaceus (Greene) Kuntze | 12 images |
| Physocarpus monogynus (Torr.) J.M.Coult. | 2 images |
| Phytolacca americana L. | 20754 images |
| Picea × albertiana S.Br. | 4 images |
| Picea breweriana S.Watson | 119 images |
| Picea engelmannii Parry ex Engelm. | 232 images |
| Picea laxa (Münchh.) Sarg. | 2032 images |
| Picea pungens Engelm. | 5982 images |
| Picea sitchensis (Bong.) Carrière | 1336 images |
| Picradeniopsis multiflora (Hook. & Arn.) B.G.Baldwin | 23 images |
| Picris hieracioides L. | 4954 images |
| Pilosella aurantiaca (L.) F.W.Schultz & Sch.Bip. | 9530 images |
| Pilosella caespitosa (Dumort.) P.D.Sell & C.West | 401 images |
| Pilosella officinarum Vaill. | 2961 images |
| Pilosella piloselloides (Vill.) Soják | 304 images |
| Pilularia americana A.Braun | 1 images |
| Pimpinella saxifraga L. | 2339 images |
| Pinus albicaulis Engelm. | 118 images |
| Pinus aristata Engelm. | 249 images |
| Pinus attenuata Lemmon | 69 images |
| Pinus contorta Douglas ex Loudon | 611 images |
| Pinus edulis Engelm. | 162 images |
| Pinus flexilis E.James | 69 images |
| Pinus jeffreyi Balf. | 53 images |
| Pinus lambertiana Douglas | 141 images |
| Pinus monophylla Torr. & Frém. | 42 images |
| Pinus monticola Douglas ex D.Don | 48 images |
| Pinus ponderosa Douglas ex C.Lawson | 534 images |
| Pistia stratiotes L. | 1047 images |
| Plagiobothrys bracteatus (Howell) I.M.Johnst. | 10 images |
| Plagiobothrys figuratus (Piper) I.M.Johnst. | 2 images |
| Plagiobothrys mollis (A.Gray) I.M.Johnst. | 6 images |
| Plagiobothrys nothofulvus (A.Gray) A.Gray | 54 images |
| Plagiobothrys scouleri (Hook. & Arn.) I.M.Johnst. | 1 images |
| Plagiobothrys stipitatus (Greene) I.M.Johnst. | 8 images |
| Plagiobothrys tenellus (Nutt.) A.Gray | 7 images |
| Plantago aristata Michx. | 26 images |
| Plantago coronopus L. | 2852 images |
| Plantago elongata Pursh | 17 images |
| Plantago eriopoda Torr. | 12 images |
| Plantago indica L. | 276 images |
| Plantago lanceolata L. | 14802 images |
| Plantago major L. | 11500 images |
| Plantago maritima L. | 990 images |
| Plantago patagonica Jacq. | 54 images |
| Plantago pusilla Nutt. | 10 images |
| Plantago rugelii Decne. | 263 images |
| Plantago subnuda Pilg. | 23 images |
| Plantago virginica L. | 191 images |
| Platanthera aquilonis Sheviak | 27 images |
| Platanthera clavellata (Michx.) Luer | 45 images |
| Platanthera dilatata (Pursh) Lindl. ex L.C.Beck | 7 images |
| Platanthera elegans Lindl. | 18 images |
| Platanthera ephemerantha R.M.Bateman | 1 images |
| Platanthera obtusata (Banks ex Pursh) Lindl. | 13 images |
| Platanthera orbiculata (Pursh) Lindl. | 55 images |
| Platanthera sparsiflora (S.Watson) Schltr. | 46 images |
| Platanthera stricta Lindl. | 22 images |
| Platystemon californicus Benth. | 207 images |
| Pleiacanthus spinosus (Nutt.) Rydb. | 33 images |
| Pleuricospora fimbriolata A.Gray | 6 images |
| Poa alpina L. | 424 images |
| Poa angustifolia L. | 4 images |
| Poa annua L. | 3219 images |
| Poa arida Vasey | 2 images |
| Poa bolanderi Vasey | 10 images |
| Poa bulbosa L. | 1256 images |
| Poa chambersii Soreng | 2 images |
| Poa compressa L. | 134 images |
| Poa confinis Vasey | 2 images |
| Poa curtifolia Scribn. | 4 images |
| Poa cusickii Vasey | 7 images |
| Poa fendleriana (Steud.) Vasey | 12 images |
| Poa glauca Vahl | 40 images |
| Poa infirma Kunth | 54 images |
| Poa laxiflora Buckley | 2 images |
| Poa leibergii Scribn. | 7 images |
| Poa leptocoma Trin. | 9 images |
| Poa macrantha Vasey | 1 images |
| Poa marcida Hitchc. | 1 images |
| Poa nemoralis L. | 519 images |
| Poa nervosa (Hook.) Vasey | 3 images |
| Poa occidentalis (Vasey) Vasey | 6 images |
| Poa palustris L. | 144 images |
| Poa pratensis L. | 3293 images |
| Poa rhizomata Hitchc. | 1 images |
| Poa secunda J.Presl | 9 images |
| Poa stenantha Trin. | 1 images |
| Poa tracyi Vasey | 7 images |
| Poa trivialis L. | 2169 images |
| Podagrostis humilis (Vasey) Björkman | 1 images |
| Pogogyne zizyphoroides Benth. | 2 images |
| Polemonium californicum Eastw. | 38 images |
| Polemonium carneum A.Gray | 32 images |
| Polemonium elegans Greene | 20 images |
| Polemonium foliosissimum A.Gray | 32 images |
| Polemonium micranthum Benth. | 4 images |
| Polemonium occidentale Greene | 103 images |
| Polemonium pulcherrimum Hook. | 102 images |
| Polemonium viscosum Nutt. | 41 images |
| Poliomintha incana (Torr.) A.Gray | 2 images |
| Polycarpon tetraphyllum (L.) L. | 1423 images |
| Polyctenium fremontii (S.Watson) Greene | 4 images |
| Polygala alba Nutt. | 27 images |
| Polygala senega L. | 29 images |
| Polygala verticillata L. | 5 images |
| Polygala vulgaris L. | 4513 images |
| Polygonatum biflorum (Walter) Elliott | 835 images |
| Polygonum arenastrum Boreau | 218 images |
| Polygonum aviculare L. | 5803 images |
| Polygonum douglasii Greene | 5 images |
| Polygonum majus (Meisn.) Piper | 2 images |
| Polygonum minimum S.Watson | 15 images |
| Polygonum parryi Greene | 1 images |
| Polygonum patulum M.Bieb. | 4 images |
| Polygonum plebeium R.Br. | 236 images |
| Polygonum polygaloides Meisn. | 1 images |
| Polygonum tenue Michx. | 3 images |
| Polypodium amorphum Suksd. | 9 images |
| Polypodium glycyrrhiza D.C.Eaton | 1 images |
| Polypodium hesperium Maxon | 12 images |
| Polypodium scouleri Hook. & Grev. | 29 images |
| Polypogon australis Brongn. | 8 images |
| Polypogon monspeliensis (L.) Desf. | 919 images |
| Polypogon viridis (Gouan) Breistr. | 268 images |
| Polystichum andersonii Hopkins | 3 images |
| Polystichum braunii (Spenn.) Fée | 200 images |
| Polystichum californicum (D.C.Eaton) Diels | 7 images |
| Polystichum imbricans (D.C.Eaton) D.H.Wagner | 46 images |
| Polystichum lemmonii Underw. | 20 images |
| Polystichum lonchitis (L.) Roth | 709 images |
| Polystichum munitum (Kaulf.) C.Presl | 965 images |
| Polystichum scopulinum (D.C.Eaton) Maxon | 9 images |
| Pombalia verticillata (Ortega) Paula-Souza | 9 images |
| Pontederia crassipes Mart. | 1763 images |
| Populus × generosa A.Henry | 15 images |
| Populus alba L. | 12851 images |
| Populus angustifolia E.James | 5 images |
| Populus balsamifera L. | 1971 images |
| Populus deltoides W.Bartram ex Marshall | 922 images |
| Populus fremontii S.Watson | 20 images |
| Populus tremuloides Michx. | 1600 images |
| Populus tristis Fisch. | 229 images |
| Portulaca grandiflora Hook. | 8113 images |
| Portulaca halimoides L. | 31 images |
| Portulaca oleracea L. | 13899 images |
| Potamogeton alpinus Balb. | 29 images |
| Potamogeton amplifolius Tuck. | 8 images |
| Potamogeton berchtoldii Fieber | 26 images |
| Potamogeton crispus L. | 193 images |
| Potamogeton diversifolius Raf. | 1 images |
| Potamogeton epihydrus Raf. | 4 images |
| Potamogeton foliosus Raf. | 5 images |
| Potamogeton friesii Rupr. | 9 images |
| Potamogeton gramineus L. | 49 images |
| Potamogeton natans L. | 656 images |
| Potamogeton nodosus Poir. | 349 images |
| Potamogeton obtusifolius Mert. & W.D.J.Koch | 17 images |
| Potamogeton perfoliatus L. | 193 images |
| Potamogeton praelongus Wulfen | 25 images |
| Potamogeton pusillus L. | 45 images |
| Potentilla anglica Laichard. | 943 images |
| Potentilla argentea L. | 3111 images |
| Potentilla biennis Greene | 5 images |
| Potentilla concinna Richardson | 8 images |
| Potentilla daucifolia Greene | 10 images |
| Potentilla douglasii Greene | 17 images |
| Potentilla drummondii Lehm. | 18 images |
| Potentilla flabellifolia Hook. ex Torr. & A.Gray | 1 images |
| Potentilla gracilis Douglas ex Hook. | 206 images |
| Potentilla hippiana Lehm. | 13 images |
| Potentilla hyparctica Malte | 2 images |
| Potentilla inclinata Vill. | 68 images |
| Potentilla indica (Andrews) Th.Wolf | 6039 images |
| Potentilla millefolia Rydb. | 19 images |
| Potentilla nivea L. | 30 images |
| Potentilla norvegica L. | 888 images |
| Potentilla pensylvanica L. | 21 images |
| Potentilla plattensis Nutt. | 1 images |
| Potentilla recta L. | 3941 images |
| Potentilla reptans L. | 11497 images |
| Potentilla sericata (S.Watson) Greene | 1 images |
| Potentilla supina L. | 212 images |
| Potentilla tilingii (Regel) Greene | 19 images |
| Potentilla tweedyi (Rydb.) J.T.Howell | 3 images |
| Pourthiaea villosa (Thunb.) Decne. | 85 images |
| Primula angustifolia Torr. | 12 images |
| Primula hendersonii (A.Gray) A.R.Mast & Reveal | 22 images |
| Primula jeffreyi (Van Houtte) A.R.Mast & Reveal | 48 images |
| Primula latiloba (A.Gray) A.R.Mast & Reveal | 3 images |
| Primula parryi A.Gray | 37 images |
| Primula pauciflora (Durand) A.R.Mast & Reveal | 52 images |
| Primula tetrandra (Suksd.) A.R.Mast & Reveal | 2 images |
| Proboscidea louisianica (Mill.) Thell. | 276 images |
| Prosartes hookeri Torr. | 149 images |
| Prosartes smithii (Hook.) Utech, Shinwari & Kawano | 73 images |
| Prosartes trachycarpa S.Watson | 48 images |
| Prosopis glandulosa Torr. | 501 images |
| Prunella vulgaris L. | 23300 images |
| Prunus × yedoensis Matsum. | 1661 images |
| Prunus americana Marshall | 87 images |
| Prunus amygdalus Batsch | 1081 images |
| Prunus angustifolia Marshall | 3 images |
| Prunus armeniaca L. | 6218 images |
| Prunus avium (L.) L. | 21351 images |
| Prunus cerasifera Ehrh. | 23833 images |
| Prunus cerasus L. | 11948 images |
| Prunus domestica L. | 18888 images |
| Prunus laurocerasus L. | 22340 images |
| Prunus lusitanica L. | 4947 images |
| Prunus mahaleb L. | 7316 images |
| Prunus padus L. | 14696 images |
| Prunus pensylvanica L.f. | 632 images |
| Prunus persica (L.) Batsch | 11309 images |
| Prunus pumila L. | 43 images |
| Prunus rivularis Scheele | 30 images |
| Prunus serotina Ehrh. | 9511 images |
| Prunus spinosa L. | 32532 images |
| Prunus subcordata Benth. | 12 images |
| Prunus virginiana L. | 3737 images |
| Psathyrotes annua (Nutt.) A.Gray | 9 images |
| Pseudognaphalium californicum (DC.) Anderb. | 235 images |
| Pseudognaphalium canescens (DC.) Anderb. | 2 images |
| Pseudognaphalium luteoalbum (L.) Hilliard & B.L.Burtt | 1413 images |
| Pseudognaphalium stramineum (Kunth) Anderb. | 119 images |
| Pseudognaphalium thermale (E.E.Nelson) G.L.Nesom | 1 images |
| Pseudotsuga menziesii (Mirb.) Franco | 4951 images |
| Psilocarphus brevissimus Nutt. | 36 images |
| Psilocarphus elatior A.Gray | 1 images |
| Psilocarphus oregonus Nutt. | 3 images |
| Psilocarphus tenellus Nutt. | 30 images |
| Ptelea trifoliata L. | 536 images |
| Pterospora andromedea Nutt. | 273 images |
| Puccinellia distans (Jacq.) Parl. | 106 images |
| Puccinellia maritima (Huds.) Parl. | 61 images |
| Puccinellia parishii Hitchc. | 2 images |
| Puccinellia rupestris (With.) Fernald & Weath. | 3 images |
| Pulsatilla occidentalis (S.Watson) Freyn | 6 images |
| Purshia stansburiana (Torr.) Henrard | 22 images |
| Purshia tridentata (Pursh) DC. | 197 images |
| Pyracantha coccinea M.Roem. | 16374 images |
| Pyracantha crenulata (D.Don) M.Roem. | 1976 images |
| Pyrola asarifolia Michx. | 133 images |
| Pyrola chlorantha Sw. | 383 images |
| Pyrola elliptica Nutt. | 174 images |
| Pyrola minor L. | 721 images |
| Pyrola picta Sm. | 126 images |
| Pyrrocoma carthamoides Hook. | 4 images |
| Pyrrocoma crocea (A.Gray) Greene | 26 images |
| Pyrrocoma lanceolata (Hook.) Greene | 1 images |
| Pyrrocoma uniflora (Hook.) Greene | 13 images |
| Pyrus communis L. | 11339 images |
| Pyrus nivalis Jacq. | 40 images |
| Quercus chrysolepis Liebm. | 158 images |
| Quercus gambelii Nutt. | 184 images |
| Quercus garryana Douglas ex Hook. | 197 images |
| Quercus grisea Liebm. | 16 images |
| Quercus kelloggii Newb. | 58 images |
| Quercus macrocarpa Michx. | 1543 images |
| Quercus robur L. | 18771 images |
| Quercus turbinella Greene | 94 images |
| Quercus vacciniifolia Hittell | 23 images |
| Quincula lobata (Torr.) Raf. | 53 images |
| Rafinesquia californica Nutt. | 32 images |
| Raillardella argentea A.Gray | 20 images |
| Raillardella scaposa A.Gray | 12 images |
| Rainiera stricta (Greene) Greene | 21 images |
| Ranunculus abortivus L. | 537 images |
| Ranunculus acris L. | 12778 images |
| Ranunculus adoneus A.Gray | 9 images |
| Ranunculus alismifolius Geyer ex Benth. | 60 images |
| Ranunculus arvensis L. | 480 images |
| Ranunculus bulbosus L. | 5262 images |
| Ranunculus californicus Benth. | 184 images |
| Ranunculus cupulatus (S.Watson) Christenh. & Byng | 5 images |
| Ranunculus digitatus Hook. | 4 images |
| Ranunculus eschscholtzii Schltdl. | 24 images |
| Ranunculus ficaria L. | 31104 images |
| Ranunculus flabellaris Raf. | 12 images |
| Ranunculus flammula L. | 2217 images |
| Ranunculus glaberrimus Hook. | 72 images |
| Ranunculus gmelinii DC. | 4 images |
| Ranunculus gormanii Greene | 3 images |
| Ranunculus hyperboreus Rottb. | 16 images |
| Ranunculus inamoenus Greene | 8 images |
| Ranunculus macounii Britton | 11 images |
| Ranunculus minimus (L.) E.H.L.Krause | 188 images |
| Ranunculus muricatus L. | 1100 images |
| Ranunculus occidentalis Nutt. | 69 images |
| Ranunculus orthorhynchus Hook. | 45 images |
| Ranunculus pensylvanicus L.f. | 2 images |
| Ranunculus populago Greene | 1 images |
| Ranunculus pygmaeus Wahlenb. | 16 images |
| Ranunculus repens L. | 15822 images |
| Ranunculus reptans L. | 10 images |
| Ranunculus sardous Crantz | 1059 images |
| Ranunculus sceleratus L. | 1553 images |
| Ranunculus sessilis (S.Watson) Christenh. & Byng | 3 images |
| Ranunculus trichophyllus Chaix | 561 images |
| Ranunculus uncinatus D.Don ex G.Don | 5 images |
| Raphanus raphanistrum L. | 14846 images |
| Rapistrum rugosum (L.) All. | 3369 images |
| Ratibida columnifera (Nutt.) Wooton & Standl. | 529 images |
| Reseda alba L. | 2076 images |
| Reseda lutea L. | 6697 images |
| Reseda luteola L. | 3371 images |
| Reynoutria × bohemica Chrtek & Chrtková | 167 images |
| Reynoutria japonica Houtt. | 11762 images |
| Reynoutria sachalinensis (F.Schmidt) Nakai | 2918 images |
| Rhamnus cathartica L. | 6080 images |
| Rhamnus crocea Nutt. | 158 images |
| Rhamphospermum arvense (L.) Andrz. ex Besser | 10694 images |
| Rhamphospermum nigrum (L.) Al-Shehbaz | 1000 images |
| Rheum rhabarbarum L. | 655 images |
| Rhinanthus minor L. | 3261 images |
| Rhinotropis californica (Nutt.) J.R.Abbott | 58 images |
| Rhinotropis subspinosa (S.Watson) J.R.Abbott | 2 images |
| Rhodiola integrifolia Raf. | 82 images |
| Rhodiola rhodantha (A.Gray) H.Jacobsen | 9 images |
| Rhododendron albiflorum Hook. | 38 images |
| Rhododendron columbianum (Piper) Harmaja | 79 images |
| Rhododendron groenlandicum (Oeder) Kron & Judd | 80 images |
| Rhododendron macrophyllum D.Don ex G.Don | 222 images |
| Rhododendron menziesii Craven | 29 images |
| Rhododendron occidentale (Torr. & A.Gray) A.Gray | 146 images |
| Rhus glabra L. | 2235 images |
| Rhus trilobata Nutt. | 27 images |
| Rhus typhina L. | 11694 images |
| Rhynchospora alba (L.) Vahl | 229 images |
| Rhynchospora capitellata (Michx.) Vahl | 4 images |
| Ribes acerifolium Howell | 2 images |
| Ribes americanum Mill. | 125 images |
| Ribes aureum Pursh | 1875 images |
| Ribes cereum Douglas | 179 images |
| Ribes divaricatum Douglas | 30 images |
| Ribes hudsonianum Richardson | 6 images |
| Ribes inerme Rydb. | 31 images |
| Ribes lacustre (Pers.) Poir. | 112 images |
| Ribes laxiflorum Pursh | 18 images |
| Ribes leptanthum A.Gray | 5 images |
| Ribes lobbii A.Gray | 1 images |
| Ribes menziesii Pursh | 27 images |
| Ribes montigenum McClatchie | 33 images |
| Ribes niveum Lindl. | 7 images |
| Ribes oxyacanthoides L. | 2 images |
| Ribes roezlii Regel | 68 images |
| Ribes rubrum L. | 6057 images |
| Ribes sanguineum Pursh | 6577 images |
| Ribes triste Pall. | 15 images |
| Ribes velutinum Greene | 21 images |
| Ribes viscosissimum Pursh | 24 images |
| Ribes wolfii Rothr. | 4 images |
| Rigiopappus leptocladus A.Gray | 8 images |
| Robinia hispida L. | 1687 images |
| Robinia neomexicana A.Gray | 38 images |
| Robinia pseudoacacia L. | 23516 images |
| Roemeria argemone (L.) C.Morales, R.Mend. & Romero García | 1476 images |
| Romanzoffia californica Greene | 21 images |
| Romanzoffia tracyi Jeps. | 1 images |
| Rorippa austriaca (Crantz) Besser | 195 images |
| Rorippa curvipes Greene | 10 images |
| Rorippa curvisiliqua (Hook.) Bessey ex Britton | 4 images |
| Rorippa dubia (Pers.) H.Hara | 12 images |
| Rorippa indica (L.) Hiern | 1 images |
| Rorippa palustris (L.) Besser | 1154 images |
| Rorippa sylvestris (L.) Besser | 2462 images |
| Rosa acicularis Lindl. | 30 images |
| Rosa arkansana Porter | 108 images |
| Rosa blanda Aiton | 65 images |
| Rosa bridgesii Crép. ex Rydb. | 27 images |
| Rosa californica Cham. & Schltdl. | 34 images |
| Rosa canina L. | 22218 images |
| Rosa glauca Pourr. | 1022 images |
| Rosa gymnocarpa Nutt. | 13 images |
| Rosa micrantha Borrer ex Sm. | 1359 images |
| Rosa multiflora Thunb. | 6116 images |
| Rosa nutkana C.Presl | 18 images |
| Rosa pisocarpa A.Gray | 2 images |
| Rosa rubiginosa L. | 4893 images |
| Rosa rugosa Thunb. | 11025 images |
| Rosa woodsii Lindl. | 1120 images |
| Rostraria cristata (L.) Tzvelev | 714 images |
| Rotala ramosior (L.) Koehne | 9 images |
| Rubus allegheniensis Porter | 77 images |
| Rubus arcticus L. | 124 images |
| Rubus armeniacus Focke | 1715 images |
| Rubus deliciosus Torr. | 124 images |
| Rubus hispidus L. | 130 images |
| Rubus idaeus L. | 7931 images |
| Rubus illecebrosus Focke | 84 images |
| Rubus leucodermis (Douglas ex Hook.) Douglas ex Torr. & A.Gray | 3 images |
| Rubus nemoralis P.J.Müll. | 1205 images |
| Rubus nivalis Douglas ex Hook. | 15 images |
| Rubus occidentalis L. | 3743 images |
| Rubus odoratus L. | 1731 images |
| Rubus pedatus Sm. | 41 images |
| Rubus pensilvanicus Poir. | 47 images |
| Rubus pubescens Raf. | 165 images |
| Rubus spectabilis Pursh | 1281 images |
| Rubus ulmifolius Schott | 12402 images |
| Rubus ursinus Cham. & Schltdl. | 258 images |
| Rubus vestitus Weihe | 634 images |
| Rudbeckia alpicola Piper | 1 images |
| Rudbeckia glaucescens Eastw. | 8 images |
| Rudbeckia hirta L. | 6089 images |
| Rudbeckia laciniata L. | 2969 images |
| Rudbeckia occidentalis Nutt. | 79 images |
| Rudbeckia triloba L. | 1485 images |
| Rumex × acutus L. | 2103 images |
| Rumex acetosa L. | 7149 images |
| Rumex acetosella L. | 5745 images |
| Rumex altissimus Alph.Wood | 13 images |
| Rumex conglomeratus Murray | 3320 images |
| Rumex crispus L. | 10497 images |
| Rumex dentatus L. | 28 images |
| Rumex hymenosepalus Torr. | 93 images |
| Rumex obtusifolius L. | 13597 images |
| Rumex occidentalis S.Watson | 4 images |
| Rumex patientia L. | 3306 images |
| Rumex paucifolius Nutt. | 13 images |
| Rumex pulcher L. | 2443 images |
| Rumex sanguineus L. | 1688 images |
| Rumex stenophyllus Ledeb. | 1 images |
| Rumex venosus Pursh | 12 images |
| Ruppia cirrhosa (Petagna) Grande | 36 images |
| Ruppia maritima L. | 29 images |
| Sabulina douglasii (Fenzl ex Torr. & A.Gray) Dillenb. & Kadereit | 12 images |
| Sabulina rubella (Wahlenb.) Dillenb. & Kadereit | 1 images |
| Sabulina stricta (Sw.) Rchb. | 3 images |
| Sagina apetala Ard. | 241 images |
| Sagina japonica (Sw.) Ohwi | 4 images |
| Sagina maxima A.Gray | 10 images |
| Sagina procumbens L. | 1079 images |
| Sagina saginoides (L.) H.Karst. | 92 images |
| Sagittaria graminea Michx. | 83 images |
| Sagittaria latifolia Willd. | 814 images |
| Sagittaria montevidensis Cham. & Schltdl. | 164 images |
| Sagittaria rigida Pursh | 9 images |
| Sairocarpus kingii (S.Watson) D.A.Sutton | 1 images |
| Sairocarpus vexillocalyculatus (Kellogg) D.A.Sutton | 1 images |
| Salicornia perennis Mill. | 110 images |
| Salicornia rubra A.Nelson | 18 images |
| Salicornia virginica L. | 11 images |
| Salix × fragilis L. | 96 images |
| Salix alba L. | 10927 images |
| Salix amygdaloides Andersson | 33 images |
| Salix arctica Pall. | 23 images |
| Salix babylonica L. | 6735 images |
| Salix barrattiana Hook. | 4 images |
| Salix bebbiana Sarg. | 46 images |
| Salix boothii Dorn | 1 images |
| Salix brachycarpa Nutt. | 1 images |
| Salix candida Flüggé ex Willd. | 7 images |
| Salix caprea L. | 13180 images |
| Salix cascadensis Cockerell | 1 images |
| Salix commutata Bebb | 11 images |
| Salix discolor Muhl. | 478 images |
| Salix drummondiana Barratt ex Hook. | 2 images |
| Salix eastwoodiae Cockerell ex A.Heller | 1 images |
| Salix exigua Nutt. | 273 images |
| Salix geyeriana Andersson | 5 images |
| Salix glauca L. | 221 images |
| Salix gooddingii C.R.Ball | 6 images |
| Salix hookeriana Barratt ex Hook. | 16 images |
| Salix interior Rowlee | 8 images |
| Salix irrorata Andersson | 3 images |
| Salix laevigata Bebb | 40 images |
| Salix lasiandra Benth. | 3 images |
| Salix lasiolepis Benth. | 183 images |
| Salix lemmonii Bebb | 2 images |
| Salix lucida Muhl. | 77 images |
| Salix lutea Nutt. | 2 images |
| Salix melanopsis Nutt. | 8 images |
| Salix nivalis Hook. | 10 images |
| Salix pentandra L. | 1352 images |
| Salix petrophila Rydb. | 34 images |
| Salix planifolia Pursh | 9 images |
| Salix prolixa Andersson | 15 images |
| Salix purpurea L. | 3568 images |
| Salix reticulata L. | 505 images |
| Salix rotundifolia Trautv. | 1 images |
| Salix scouleriana Barratt ex Hook. | 20 images |
| Salix sitchensis Sanson ex Bong. | 48 images |
| Salix vestita Pursh | 5 images |
| Salsola tragus L. | 66 images |
| Salvia × sylvestris L. | 1577 images |
| Salvia aethiopis L. | 404 images |
| Salvia azurea Michx. ex Vahl | 103 images |
| Salvia dorrii (Kellogg) Abrams | 79 images |
| Salvia officinalis L. | 12493 images |
| Salvia pratensis L. | 17304 images |
| Salvia reflexa Hornem. | 34 images |
| Salvia sclarea L. | 4427 images |
| Salvinia molesta D.Mitch. | 43 images |
| Sambucus canadensis L. | 5731 images |
| Sambucus cerulea Raf. | 13 images |
| Sambucus racemosa L. | 9597 images |
| Samolus parviflorus Raf. | 2 images |
| Sandbergia whitedii (Piper) Greene | 3 images |
| Sanguisorba minor Scop. | 9197 images |
| Sanguisorba officinalis L. | 3886 images |
| Sanicula arctopoides Hook. & Arn. | 122 images |
| Sanicula bipinnatifida Douglas | 211 images |
| Sanicula canadensis L. | 522 images |
| Sanicula crassicaulis Poepp. ex DC. | 215 images |
| Sanicula graveolens Poepp. ex DC. | 18 images |
| Sanicula laciniata Hook. & Arn. | 30 images |
| Sanicula marilandica L. | 33 images |
| Sanicula tuberosa Torr. | 16 images |
| Saponaria ocymoides L. | 6721 images |
| Saponaria officinalis L. | 18186 images |
| Sarcobatus vermiculatus (Hook.) Torr. | 46 images |
| Sarcodes sanguinea Torr. | 303 images |
| Sarracenia flava L. | 521 images |
| Sarracenia leucophylla Raf. | 492 images |
| Sarracenia purpurea L. | 1344 images |
| Saussurea americana Eaton | 6 images |
| Saxifraga adscendens L. | 45 images |
| Saxifraga bronchialis L. | 56 images |
| Saxifraga cernua L. | 32 images |
| Saxifraga cespitosa L. | 106 images |
| Saxifraga chrysantha A.Gray | 3 images |
| Saxifraga hirculus L. | 125 images |
| Saxifraga oppositifolia L. | 1183 images |
| Saxifraga tridactylites L. | 1465 images |
| Scabiosa atropurpurea L. | 5947 images |
| Scabrethia scabra (Hook.) W.A.Weber | 13 images |
| Scandix pecten-veneris L. | 2851 images |
| Scandosorbus intermedia (Ehrh.) Sennikov | 4521 images |
| Scheuchzeria palustris L. | 127 images |
| Schizachyrium scoparium (Michx.) Nash | 86 images |
| Schoenoplectiella mucronata (L.) J.Jung & H.K.Choi | 39 images |
| Schoenoplectus pungens (Vahl) Palla | 65 images |
| Schoenoplectus tabernaemontani (C.C.Gmel.) Palla | 91 images |
| Schoenoplectus triqueter (L.) Palla | 81 images |
| Scirpus atrovirens Willd. | 217 images |
| Scirpus cyperinus (L.) Kunth | 149 images |
| Scirpus microcarpus J.Presl & C.Presl | 4 images |
| Scirpus pendulus Muhl. | 32 images |
| Scleranthus annuus L. | 319 images |
| Sclerocactus cloverae K.D.Heil & J.M.Porter | 1 images |
| Sclerocactus glaucus (K.Schum.) L.D.Benson | 3 images |
| Sclerocactus parviflorus Clover & Jotter | 22 images |
| Sclerochloa dura (L.) P.Beauv. | 62 images |
| Scoliopus hallii S.Watson | 1 images |
| Scorzonera laciniata L. | 650 images |
| Scorzoneroides autumnalis (L.) Moench | 3375 images |
| Scrophularia californica Cham. & Schltdl. | 51 images |
| Scrophularia lanceolata Pursh | 18 images |
| Scutellaria angustifolia Pursh | 4 images |
| Scutellaria antirrhinoides Benth. | 12 images |
| Scutellaria brittonii Porter | 2 images |
| Scutellaria galericulata L. | 1514 images |
| Scutellaria lateriflora L. | 110 images |
| Scutellaria tuberosa Benth. | 75 images |
| Secale cereale L. | 3659 images |
| Sedum acre L. | 8130 images |
| Sedum album L. | 10917 images |
| Sedum divergens S.Watson | 23 images |
| Sedum lanceolatum Torr. | 98 images |
| Sedum laxum (Britton) A.Berger | 56 images |
| Sedum oblanceolatum R.T.Clausen | 2 images |
| Sedum oreganum Nutt. | 117 images |
| Sedum oregonense (S.Watson) M.E.Peck | 30 images |
| Sedum pumilum Benth. | 4 images |
| Sedum spathulifolium Hook. | 1519 images |
| Sedum stelliforme S.Watson | 10 images |
| Sedum stenopetalum Pursh | 21 images |
| Selaginella douglasii (Hook. & Grev.) Spring | 10 images |
| Selaginella selaginoides (L.) P.Beauv. ex Schrank & Mart. | 166 images |
| Senecio aronicoides DC. | 19 images |
| Senecio atratus Greene | 31 images |
| Senecio bigelovii A.Gray | 10 images |
| Senecio eremophilus Richardson | 2 images |
| Senecio flaccidus Less. | 156 images |
| Senecio hydrophilus Nutt. | 6 images |
| Senecio integerrimus Nutt. | 153 images |
| Senecio lugens Richardson | 3 images |
| Senecio minimus Poir. | 168 images |
| Senecio riddellii Torr. & A.Gray | 4 images |
| Senecio serra Hook. | 11 images |
| Senecio soldanella A.Gray | 3 images |
| Senecio spartioides Torr. & A.Gray | 23 images |
| Senecio sylvaticus L. | 2466 images |
| Senecio taraxacoides Greene | 1 images |
| Senecio triangularis Hook. | 280 images |
| Senecio vulgaris L. | 9645 images |
| Senecio wootonii Greene | 11 images |
| Sequoia sempervirens (D.Don) Endl. | 3646 images |
| Sericocarpus oregonensis Nutt. | 11 images |
| Sesuvium revolutifolium Ortega | 41 images |
| Setaria adhaerens (Forssk.) Chiov. | 14 images |
| Setaria italica (L.) P.Beauv. | 1583 images |
| Setaria leucopila (Scribn. & Merr.) K.Schum. | 3 images |
| Setaria parviflora (Poir.) Kerguélen | 192 images |
| Setaria pumila (Poir.) Roem. & Schult. | 3254 images |
| Setaria verticillata (L.) P.Beauv. | 1551 images |
| Setaria viridis (L.) P.Beauv. | 256 images |
| Setaria vulpiseta (Lam.) Roem. & Schult. | 15 images |
| Shepherdia argentea (Pursh) Nutt. | 63 images |
| Shepherdia canadensis (L.) Nutt. | 177 images |
| Sibbaldia procumbens L. | 202 images |
| Sidalcea campestris Greene | 40 images |
| Sidalcea candida A.Gray | 21 images |
| Sidalcea cusickii Piper | 48 images |
| Sidalcea diploscypha (Torr. & A.Gray) A.Gray ex Benth. | 1 images |
| Sidalcea hendersonii S.Watson | 3 images |
| Sidalcea hickmanii Greene | 6 images |
| Sidalcea hirtipes C.L.Hitchc. | 4 images |
| Sidalcea malviflora (DC.) A.Gray | 170 images |
| Sidalcea nelsoniana Piper | 12 images |
| Sidalcea neomexicana A.Gray | 39 images |
| Sidalcea oregana (Nutt.) A.Gray | 4 images |
| Silene acaulis (L.) Jacq. | 3195 images |
| Silene antirrhina L. | 15 images |
| Silene bridgesii Rohrb. | 7 images |
| Silene chalcedonica (L.) E.H.L.Krause | 1244 images |
| Silene conica L. | 590 images |
| Silene conoidea L. | 14 images |
| Silene coronaria (L.) Clairv. | 7323 images |
| Silene csereii Baumg. | 4 images |
| Silene dichotoma Ehrh. | 1626 images |
| Silene dioica (L.) Clairv. | 18605 images |
| Silene douglasii Hook. | 51 images |
| Silene flos-cuculi (L.) Greuter & Burdet | 7959 images |
| Silene gallica L. | 1843 images |
| Silene grayi S.Watson | 8 images |
| Silene hookeri Nutt. | 12 images |
| Silene latifolia Poir. | 20553 images |
| Silene lemmonii S.Watson | 26 images |
| Silene noctiflora L. | 2209 images |
| Silene oregana S.Watson | 4 images |
| Silene parryi (S.Watson) C.L.Hitchc. & Maguire | 1 images |
| Silene pendula L. | 2230 images |
| Silene sargentii S.Watson | 8 images |
| Silene scouleri Hook. | 3 images |
| Silene suksdorfii B.L.Rob. | 1 images |
| Silene uralensis (Rupr.) Bocquet | 16 images |
| Silene verecunda S.Watson | 5 images |
| Silene vulgaris (Moench) Garcke | 16648 images |
| Silphium integrifolium Michx. | 133 images |
| Silybum marianum (L.) Gaertn. | 9731 images |
| Sinapis alba L. | 6755 images |
| Sison segetum L. | 49 images |
| Sisymbrium altissimum L. | 376 images |
| Sisymbrium irio L. | 2535 images |
| Sisymbrium loeselii L. | 1625 images |
| Sisymbrium officinale (L.) Scop. | 6260 images |
| Sisymbrium orientale L. | 347 images |
| Sisyrinchium angustifolium Mill. | 1043 images |
| Sisyrinchium bellum S.Watson | 22 images |
| Sisyrinchium californicum (Ker Gawl.) Dryand. | 91 images |
| Sisyrinchium halophilum Greene | 27 images |
| Sisyrinchium idahoense E.P.Bicknell | 8 images |
| Sisyrinchium montanum Greene | 177 images |
| Sium suave Walter | 71 images |
| Smilax lasioneura Hook. | 13 images |
| Smithiastrum prenanthoides (Durand) Morin | 14 images |
| Solanum aethiopicum L. | 179 images |
| Solanum alatum Moench | 3 images |
| Solanum americanum Mill. | 6171 images |
| Solanum aviculare G.Forst. | 296 images |
| Solanum carolinense L. | 1762 images |
| Solanum crispum Ruiz & Pav. | 353 images |
| Solanum dulcamara L. | 16059 images |
| Solanum elaeagnifolium Cav. | 1772 images |
| Solanum furcatum Dunal | 11 images |
| Solanum lycopersicum L. | 16861 images |
| Solanum nigrum L. | 14077 images |
| Solanum rostratum Dunal | 586 images |
| Solanum sarrachoides Sendtn. | 5 images |
| Solanum sisymbriifolium Lam. | 1067 images |
| Solanum triflorum Nutt. | 76 images |
| Solanum umbelliferum Eschsch. | 290 images |
| Solanum villosum Mill. | 2520 images |
| Solidago altissima L. | 948 images |
| Solidago canadensis L. | 14776 images |
| Solidago gigantea Aiton | 7581 images |
| Solidago missouriensis Nutt. | 36 images |
| Solidago mollis Bartl. | 5 images |
| Solidago multiradiata Aiton | 48 images |
| Solidago nemoralis Aiton | 194 images |
| Solidago ptarmicoides (Torr. & A.Gray) B.Boivin | 20 images |
| Solidago rigida L. | 221 images |
| Solidago simplex Kunth | 28 images |
| Solidago velutina DC. | 104 images |
| Soliva sessilis Ruiz & Pav. | 162 images |
| Sonchus arvensis L. | 5969 images |
| Sonchus asper (L.) Hill | 14455 images |
| Sonchus oleraceus L. | 14480 images |
| Sorbaria kirilowii (Regel) Maxim. | 81 images |
| Sorbaria sorbifolia (L.) A.Braun | 3288 images |
| Sorbus aucuparia L. | 21189 images |
| Sorbus californica Greene | 25 images |
| Sorbus scopulina Greene | 58 images |
| Sorbus sitchensis M.Roem. | 2 images |
| Sorghastrum nutans (L.) Nash | 194 images |
| Sorghum × drummondii (Nees ex Steud.) Millsp. & Chase | 3 images |
| Sorghum bicolor (L.) Moench | 2488 images |
| Sorghum halepense (L.) Pers. | 3363 images |
| Sparganium angustifolium Michx. | 277 images |
| Sparganium emersum Rehmann | 206 images |
| Sparganium eurycarpum Engelm. | 50 images |
| Sparganium natans L. | 51 images |
| Spartium junceum L. | 6757 images |
| Spergula arvensis L. | 1241 images |
| Spergularia bocconei (Scheele) Graebn. | 68 images |
| Spergularia canadensis (Pers.) G.Don | 1 images |
| Spergularia diandra (Guss.) Heldr. | 43 images |
| Spergularia macrotheca (Hornem. ex Cham. & Schltdl.) Heynh. | 1 images |
| Spergularia marina (L.) Besser | 694 images |
| Spergularia media (L.) C.Presl | 351 images |
| Spergularia rubra (L.) J.Presl & C.Presl | 1610 images |
| Sphaeralcea angustifolia (Cav.) G.Don | 32 images |
| Sphaeralcea coccinea (Nutt.) Rydb. | 193 images |
| Sphaeralcea fendleri A.Gray | 7 images |
| Sphaeralcea munroana (Douglas ex Lindl.) Spach | 1 images |
| Sphaeralcea parvifolia A.Nelson | 20 images |
| Sphaerophysa salsula (Pall.) DC. | 18 images |
| Sphenopholis intermedia (Rydb.) Rydb. | 9 images |
| Sphenopholis obtusata (Michx.) Scribn. | 9 images |
| Spinacia oleracea L. | 1760 images |
| Spiraea douglasii Hook. | 3997 images |
| Spiraea splendens Baumann ex K.Koch | 7 images |
| Spiraea tomentosa L. | 860 images |
| Spiranthes diluvialis Sheviak | 5 images |
| Spiranthes porrifolia Lindl. | 13 images |
| Spiranthes romanzoffiana Cham. | 101 images |
| Spirodela polyrhiza (L.) Schleid. | 207 images |
| Sporobolus × townsendii (H.Groves & J.Groves) P.M.Peterson & Saarela | 12 images |
| Sporobolus airoides (Torr.) Torr. | 25 images |
| Sporobolus alopecuroides (Piller & Mitterp.) P.M.Peterson | 55 images |
| Sporobolus alterniflorus (Loisel.) P.M.Peterson & Saarela | 81 images |
| Sporobolus anglicus (C.E.Hubb.) P.M.Peterson & Saarela | 86 images |
| Sporobolus cryptandrus (Torr.) A.Gray | 9 images |
| Sporobolus heterolepis (A.Gray) A.Gray | 15 images |
| Sporobolus hookerianus P.M.Peterson & Saarela | 4 images |
| Sporobolus indicus (L.) R.Br. | 477 images |
| Sporobolus michauxianus (Hitchc.) P.M.Peterson & Saarela | 82 images |
| Sporobolus neglectus Nash | 2 images |
| Sporobolus niliacus (Fig. & De Not.) P.M.Peterson | 4 images |
| Sporobolus pumilus (Roth) P.M.Peterson & Saarela | 58 images |
| Sporobolus pyramidatus (Lam.) Hitchc. | 4 images |
| Sporobolus rigidus (Buckley) P.M.Peterson | 7 images |
| Sporobolus schoenoides (L.) P.M.Peterson | 88 images |
| Sporobolus vaginiflorus (Torr. ex A.Gray) Alph.Wood | 8 images |
| Stachys ajugoides Benth. | 41 images |
| Stachys arvensis (L.) L. | 635 images |
| Stachys byzantina K.Koch | 8618 images |
| Stachys chamissonis Benth. | 90 images |
| Stachys mexicana Benth. | 10 images |
| Stachys palustris L. | 6001 images |
| Stachys pilosa Nutt. | 18 images |
| Stachys rigida Nutt. ex Benth. | 34 images |
| Stanleya pinnata (Pursh) Britton | 96 images |
| Stanleya viridiflora Nutt. | 3 images |
| Stellaria alsine Grimm | 279 images |
| Stellaria americana (Porter ex B.L.Rob.) Standl. | 1 images |
| Stellaria apetala Ucria | 179 images |
| Stellaria aquatica (L.) Scop. | 1744 images |
| Stellaria borealis Bigelow | 3 images |
| Stellaria crassifolia Ehrh. | 20 images |
| Stellaria graminea L. | 4954 images |
| Stellaria longifolia Muhl. ex Willd. | 15 images |
| Stellaria longipes Goldie | 26 images |
| Stellaria media (L.) Vill. | 12799 images |
| Stellaria nitens Nutt. | 5 images |
| Stellaria obtusa Engelm. | 2 images |
| Stenaria nigricans (Lam.) Terrell | 109 images |
| Stenotus acaulis (Nutt.) Nutt. | 48 images |
| Stenotus armerioides Nutt. | 14 images |
| Stephanomeria exigua Nutt. | 22 images |
| Stephanomeria lactucina A.Gray | 1 images |
| Stephanomeria malheurensis Gottlieb | 1 images |
| Stephanomeria pauciflora (Torr.) A.Nelson | 1 images |
| Stephanomeria tenuifolia (Torr.) H.M.Hall | 1 images |
| Stephanomeria virgata Benth. | 44 images |
| Stillingia sylvatica L. | 32 images |
| Streptanthus cordatus Nutt. | 10 images |
| Streptanthus glandulosus Hook. | 80 images |
| Streptanthus lasiophyllus (Hook. & Arn.) Hoover | 1 images |
| Streptanthus pilosus (S.Watson) Jeps. | 1 images |
| Streptanthus tortuosus Kellogg | 94 images |
| Streptopus amplexifolius (L.) DC. | 614 images |
| Streptopus lanceolatus (Aiton) Reveal | 112 images |
| Streptopus streptopoides (Ledeb.) Frye & Rigg | 10 images |
| Strigosella africana (L.) Botsch. | 170 images |
| Stuckenia filiformis (Pers.) Börner | 5 images |
| Stuckenia pectinata (L.) Börner | 148 images |
| Stuckenia striata (Ruiz & Pav.) Holub | 2 images |
| Suaeda calceoliformis (Hook.) Moq. | 1 images |
| Suaeda nigra (Raf.) J.F.Macbr. | 1 images |
| Subularia aquatica L. | 27 images |
| Suksdorfia violacea A.Gray | 3 images |
| Swertia perennis L. | 697 images |
| Symphoricarpos albus (L.) S.F.Blake | 11291 images |
| Symphoricarpos longiflorus A.Gray | 23 images |
| Symphoricarpos occidentalis (R.Br.) Hook. | 70 images |
| Symphoricarpos oreophilus A.Gray | 15 images |
| Symphoricarpos rotundifolius A.Gray | 44 images |
| Symphyotrichum chilense (Nees) G.L.Nesom | 8 images |
| Symphyotrichum ericoides (L.) G.L.Nesom | 2071 images |
| Symphyotrichum foliaceum (Lindl. ex DC.) G.L.Nesom | 1 images |
| Symphyotrichum laeve (L.) Á.Löve & D.Löve | 251 images |
| Symphyotrichum lanceolatum (Willd.) G.L.Nesom | 3457 images |
| Symphyotrichum novae-angliae (L.) G.L.Nesom | 3237 images |
| Symphyotrichum oblongifolium (Nutt.) G.L.Nesom | 93 images |
| Symphyotrichum spathulatum (Lindl.) G.L.Nesom | 4 images |
| Symphyotrichum subspicatum (Nees) G.L.Nesom | 26 images |
| Symphytum × uplandicum Nyman | 617 images |
| Symphytum asperum Lepech. | 2966 images |
| Symphytum officinale L. | 20871 images |
| Synedrella nodiflora (L.) Gaertn. | 595 images |
| Syringa vulgaris L. | 21284 images |
| Taeniatherum caput-medusae (L.) Nevski | 100 images |
| Tagetes erecta L. | 14588 images |
| Tamarix chinensis Lour. | 223 images |
| Tamarix parviflora DC. | 3241 images |
| Tamarix ramosissima Ledeb. | 1908 images |
| Tanacetum balsamita L. | 599 images |
| Tanacetum bipinnatum Sch.Bip. | 32 images |
| Tanacetum parthenium (L.) Sch.Bip. | 9326 images |
| Tanacetum vulgare L. | 19453 images |
| Taraxacum erythrospermum Andrz. ex Besser | 1197 images |
| Taraxacum sect. Taraxacum F.H.Wigg. | 14692 images |
| Taraxia breviflora (Torr. & A.Gray) Nutt. ex Small | 1 images |
| Taraxia ovata (Nutt.) Small | 31 images |
| Taraxia subacaulis (Pursh) Rydb. | 3 images |
| Taraxia tanacetifolia (Torr. & A.Gray) Piper | 1 images |
| Tauschia howellii (J.M.Coult. & Rose) J.F.Macbr. | 3 images |
| Tauschia kelloggii (A.Gray) J.F.Macbr. | 13 images |
| Tauschia stricklandii (J.M.Coult. & Rose) Mathias & Constance | 2 images |
| Taxus brevifolia Nutt. | 1286 images |
| Teesdalia nudicaulis (L.) W.T.Aiton | 37 images |
| Telesonix jamesii (Torr.) Raf. | 14 images |
| Tellima grandiflora (Pursh) Douglas ex Lindl. | 1407 images |
| Tetradymia canescens DC. | 88 images |
| Tetragonia tetragonoides (Pall.) Kuntze | 655 images |
| Tetraneuris acaulis Greene | 25 images |
| Tetraneuris ivesiana Greene | 3 images |
| Tetraneuris scaposa (DC.) Greene | 131 images |
| Teucrium canadense L. | 657 images |
| Teucrium laciniatum Torr. | 25 images |
| Thalictrum alpinum L. | 68 images |
| Thalictrum dasycarpum Fisch., C.A.Mey. & Avé-Lall. | 10 images |
| Thalictrum fendleri Engelm. ex A.Gray | 62 images |
| Thalictrum occidentale A.Gray | 37 images |
| Thalictrum revolutum DC. | 25 images |
| Thalictrum venulosum Trel. | 1 images |
| Thelesperma filifolium (Hook.) A.Gray | 4 images |
| Thelesperma megapotamicum (Spreng.) Herter | 45 images |
| Thelypodium brachycarpum (Torr.) Torr. | 1 images |
| Thelypodium flexuosum B.L.Rob. | 2 images |
| Thelypodium howellii S.Watson | 1 images |
| Thelypodium integrifolium (Nutt.) Endl. | 2 images |
| Thelypodium laciniatum (Hook.) Endl. | 2 images |
| Thelypodium milleflorum A.Nelson | 5 images |
| Thermopsis gracilis Howell | 23 images |
| Thermopsis montana Nutt. | 18 images |
| Thermopsis rhombifolia (Pursh) Richardson | 1 images |
| Thesium ramosum Hayne | 11 images |
| Thinopyrum acutum (DC.) Banfi | 52 images |
| Thinopyrum elongatum (Host) D.R.Dewey | 21 images |
| Thinopyrum intermedium (Host) Barkworth & D.R.Dewey | 19 images |
| Thinopyrum junceum (L.) Á.Löve | 222 images |
| Thlaspi arvense L. | 2901 images |
| Thuja plicata Donn ex D.Don | 3158 images |
| Thymelaea passerina (L.) Coss. & Germ. | 77 images |
| Thymus pulegioides L. | 2849 images |
| Thysanocarpus curvipes Hook. | 70 images |
| Thysanocarpus radians Benth. | 16 images |
| Tiarella trifoliata L. | 167 images |
| Tidestromia lanuginosa (Nutt.) Standl. | 25 images |
| Tiquilia nuttallii (Hook.) A.T.Richardson | 1 images |
| Tofieldia pusilla (Michx.) Pers. | 90 images |
| Tolmiea menziesii (Pursh) Torr. & A.Gray | 72 images |
| Tomostima cuneifolia (Nutt.) Al-Shehbaz, M.Koch & Jordon-Thaden | 1 images |
| Torilis africana Spreng. | 80 images |
| Torilis arvensis (Huds.) Link | 5511 images |
| Torilis japonica (Houtt.) DC. | 2009 images |
| Torilis nodosa (L.) Gaertn. | 997 images |
| Torilis scabra (Thunb.) DC. | 1 images |
| Torminalis glaberrima (Gand.) Sennikov & Kurtto | 4591 images |
| Torreyochloa pallida (Torr.) Church | 10 images |
| Tournefortia sibirica L. | 18 images |
| Townsendia exscapa (Richardson) Porter | 12 images |
| Townsendia fendleri A.Gray | 2 images |
| Townsendia hookeri Beaman | 10 images |
| Townsendia incana Nutt. | 9 images |
| Townsendia parryi Eaton | 4 images |
| Townsendia rothrockii A.Gray ex Rothrock. | 2 images |
| Townsendia spathulata Nutt. | 3 images |
| Toxicodendron diversilobum (Torr. & A.Gray) Greene | 1368 images |
| Toxicodendron rydbergii (Small ex Rydb.) Greene | 141 images |
| Toxicoscordion fremontii (Torr.) Rydb. | 53 images |
| Toxicoscordion micranthum (Eastw.) A.Heller | 1 images |
| Toxicoscordion paniculatum (Nutt.) Rydb. | 23 images |
| Toxicoscordion venenosum (S.Watson) Rydb. | 47 images |
| Tradescantia bracteata Small ex Britton | 8 images |
| Tradescantia occidentalis (Britton) Smyth | 122 images |
| Tragia ramosa Torr. | 41 images |
| Tragopogon dubius Scop. | 6741 images |
| Tragopogon porrifolius L. | 5055 images |
| Tragopogon pratensis L. | 9047 images |
| Trautvetteria caroliniensis (Walter) Vail | 40 images |
| Triantha glutinosa (Michx.) Baker | 46 images |
| Trianthema portulacastrum L. | 323 images |
| Tribulus terrestris L. | 2470 images |
| Trichophorum alpinum (L.) Pers. | 137 images |
| Trichophorum cespitosum (L.) Hartm. | 414 images |
| Trichophorum pumilum (Vahl) Schinz & Thell. | 19 images |
| Trichostema lanceolatum Benth. | 129 images |
| Trichostema laxum A.Gray | 1 images |
| Trichostema oblongum Benth. | 14 images |
| Trichostema simulatum Jeps. | 4 images |
| Tridentopsis mutica (Torr.) P.M.Peterson | 3 images |
| Trifolium angustifolium L. | 1815 images |
| Trifolium arvense L. | 3998 images |
| Trifolium attenuatum Greene | 4 images |
| Trifolium aureum Pollich | 1031 images |
| Trifolium barbigerum Torr. | 20 images |
| Trifolium campestre Schreb. | 4465 images |
| Trifolium cernuum Brot. | 11 images |
| Trifolium ciliolatum Benth. | 28 images |
| Trifolium depauperatum Desv. | 44 images |
| Trifolium dubium Sibth. | 3739 images |
| Trifolium fragiferum L. | 1401 images |
| Trifolium fucatum Lindl. | 64 images |
| Trifolium glomeratum L. | 170 images |
| Trifolium hirtum All. | 339 images |
| Trifolium hybridum L. | 1842 images |
| Trifolium incarnatum L. | 7601 images |
| Trifolium macrocephalum (Pursh) Poir. | 27 images |
| Trifolium microcephalum Pursh | 5 images |
| Trifolium nanum Torr. | 12 images |
| Trifolium oliganthum Steud. | 5 images |
| Trifolium pratense L. | 19018 images |
| Trifolium repens L. | 13355 images |
| Trifolium resupinatum L. | 1525 images |
| Trifolium striatum L. | 254 images |
| Trifolium subterraneum L. | 660 images |
| Trifolium vesiculosum Savi | 93 images |
| Trifolium willdenovii Spreng. | 59 images |
| Trifolium wormskioldii Lehm. | 53 images |
| Triglochin maritima L. | 398 images |
| Triglochin palustris L. | 167 images |
| Trillium albidum J.D.Freeman | 11 images |
| Trillium kurabayashii J.D.Freeman | 21 images |
| Trillium ovatum Pursh | 536 images |
| Trillium petiolatum Pursh | 3 images |
| Triodanis perfoliata (L.) Nieuwl. | 628 images |
| Triphysaria eriantha (Benth.) T.I.Chuang & Heckard | 1 images |
| Triphysaria pusilla (Benth.) T.I.Chuang & Heckard | 3 images |
| Triphysaria versicolor Fisch. & C.A.Mey. | 1 images |
| Tripidium ravennae (L.) H.Scholz | 103 images |
| Triplasis purpurea (Walter) Chapm. | 4 images |
| Tripleurospermum inodorum (L.) Sch.Bip. | 2524 images |
| Trisetum flavescens (L.) P.Beauv. | 703 images |
| Triteleia bridgesii (S.Watson) Greene | 19 images |
| Triteleia crocea (Alph.Wood) Greene | 4 images |
| Triteleia grandiflora Lindl. | 60 images |
| Triteleia hendersonii Greene | 16 images |
| Triteleia hyacinthina (Lindl.) Greene | 91 images |
| Triteleia ixioides (Dryand. ex W.T.Aiton) Greene | 69 images |
| Triticum aestivum L. | 21909 images |
| Trollius laxus Salisb. | 26 images |
| Tropaeolum majus L. | 10772 images |
| Tsuga heterophylla (Raf.) Sarg. | 1155 images |
| Tsuga mertensiana (Bong.) Carrière | 115 images |
| Turgenia latifolia (L.) Hoffm. | 146 images |
| Turritis glabra L. | 1063 images |
| Tussilago farfara L. | 12512 images |
| Typha × glauca Godr. | 62 images |
| Typha angustifolia L. | 1159 images |
| Typha domingensis Pers. | 248 images |
| Typha latifolia L. | 3832 images |
| Ulex europaeus L. | 7685 images |
| Ulmus americana L. | 4931 images |
| Ulmus pumila L. | 3658 images |
| Umbellularia californica (Hook. & Arn.) Nutt. | 312 images |
| Urochloa mutica (Forssk.) T.Q.Nguyen | 12 images |
| Urtica dioica L. | 15964 images |
| Urtica gracilis Aiton | 2 images |
| Urtica urens L. | 4469 images |
| Utricularia gibba L. | 46 images |
| Utricularia inflata Walter | 2 images |
| Utricularia intermedia Hayne | 82 images |
| Utricularia minor L. | 138 images |
| Utricularia ochroleuca R.W.Hartm. | 14 images |
| Vaccinium cespitosum Michx. | 3 images |
| Vaccinium corymbosum L. | 2791 images |
| Vaccinium deliciosum Piper | 11 images |
| Vaccinium macrocarpon Aiton | 357 images |
| Vaccinium membranaceum Douglas ex Torr. | 79 images |
| Vaccinium myrtilloides Michx. | 54 images |
| Vaccinium myrtillus L. | 6103 images |
| Vaccinium ovalifolium Sm. | 63 images |
| Vaccinium ovatum Pursh | 360 images |
| Vaccinium oxycoccos L. | 547 images |
| Vaccinium parvifolium Sm. | 266 images |
| Vaccinium scoparium Leiberg ex Coville | 26 images |
| Vaccinium uliginosum L. | 1758 images |
| Valeriana acutiloba Rydb. | 2 images |
| Valeriana californica A.Heller | 21 images |
| Valeriana carinata (Loisel.) Christenh. & Byng | 3 images |
| Valeriana ciliosa (Greene) Byng & Christenh. | 29 images |
| Valeriana congesta (Lindl.) Byng & Christenh. | 16 images |
| Valeriana dentata (L.) All. | 248 images |
| Valeriana dioica L. | 2786 images |
| Valeriana eriocarpa (Desv.) Christenh. & Byng | 238 images |
| Valeriana locusta L. | 6518 images |
| Valeriana occidentalis A.Heller | 7 images |
| Valeriana officinalis L. | 9767 images |
| Valeriana rubra L. | 22061 images |
| Valeriana sitchensis Bong. | 97 images |
| Vallisneria americana Michx. | 14 images |
| Vancouveria chrysantha Greene | 6 images |
| Vancouveria hexandra C.Morren & Decne. | 23 images |
| Vancouveria planipetala Calloni | 16 images |
| Veratrum californicum Durand | 155 images |
| Veratrum insolitum Jeps. | 8 images |
| Veratrum viride Aiton | 650 images |
| Verbascum blattaria L. | 3877 images |
| Verbascum lychnitis L. | 4285 images |
| Verbascum phlomoides L. | 3599 images |
| Verbascum pulverulentum Vill. | 6935 images |
| Verbascum thapsus L. | 17089 images |
| Verbascum virgatum Stokes | 1683 images |
| Verbena bipinnatifida Schauer | 450 images |
| Verbena bonariensis L. | 10034 images |
| Verbena bracteata Cav. ex Lag. & Rodr. | 58 images |
| Verbena brasiliensis Vell. | 963 images |
| Verbena canadensis (L.) Britton | 158 images |
| Verbena hastata L. | 1354 images |
| Verbena incompta P.W.Michael | 88 images |
| Verbena lasiostachys Link | 137 images |
| Verbena macdougalii A.Heller | 19 images |
| Verbena officinalis L. | 8479 images |
| Verbena stricta Vent. | 404 images |
| Verbesina encelioides (Cav.) Benth. & Hook.f. ex A.Gray | 595 images |
| Vernonia baldwinii Torr. | 800 images |
| Vernonia fasciculata Michx. | 157 images |
| Vernonia marginata (Torr.) Raf. | 10 images |
| Veronica anagallis-aquatica L. | 1763 images |
| Veronica arvensis L. | 3332 images |
| Veronica catenata Pennell | 122 images |
| Veronica chamaedrys L. | 19478 images |
| Veronica cusickii A.Gray | 21 images |
| Veronica filiformis Sm. | 3240 images |
| Veronica hederifolia L. | 3231 images |
| Veronica longifolia L. | 2144 images |
| Veronica missurica Raf. | 1 images |
| Veronica officinalis L. | 3942 images |
| Veronica peregrina L. | 364 images |
| Veronica persica Poir. | 14715 images |
| Veronica polita Fr. | 2554 images |
| Veronica scutellata L. | 331 images |
| Veronica serpyllifolia L. | 3899 images |
| Veronica triphyllos L. | 155 images |
| Veronica verna L. | 200 images |
| Veronica wormskjoldii Roem. & Schult. | 6 images |
| Vesper bulbosus (A.Nelson) R.L.Hartm. & G.L.Nesom | 2 images |
| Vesper purpurascens (A.Gray) R.L.Hartm. & G.L.Nesom | 16 images |
| Viburnum edule (Michx.) Raf. | 34 images |
| Viburnum ellipticum Hook. | 29 images |
| Viburnum lantana L. | 15247 images |
| Viburnum lentago L. | 343 images |
| Viburnum opulus L. | 20678 images |
| Viburnum plicatum Thunb. | 4944 images |
| Viburnum tinus L. | 23098 images |
| Viburnum trilobum Marshall | 2815 images |
| Vicia americana Muhl. ex Willd. | 103 images |
| Vicia cracca L. | 8840 images |
| Vicia hirsuta (L.) Gray | 2369 images |
| Vicia lathyroides L. | 408 images |
| Vicia ludoviciana Nutt. | 31 images |
| Vicia lutea L. | 886 images |
| Vicia nigricans Hook. & Arn. | 18 images |
| Vicia pannonica Crantz | 647 images |
| Vicia sativa L. | 14626 images |
| Vicia tetrasperma (L.) Schreb. | 733 images |
| Vicia villosa Roth | 9081 images |
| Vinca major L. | 16949 images |
| Vinca minor L. | 16257 images |
| Viola adunca Sm. | 191 images |
| Viola arvensis Murray | 5546 images |
| Viola bakeri Greene | 12 images |
| Viola beckwithii Torr. & A.Gray | 6 images |
| Viola biflora L. | 1217 images |
| Viola canadensis L. | 253 images |
| Viola cuneata S.Watson | 12 images |
| Viola douglasii Steud. | 30 images |
| Viola flettii Piper | 3 images |
| Viola glabella Nutt. | 172 images |
| Viola hallii A.Gray | 7 images |
| Viola kitaibeliana Schult. | 380 images |
| Viola labradorica Schrank | 241 images |
| Viola lanceolata L. | 58 images |
| Viola lobata Benth. | 34 images |
| Viola macloskeyi F.E.Lloyd | 10 images |
| Viola nephrophylla Greene | 5 images |
| Viola nuttallii Pursh | 36 images |
| Viola odorata L. | 15045 images |
| Viola orbiculata (A.Gray) Geyer ex B.D.Jacks. | 1 images |
| Viola palustris L. | 1149 images |
| Viola pedatifida G.Don | 19 images |
| Viola pubescens Aiton | 914 images |
| Viola purpurea Kellogg | 113 images |
| Viola renifolia A.Gray | 6 images |
| Viola riviniana Rchb. | 6494 images |
| Viola selkirkii Pursh ex Goldie | 12 images |
| Viola sempervirens Greene | 121 images |
| Viola sheltonii Torr. | 23 images |
| Viola sororia Willd. | 1830 images |
| Viola tricolor L. | 8655 images |
| Viola trinervata (Howell) Howell ex A.Gray | 1 images |
| Visnaga daucoides Gaertn. | 2387 images |
| Vitis californica Benth. | 106 images |
| Vitis riparia Michx. | 1026 images |
| Vitis vinifera L. | 17005 images |
| Whipplea modesta Torr. | 52 images |
| Wolffia columbiana H.Karst. | 1 images |
| Wolffiella gladiata (Hegelm.) Hegelm. | 1 images |
| Woodsia oregana D.C.Eaton | 14 images |
| Woodsia scopulina D.C.Eaton | 9 images |
| Woodwardia fimbriata Sm. | 207 images |
| Wyethia amplexicaulis (Nutt.) Nutt. | 1 images |
| Wyethia angustifolia Nutt. | 152 images |
| Wyethia arizonica A.Gray | 2 images |
| Wyethia helianthoides Nutt. | 11 images |
| Wyethia mollis A.Gray | 2 images |
| Wyethia sagittata (Pursh) Mabb. | 251 images |
| Xanthisma coloradoense (A.Gray) D.R.Morgan & R.L.Hartm. | 5 images |
| Xanthisma gracile (Nutt.) D.R.Morgan & R.L.Hartm. | 36 images |
| Xanthium orientale L. | 505 images |
| Xanthium spinosum L. | 1116 images |
| Xerophyllum tenax (Pursh) Nutt. | 148 images |
| Xylorhiza glabriuscula Nutt. | 6 images |
| Yabea microcarpa (Hook. & Arn.) Koso-Pol. | 6 images |
| Yermo xanthocephalus Dorn | 4 images |
| Yucca angustissima Engelm. ex Trel. | 104 images |
| Yucca baccata Torr. | 143 images |
| Yucca baileyi Wooton & Standl. | 13 images |
| Yucca glauca Nutt. | 169 images |
| Yucca harrimaniae Trel. | 31 images |
| Zannichellia palustris L. | 70 images |
| Zantedeschia aethiopica (L.) Spreng. | 7139 images |
| Zea mays L. | 24247 images |
| Zeltnera arizonica (A.Gray) G.Mans. | 1 images |
| Zeltnera exaltata (Griseb.) G.Mans. | 1 images |
| Zeltnera muehlenbergii (Griseb.) G.Mans. | 1 images |
| Zinnia grandiflora Nutt. | 40 images |
| Zizia aptera (A.Gray) Fernald | 281 images |
| Zizia aurea (L.) W.D.J.Koch | 82 images |
| Zostera marina L. | 136 images |
| Zygophyllum fabago L. | 610 images |