Northwestern U.S.A. Plants of Northwestern U.S.A.Explore

• Families
• Genera
• Species 498

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Acanthospermum australe (Loefl.) Kuntze

Sheepbur

106 62 Observations

Asteraceae

Acanthospermum hispidum DC.

Bristly starbur

133 89 Observations

Asteraceae

Achillea alpina L.

Chinese yarrow

23 17 Observations

Asteraceae

Achillea millefolium L.

Least Concern

Common yarrow

26,045 21,639 Observations

Asteraceae

Achillea nobilis L.

Noble yarrow

11,632 9,656 Observations

Asteraceae

Achillea ptarmica L.

Least Concern

Sneezewort

3,888 3,015 Observations

Asteraceae

Achyrachaena mollis Schauer

Blow wives

91 88 Observations

Asteraceae

Adenocaulon bicolor Hook.

Trailplant

163 122 Observations

Asteraceae

Ageratina herbacea (A.Gray) R.M.King & H.Rob.

Fragrant snakeroot

17 17 Observations

Asteraceae

Ageratina occidentalis (Hook.) R.M.King & H.Rob.

Western eupatorium

30 30 Observations

Asteraceae

Agoseris apargioides (Less.) Greene

Seaside agoseris

49 48 Observations

Asteraceae

Agoseris aurantiaca (Hook.) Greene

Mountain agoseris

47 45 Observations

Asteraceae

Agoseris glauca (Pursh) Raf.

Prairie agoseris

36 31 Observations

Asteraceae

Agoseris grandiflora (Nutt.) Greene

Grassland agoseris

58 56 Observations

Asteraceae

Agoseris heterophylla (Nutt.) Greene

Annual agoseris

45 45 Observations

Asteraceae

Agoseris retrorsa Greene

Spearleaf agoseris

28 28 Observations

Asteraceae

Ambrosia acanthicarpa Hook.

Hooker's bur ragweed

64 57 Observations

Asteraceae

Ambrosia artemisiifolia L.

Annual ragweed

5,474 4,360 Observations

Asteraceae

Ambrosia chamissonis Greene

Silver bur ragweed

140 130 Observations

Asteraceae

Ambrosia confertiflora DC.

Bur ragweed

24 23 Observations

Asteraceae

Ambrosia psilostachya DC.

Dunbible-weed

417 301 Observations

Asteraceae

Ambrosia trifida L.

Giant Ragweed

1,122 932 Observations

Asteraceae

Anaphalis margaritacea (L.) Benth. & Hook.f.

Pearly Everlasting

1,489 1,126 Observations

Asteraceae

Anisocarpus madioides Nutt.

Tarweed

16 16 Observations

Asteraceae

Antennaria alpina (L.) Gaertn.

Alpine Pussytoes

31 26 Observations

Asteraceae

Antennaria howellii Greene

Howell's pussytoes

21 20 Observations

Asteraceae

Antennaria lanata Greene

Woolly pussytoes

10 8 Observations

Asteraceae

Antennaria marginata Greene

Whitemargin pussytoes

1 1 Observation

Asteraceae

Antennaria media Greene

Rocky Mountain pussytoes

9 4 Observations

Asteraceae

Antennaria microphylla Rydb.

Littleleaf pussytoes

6 5 Observations

Asteraceae

Antennaria monocephala DC.

Pygmy pussytoes

2 2 Observations

Asteraceae

Antennaria neglecta Greene

Field pussytoes

200 138 Observations

Asteraceae

Antennaria parvifolia Nutt.

Nuttall's pussytoes

98 74 Observations

Asteraceae

Antennaria rosea Greene

Rosy pussytoes

5 3 Observations

Asteraceae

Antennaria umbrinella Rydb.

Brown-Bract Pussytoes

2 2 Observations

Asteraceae

Anthemis arvensis L.

Field chamomile

4,289 3,222 Observations

Asteraceae

Anthemis cotula L.

Chamomile

1,719 1,358 Observations

Asteraceae

Arctium lappa L.

Great Burdock

11,109 8,923 Observations

Asteraceae

Arctium minus (Hill) Bernh.

Common burdock

12,478 9,619 Observations

Asteraceae

Arctium tomentosum Mill.

Woolly burdock

2,391 1,691 Observations

Asteraceae

Arnica angustifolia Vahl

Arctic arnica

2 1 Observation

Asteraceae

Arnica cernua Howell

Serpentine arnica

3 3 Observations

Asteraceae

Arnica chamissonis Less.

Leafy arnica

102 68 Observations

Asteraceae

Arnica cordifolia Hook.

Heartleaf arnica

225 181 Observations

Asteraceae

Arnica discoidea Benth.

Rayless arnica

2 2 Observations

Asteraceae

Arnica fulgens Pursh

Foothill arnica

7 7 Observations

Asteraceae

Arnica gracilis Rydb.

Smallhead arnica

1 1 Observation

Asteraceae

Arnica lanceolata Nutt.

Soft-leaf arnica

22 20 Observations

Asteraceae

Arnica latifolia Bong.

Arnica

36 34 Observations

Asteraceae

Arnica lonchophylla Greene

Longleaf arnica

7 2 Observations

Asteraceae

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