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• Species 796

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Acanthospermum australe (Loefl.) Kuntze

Paraguayan starbur

91 56 Observations

Asteraceae

Acanthospermum hispidum DC.

Hispid starbur

107 74 Observations

Asteraceae

Achillea ageratum L.

Sweet-Nancy

461 318 Observations

Asteraceae

Achillea distans Waldst. & Kit. ex Willd.

Tall yarrow

2,099 1,688 Observations

Asteraceae

Achillea filipendulina Lam.

Fernleaf yarrow

5,320 4,160 Observations

Asteraceae

Achillea ligustica All.

Ligurian yarrow

345 243 Observations

Asteraceae

Achillea millefolium L.

Least Concern

Common yarrow

25,003 20,871 Observations

Asteraceae

Achillea nobilis L.

Noble yarrow

8,579 7,135 Observations

Asteraceae

Achillea ptarmica L.

Least Concern

Sneezewort

3,176 2,461 Observations

Asteraceae

Achyrachaena mollis Schauer

Blow wives

87 84 Observations

Asteraceae

Acourtia microcephala DC.

Sacapellote

35 34 Observations

Asteraceae

Adenocaulon bicolor Hook.

American trailplant

130 104 Observations

Asteraceae

Adenophyllum porophyllum (Cav.) Hemsl.

Poreleaf dogweed

14 10 Observations

Asteraceae

Ageratina altissima (L.) R.M. King & H. Rob.

White snakeroot

5 5 Observations

Asteraceae

Ageratina aromatica (L.) Spach

Lesser snakeroot

502 382 Observations

Asteraceae

Ageratina jucunda (Greene) Clewell & Wooten

Hammock snakeroot

13 11 Observations

Asteraceae

Ageratum conyzoides L.

Tropical whiteweed

550 429 Observations

Asteraceae

Ageratum houstonianum Mill.

Bluemink

3,036 2,600 Observations

Asteraceae

Agoseris apargioides (Less.) Greene

Woolly goat chicory

49 48 Observations

Asteraceae

Agoseris aurantiaca (Hook.) Greene

Orange agoseris

46 44 Observations

Asteraceae

Agoseris glauca (Pursh) Raf.

Pale agoseris

33 28 Observations

Asteraceae

Agoseris grandiflora (Nutt.) Greene

Bigflower agoseris

52 52 Observations

Asteraceae

Agoseris heterophylla (Nutt.) Greene

Annual agoseris

45 45 Observations

Asteraceae

Amberboa moschata (L.) DC.

Sweetsultan

5 3 Observations

Asteraceae

Amblyolepis setigera DC.

Huisache daisy

29 27 Observations

Asteraceae

Ambrosia acanthicarpa Hook.

Flatspine bur ragweed

62 55 Observations

Asteraceae

Ambrosia artemisiifolia L.

Annual ragweed

4,706 3,714 Observations

Asteraceae

Ambrosia bidentata Michx.

Lanceleaf ragweed

19 18 Observations

Asteraceae

Ambrosia confertiflora DC.

Weakleaf bur ragweed

19 19 Observations

Asteraceae

Ambrosia hispida Pursh

Coastal ragweed

10 7 Observations

Asteraceae

Ambrosia psilostachya DC.

Cuman ragweed

358 267 Observations

Asteraceae

Ambrosia tenuifolia Spreng.

Slimleaf bur ragweed

51 31 Observations

Asteraceae

Ambrosia trifida L.

Giant Ragweed

947 776 Observations

Asteraceae

Amphiachyris amoena (Shinners) Solbrig

Texas broomweed

4 4 Observations

Asteraceae

Amphiachyris dracunculoides (DC.) Nutt.

Prairie broomweed

92 87 Observations

Asteraceae

Anacyclus clavatus (Desf.) Pers.

Whitebuttons

2,402 1,550 Observations

Asteraceae

Anaphalis margaritacea (L.) Benth.

Western pearly everlasting

12 9 Observations

Asteraceae

Antennaria alpina (L.) Gaertn.

Alpine pussytoes

29 24 Observations

Asteraceae

Antennaria howellii Greene

Howell's pussytoes

20 19 Observations

Asteraceae

Antennaria marginata Greene

Whitemargin pussytoes

1 1 Observation

Asteraceae

Antennaria media Greene

Rocky Mountain pussytoes

5 3 Observations

Asteraceae

Antennaria microphylla Rydb.

Littleleaf pussytoes

5 4 Observations

Asteraceae

Antennaria monocephala DC.

Pygmy pussytoes

2 2 Observations

Asteraceae

Antennaria neglecta Greene

Field pussytoes

147 104 Observations

Asteraceae

Antennaria parlinii Fernald

Parlin's pussytoes

19 18 Observations

Asteraceae

Antennaria parvifolia Nutt.

Small-leaf pussytoes

86 65 Observations

Asteraceae

Antennaria pulchella Greene

Sierra pussytoes

6 6 Observations

Asteraceae

Antennaria rosea Greene

Rosy pussytoes

2 2 Observations

Asteraceae

Antennaria solitaria Rydb.

Singlehead pussytoes

6 6 Observations

Asteraceae

Antennaria umbrinella Rydb.

Umber pussytoes

1 1 Observation

Asteraceae

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