| African mile-a-minute |
Mikania cordata |
2 |
| alpine knapweed |
Centaurea nigrescens |
2 |
| American burnweed |
Erechtites hieraciifolius |
1 |
| annual bursage |
Ambrosia acanthicarpa |
4 |
| annual fleabane |
Erigeron annuus |
1 |
| annual marshelder |
Iva annua |
2 |
| annual ragweed |
Ambrosia artemisiifolia var. elatior |
2 |
| annual sowthistle |
Sonchus oleraceus |
7 |
| annual wormwood |
Artemisia annua |
1 |
| aster |
Aster spp. |
1 |
| Australian burnweed |
Erechtites minimus |
1 |
| Aztec marigold |
Tagetes erecta |
2 |
| bellorita |
Erigeron bellioides |
1 |
| biennial wormwood |
Artemisia biennis |
2 |
| Bigelow's sneezeweed |
Helenium bigelovii |
6 |
| billy buttons |
Pycnosorus globosus |
1 |
| bitter lettuce |
Lactuca virosa |
2 |
| black knapweed |
Centaurea nigra |
2 |
| black-eyed susan |
Rudbeckia hirta |
4 |
| blessed milkthistle |
Silybum marianum |
4 |
| blue lettuce |
Lactuca tatarica var. pulchella |
1 |
| blue mistflower |
Conoclinium coelestinum |
1 |
| bristly hawksbeard |
Crepis setosa |
2 |
| bristly oxtongue |
Helminthotheca echioides |
1 |
| British yellowhead |
Inula britannica |
9 |
| brown knapweed |
Centaurea jacea |
3 |
| bull cottonthistle |
Onopordum tauricum |
3 |
| bull thistle |
Cirsium vulgare |
15 |
| bur beggarticks |
Bidens tripartita |
4 |
| burrobush |
Ambrosia salsola |
5 |
| California cottonrose |
Logfia filaginoides |
5 |
| California mugwort |
Artemisia douglasiana |
1 |
| camphorweed |
Heterotheca subaxillaris |
1 |
| Canada goldenrod |
Solidago canadensis |
2 |
| Canada thistle |
Cirsium arvense |
16 |
| cape ivy |
Delairea odorata |
1 |
| capeweed |
Arctotheca calendula |
9 |
| cardoon |
Cynara cardunculus |
4 |
| chicory |
Cichorium intybus |
5 |
| climbing aster |
Ampelaster carolinianus |
1 |
| coat buttons |
Tridax procumbens |
2 |
| coltsfoot |
Tussilago farfara |
10 |
| common burdock |
Arctium minus |
2 |
| common cocklebur |
Xanthium strumarium |
10 |
| common crupina |
Crupina vulgaris |
2 |
| common groundsel |
Senecio vulgaris |
8 |
| common ragweed |
Ambrosia artemisiifolia |
3 |
| common salsify |
Tragopogon porrifolius |
1 |
| common sunflower |
Helianthus annuus |
9 |
| common tansy |
Tanacetum vulgare |
3 |
| common tarweed |
Centromadia pungens |
6 |
| common yarrow |
Achillea millefolium |
10 |
| compassplant |
Silphium laciniatum |
3 |
| coneflower |
Rudbeckia hirta cv. Cherokee Sunset |
1 |
| coneflower |
Rudbeckia hirta cv. Indian Summer |
1 |
| coneflowers |
Echinacea spp. |
7 |
| corn chamomile |
Anthemis arvensis |
1 |
| cornflower |
Centaurea cyanus |
3 |
| cottonbatting plant |
Pseudognaphalium stramineum |
5 |
| Coulter's horseweed |
Laennecia coulteri |
3 |
| cressleaf groundsel |
Packera glabella |
3 |
| croftonweed |
Ageratina adenophora |
3 |
| crupina |
Crupina crupinastrum |
1 |
| cup rosinweed |
Silphium perfoliatum |
6 |
| curlycup gumweed |
Grindelia squarrosa |
1 |
| cutleaf burnweed |
Erechtites glomeratus |
2 |
| cutleaf coneflower |
Rudbeckia laciniata |
3 |
| dahlia |
Dahlia spp. |
2 |
| dandelion |
Taraxacum officinale |
12 |
| dense blazing star |
Liatris spicata |
1 |
| desertbroom |
Baccharis sarothroides |
4 |
| devils beggarticks |
Bidens frondosa |
4 |
| diffuse knapweed |
Centaurea diffusa |
2 |
| false chamomile |
Tripleurospermum perforatum |
2 |
| feverfew |
Tanacetum parthenium |
6 |
| Fitch's tarweed |
Hemizonia fitchii |
1 |
| Georgia aster |
Symphyotrichum georgianum |
2 |
| giant ragweed |
Ambrosia trifida |
2 |
| globethistle |
Echinops spp. |
3 |
| golden everlasting |
Xerochrysum bracteatum |
4 |
| golden tickseed |
Coreopsis tinctoria var. tinctoria |
1 |
| goldenrod |
Solidago spp. (hybrid) |
1 |
| Great Valley gumweed |
Grindelia camporum var. camporum |
1 |
| hairy beggarticks |
Bidens pilosa |
1 |
| hairy cat's ear |
Hypochaeris radicata |
7 |
| hairy fleabane |
Conyza bonariensis |
7 |
| hairy galinsoga |
Galinsoga ciliata |
3 |
| hairy galinsoga |
Galinsoga quadriradiata |
2 |
| horse thistle |
Onopordum acaulon |
4 |
| horseweed |
Conyza canadensis |
15 |
| Illyrian cottonthistle |
Onopordum illyricum |
3 |
| Italian plumeless thistle |
Carduus pycnocephalus |
2 |
| Japanese thistle |
Cirsium japonicum |
1 |
| Jersey cudweed |
Pseudognaphalium luteoalbum |
5 |
| Jerusalem artichoke |
Helianthus tuberosus |
5 |
| Kellogg's tarweed |
Deinandra kelloggii |
5 |
| Kern tarweed |
Deinandra pallida |
6 |
| ladies' tobacco |
Pseudognaphalium californicum |
5 |
| Louisiana wormwood |
Artemisia ludoviciana |
2 |
| Madagascar ragwort |
Senecio madagascariensis |
5 |
| Malta starthistle |
Centaurea melitensis |
5 |
| mile-a-minute |
Mikania micrantha |
2 |
| Mohr's Barbara's buttons |
Marshallia mohrii |
3 |
| mugwort |
Artemisia vulgaris |
2 |
| musk thistle |
Carduus nutans |
11 |
| narrowleaf cottonrose |
Logfia gallica |
6 |
| New England aster |
Symphyotrichum novae-angliae |
1 |
| New York ironweed |
Vernonia noveboracensis |
1 |
| North African knapweed |
Centaurea diluta |
1 |
| orange hawkweed |
Hieracium aurantiacum |
1 |
| oxeye daisy |
Leucanthemum vulgare |
2 |
| peregrine thistle |
Cirsium cymosum |
1 |
| perennial cornflower |
Centaurea montana |
1 |
| perennial sowthistle |
Sonchus arvensis |
6 |
| pineapple-weed |
Matricaria discoidea |
9 |
| plantainleaf pussytoes |
Antennaria plantaginifolia |
2 |
| poverty sumpweed |
Iva axillaris |
6 |
| prairie rosinweed |
Silphium terebinthinaceum |
2 |
| prickly lettuce |
Lactuca serriola |
10 |
| purple coneflower |
Echinacea purpurea |
1 |
| purple cudweed |
Gamochaeta purpurea |
7 |
| purple starthistle |
Centaurea calcitrapa |
4 |
| rabbittobacco |
Pseudognaphalium obtusifolium ssp. obtusifolium |
3 |
| rayless sunflower |
Helianthus radula |
1 |
| redpurple ragwort |
Senecio elegans |
1 |
| rosering gaillardia |
Gaillardia pulchella |
1 |
| rosilla |
Helenium puberulum |
5 |
| rush skeletonweed |
Chondrilla juncea |
7 |
| Russian knapweed |
Rhaponticum repens |
1 |
| safflower |
Carthamus tinctorius |
1 |
| saltmarsh baccharis |
Baccharis douglasii |
5 |
| satiny wormwood |
Artemisia schmidtiana |
1 |
| scaly blazing star |
Liatris squarrosa |
1 |
| Scotch thistle |
Onopordum acanthium |
14 |
| seepwillow |
Baccharis salicifolia |
7 |
| slender aster |
Symphyotrichum divaricatum |
5 |
| slenderflower thistle |
Carduus tenuiflorus |
2 |
| smallflower galinsoga |
Galinsoga parviflora |
1 |
| smooth cat's ear |
Hypochaeris glabra |
7 |
| sneezewort yarrow |
Achillea ptarmica |
1 |
| snowy thistle |
Cirsium occidentale var. candidissimum |
1 |
| South African ragwort |
Senecio inaequidens |
5 |
| spiny cocklebur |
Xanthium spinosum |
5 |
| spiny plumeless thistle |
Carduus acanthoides |
4 |
| spiny sowthistle |
Sonchus asper |
10 |
| spotted knapweed |
Centaurea stoebe |
3 |
| spotted knapweed |
Centaurea stoebe ssp. micranthos |
17 |
| squarrose knapweed |
Centaurea virgata |
2 |
| stinking chamomile |
Anthemis cotula |
6 |
| strawflower |
Helichrysum petiolare |
1 |
| sulphur knapweed |
Centaurea sulphurea |
2 |
| sunflower |
Helianthus spp. |
1 |
| tall fleabane |
Conyza floribunda |
6 |
| tall ironweed |
Vernonia gigantea |
5 |
| tall lettuce |
Lactuca canadensis |
1 |
| tansy ragwort |
Senecio jacobaea |
7 |
| tarragon |
Artemisia dracunculus |
2 |
| telegraphplant |
Heterotheca grandiflora |
3 |
| thistle |
Cirsium spp. |
3 |
| thistle |
Sphaeranthus indicus |
6 |
| two-color rabbit-tobacco |
Pseudognaphalium biolettii |
5 |
| twoflower dwarfdandelion |
Krigia biflora |
2 |
| upright prairie coneflower |
Ratibida columnifera |
2 |
| virgate tarweed |
Holocarpha virgata |
2 |
| wavyleaf purple coneflower |
Echinacea simulata |
4 |
| wavyleaf thistle |
Cirsium undulatum |
1 |
| western marsh cudweed |
Gnaphalium palustre |
6 |
| western ragweed |
Ambrosia psilostachya |
5 |
| western salsify |
Tragopogon dubius |
5 |
| whiteplume wirelettuce |
Stephanomeria exigua ssp. coronaria |
3 |
| wholeleaf rosinweed |
Silphium integrifolium |
2 |
| whorled coreopsis |
Coreopsis verticillata |
1 |
| wild chamomile |
Matricaria recutita |
4 |
| wild marigold |
Tagetes minuta |
5 |
| wild safflower |
Carthamus oxyacanthus |
2 |
| willowleaf lettuce |
Lactuca saligna |
3 |
| woodland groundsel |
Senecio sylvaticus |
1 |
| woolly distaff thistle |
Carthamus lanatus |
2 |
| yellow chamomile |
Anthemis tinctoria |
1 |
| yellow starthistle |
Centaurea solstitialis |
4 |
| yellowspine thistle |
Cirsium ochrocentrum |
1 |
