| African mile-a-minute |
Mikania cordata |
4 |
| alpine knapweed |
Centaurea nigrescens |
1 |
| annual bursage |
Ambrosia acanthicarpa |
3 |
| annual marshelder |
Iva annua |
2 |
| annual sowthistle |
Sonchus oleraceus |
7 |
| artichoke |
Cynara scolymus |
5 |
| Aster |
|
1 |
| Australian burnweed |
Erechtites minimus |
1 |
| Aztec marigold |
Tagetes erecta |
1 |
| Bigelow's sneezeweed |
Helenium bigelovii |
5 |
| bitter lettuce |
Lactuca virosa |
1 |
| bitter sneezeweed |
Helenium amarum |
2 |
| black knapweed |
Centaurea nigra |
2 |
| black-eyed susan |
Rudbeckia hirta |
3 |
| blessed milkthistle |
Silybum marianum |
4 |
| boneset |
Eupatorium perfoliatum |
3 |
| bristly hawksbeard |
Crepis setosa |
1 |
| British yellowhead |
Inula britannica |
3 |
| broom snakeweed |
Gutierrezia sarothrae |
1 |
| brown knapweed |
Centaurea jacea |
3 |
| bull cottonthistle |
Onopordum tauricum |
5 |
| bull thistle |
Cirsium vulgare |
10 |
| Canada goldenrod |
Solidago canadensis |
3 |
| Canada goldenrod |
Solidago canadensis var. scabra |
15 |
| Canada thistle |
Cirsium arvense |
31 |
| capeweed |
Arctotheca calendula |
1 |
| cardoon |
Cynara cardunculus |
2 |
| chicory |
Cichorium intybus |
7 |
| climbing hempweed |
Mikania scandens |
2 |
| coat buttons |
Tridax procumbens |
5 |
| coltsfoot |
Tussilago farfara |
2 |
| common burdock |
Arctium minus |
8 |
| common cocklebur |
Xanthium strumarium |
17 |
| common crupina |
Crupina vulgaris |
8 |
| common groundsel |
Senecio vulgaris |
9 |
| common ragweed |
Ambrosia artemisiifolia |
11 |
| common sunflower |
Helianthus annuus |
12 |
| common tansy |
Tanacetum vulgare |
1 |
| common tarweed |
Centromadia pungens |
4 |
| common yarrow |
Achillea millefolium |
10 |
| coneflowers |
Echinacea spp. |
4 |
| cornflower |
Centaurea cyanus |
1 |
| cottonbatting plant |
Pseudognaphalium stramineum |
4 |
| Coulter's horseweed |
Laennecia coulteri |
1 |
| creeping croftonweed |
Ageratina riparia |
2 |
| cressleaf groundsel |
Packera glabella |
3 |
| croftonweed |
Ageratina adenophora |
3 |
| cutleaf coneflower |
Rudbeckia laciniata |
1 |
| dandelion |
Taraxacum officinale |
22 |
| dandelion |
Taraxacum spp. |
5 |
| devils beggarticks |
Bidens frondosa |
3 |
| diffuse knapweed |
Centaurea diffusa |
2 |
| Douglas' silverpuffs |
Microseris douglasii |
1 |
| eclipta |
Eclipta prostrata |
2 |
| false chamomile |
Tripleurospermum perforatum |
3 |
| fernleaf yarrow |
Achillea filipendulina |
1 |
| feverfew |
Tanacetum parthenium |
9 |
| Fitch's tarweed |
Hemizonia fitchii |
1 |
| giant ironweed |
Vernonia gigantea gigantea |
3 |
| giant ragweed |
Ambrosia trifida |
16 |
| giant sumpweed |
Cyclachaena xanthifolia |
1 |
| goatsbeard |
Tragopogon spp. |
2 |
| goldenrod |
Solidago spp. |
4 |
| great burdock |
Arctium lappa |
1 |
| hairy cat's ear |
Hypochaeris radicata |
11 |
| hairy fleabane |
Conyza bonariensis |
5 |
| hairy galinsoga |
Galinsoga ciliata |
2 |
| hairy galinsoga |
Galinsoga quadriradiata |
7 |
| hairy white oldfield aster |
Symphyotrichum pilosum var. pilosum |
2 |
| hawkweeds |
Hieracium spp. |
12 |
| horse thistle |
Onopordum acaulon |
2 |
| horseweed |
Conyza canadensis |
16 |
| Illyrian cottonthistle |
Onopordum illyricum |
2 |
| Japanese thistle |
Cirsium japonicum |
2 |
| Jersey cudweed |
Pseudognaphalium luteoalbum |
5 |
| Jerusalem artichoke |
Helianthus tuberosus |
7 |
| Kellogg's tarweed |
Deinandra kelloggii |
4 |
| Kern tarweed |
Deinandra pallida |
4 |
| knapweeds |
Centaurea spp. |
2 |
| ladies' tobacco |
Pseudognaphalium californicum |
3 |
| lawn burweed |
Soliva sessilis |
1 |
| lettuce |
Lactuca sativa |
1 |
| Madagascar ragwort |
Senecio madagascariensis |
1 |
| Malta starthistle |
Centaurea melitensis |
5 |
| meadow hawkweed |
Hieracium caespitosum |
2 |
| Mexican brassbuttons |
Cotula mexicana |
1 |
| mugwort |
Artemisia vulgaris |
6 |
| musk thistle |
Carduus nutans |
5 |
| narrowleaf cottonrose |
Logfia gallica |
5 |
| narrowleaf goldenrod |
Euthamia graminifolia |
1 |
| New Mexico thistle |
Cirsium neomexicanum |
1 |
| nodding beggarticks |
Bidens cernua |
10 |
| orange hawkweed |
Hieracium aurantiacum |
6 |
| oxeye daisy |
Leucanthemum vulgare |
7 |
| perennial sowthistle |
Sonchus arvensis |
17 |
| pineapple-weed |
Matricaria discoidea |
7 |
| pot marigold |
Calendula officinalis |
2 |
| poverty sumpweed |
Iva axillaris |
5 |
| prickly lettuce |
Lactuca serriola |
15 |
| purple cudweed |
Gamochaeta purpurea |
5 |
| purple starthistle |
Centaurea calcitrapa |
3 |
| rabbittobacco |
Pseudognaphalium obtusifolium ssp. obtusifolium |
2 |
| redpurple ragwort |
Senecio elegans |
1 |
| rosering gaillardia |
Gaillardia pulchella |
1 |
| rosilla |
Helenium puberulum |
4 |
| rush skeletonweed |
Chondrilla juncea |
2 |
| Russian knapweed |
Rhaponticum repens |
5 |
| safflower |
Carthamus tinctorius |
4 |
| Scotch thistle |
Onopordum acanthium |
8 |
| slenderflower thistle |
Carduus tenuiflorus |
1 |
| smooth cat's ear |
Hypochaeris glabra |
7 |
| smooth hawksbeard |
Crepis capillaris |
1 |
| South African ragwort |
Senecio inaequidens |
3 |
| spiny cocklebur |
Xanthium spinosum |
4 |
| spiny plumeless thistle |
Carduus acanthoides |
3 |
| spiny sowthistle |
Sonchus asper |
11 |
| spotted joe pye weed |
Eupatoriadelphus maculatus |
1 |
| spotted knapweed |
Centaurea stoebe |
1 |
| spotted knapweed |
Centaurea stoebe ssp. micranthos |
12 |
| stinking chamomile |
Anthemis cotula |
4 |
| stinkwort |
Dittrichia graveolens |
1 |
| sulphur knapweed |
Centaurea sulphurea |
1 |
| sunflower |
Helianthus spp. |
1 |
| tall fleabane |
Conyza floribunda |
4 |
| tall ironweed |
Vernonia gigantea |
3 |
| tall lettuce |
Lactuca canadensis |
6 |
| telegraphplant |
Heterotheca grandiflora |
1 |
| thistle |
Cirsium spp. |
1 |
| threeray tarweed |
Hemizonia lobbii |
1 |
| trumpetweed |
Eupatorium fistulosum |
13 |
| two-color rabbit-tobacco |
Pseudognaphalium biolettii |
3 |
| wavyleaf thistle |
Cirsium undulatum |
1 |
| western marsh cudweed |
Gnaphalium palustre |
3 |
| western ragweed |
Ambrosia psilostachya |
5 |
| western salsify |
Tragopogon dubius |
7 |
| white heath aster |
Symphyotrichum ericoides var. ericoides |
4 |
| white snakeroot |
Ageratina altissima var. altissima |
10 |
| wild chamomile |
Matricaria recutita |
4 |
| wild marigold |
Tagetes minuta |
4 |
| wild safflower |
Carthamus oxyacanthus |
4 |
| willowleaf lettuce |
Lactuca saligna |
1 |
| yellow starthistle |
Centaurea solstitialis |
8 |
| yellowspine thistle |
Cirsium ochrocentrum |
1 |
| zigzag goldenrod |
Solidago flexicaulis |
10 |
