| Aleutian wormwood |
Artemisia aleutica |
1 |
| American burnweed |
Erechtites hieraciifolius |
1 |
| annual bursage |
Ambrosia acanthicarpa |
1 |
| annual ragweed |
Ambrosia artemisiifolia var. elatior |
1 |
| arctic alpine fleabane |
Erigeron humilis |
2 |
| arctic daisy |
Chrysanthemum arcticum |
2 |
| arctic groundsel |
Tephroseris atropurpurea |
1 |
| arctic sweet coltsfoot |
Petasites frigidus |
3 |
| arctic wormwood |
Artemisia senjavinensis |
1 |
| Bay Biscayne creeping-oxeye |
Sphagneticola trilobata |
2 |
| biennial wormwood |
Artemisia biennis |
1 |
| bitter lettuce |
Lactuca virosa |
2 |
| blanketflower |
Gaillardia aristata |
2 |
| blue lettuce |
Lactuca tatarica var. pulchella |
1 |
| blue mistflower |
Conoclinium coelestinum |
1 |
| broadleaf arnica |
Arnica latifolia |
1 |
| broom snakeweed |
Gutierrezia sarothrae |
1 |
| broomlike ragwort |
Senecio spartioides var. spartioides |
3 |
| brown knapweed |
Centaurea jacea |
1 |
| bull thistle |
Cirsium vulgare |
2 |
| burmarigold |
Bidens laevis |
2 |
| Cainville thistle |
Cirsium calcareum |
1 |
| California goldfields |
Lasthenia californica |
2 |
| California mugwort |
Artemisia douglasiana |
1 |
| Canada goldenrod |
Solidago canadensis |
1 |
| Canada thistle |
Cirsium arvense |
13 |
| Chamisso arnica |
Arnica chamissonis |
1 |
| chicory |
Cichorium intybus |
1 |
| coastal nehe |
Lipochaeta lavarum |
3 |
| coltsfoot |
Tussilago farfara |
10 |
| common burdock |
Arctium minus |
1 |
| common cocklebur |
Xanthium strumarium |
2 |
| common crupina |
Crupina vulgaris |
1 |
| common groundsel |
Senecio vulgaris |
1 |
| common ragweed |
Ambrosia artemisiifolia |
3 |
| common sunflower |
Helianthus annuus |
4 |
| common tansy |
Tanacetum vulgare |
1 |
| common tarweed |
Centromadia pungens ssp. pungens |
1 |
| common yarrow |
Achillea millefolium |
2 |
| croftonweed |
Ageratina adenophora |
1 |
| cup rosinweed |
Silphium perfoliatum |
8 |
| curlycup gumweed |
Grindelia squarrosa |
2 |
| curlycup gumweed |
Grindelia squarrosa var. serrulata |
1 |
| dandelion |
Taraxacum officinale |
1 |
| devils beggarticks |
Bidens frondosa |
1 |
| dogfennel |
Eupatorium capillifolium |
1 |
| Douglas' silverpuffs |
Microseris douglasii |
1 |
| dwarf mountain ragwort |
Senecio fremontii |
1 |
| eclipta |
Eclipta prostrata |
1 |
| feverfew |
Tanacetum parthenium |
1 |
| Fitch's tarweed |
Hemizonia fitchii |
5 |
| Fremont's goldfields |
Lasthenia fremontii |
1 |
| fuscate groundsel |
Tephroseris lindstroemii |
1 |
| Georgia aster |
Symphyotrichum georgianum |
2 |
| giant ragweed |
Ambrosia trifida |
4 |
| Great Valley gumweed |
Grindelia camporum |
1 |
| groundsel |
Tephroseris frigida |
1 |
| hairy cat's ear |
Hypochaeris radicata |
4 |
| hairy chaffhead |
Carphephorus paniculatus |
1 |
| hairy false goldenaster |
Heterotheca villosa |
1 |
| hawkweeds |
Hieracium spp. |
1 |
| Holm's ragwort |
Senecio amplectens var. holmii |
1 |
| horned dandelion |
Taraxacum ceratophorum |
2 |
| horseweed |
Conyza canadensis |
2 |
| Italian hawksbeard |
Crepis bursifolia |
1 |
| Italian plumeless thistle |
Carduus pycnocephalus |
2 |
| Jerusalem artichoke |
Helianthus tuberosus |
2 |
| Kalealaha beggarticks |
Bidens micrantha ssp. kalealaha |
1 |
| knapweeds |
Centaurea spp. |
1 |
| Kure Atoll nehe |
Lipochaeta integrifolia |
3 |
| lanceleaf tickseed |
Coreopsis lanceolata |
1 |
| Louisiana wormwood |
Artemisia ludoviciana |
2 |
| Madagascar ragwort |
Senecio madagascariensis |
1 |
| Malta starthistle |
Centaurea melitensis |
1 |
| Missouri goldenrod |
Solidago missouriensis |
2 |
| Mt. Albert goldenrod |
Solidago simplex |
5 |
| musk thistle |
Carduus nutans |
2 |
| narrowleaf saw-wort |
Saussurea angustifolia |
1 |
| northern dandelion |
Taraxacum phymatocarpum |
2 |
| onestem fleabane |
Erigeron simplex |
1 |
| orange hawkweed |
Hieracium aurantiacum |
1 |
| oxeye daisy |
Leucanthemum vulgare |
2 |
| Parry's goldenrod |
Oreochrysum parryi |
3 |
| pearly pussytoes |
Antennaria anaphaloides |
2 |
| perennial sowthistle |
Sonchus arvensis |
1 |
| pingue rubberweed |
Hymenoxys richardsonii |
3 |
| pink bogbutton |
Sclerolepis uniflora |
1 |
| plantainleaf pussytoes |
Antennaria plantaginifolia |
2 |
| prickly lettuce |
Lactuca serriola |
6 |
| purple starthistle |
Centaurea calcitrapa |
1 |
| pygmy goldenweed |
Tonestus pygmaeus |
1 |
| rayless sunflower |
Helianthus radula |
1 |
| Rocky Mountain goldenrod |
Solidago multiradiata |
11 |
| rush skeletonweed |
Chondrilla juncea |
1 |
| Russian knapweed |
Rhaponticum repens |
1 |
| safflower |
Carthamus tinctorius |
1 |
| scaly blazing star |
Liatris squarrosa |
1 |
| Scotch thistle |
Onopordum acanthium |
2 |
| slender hawkweed |
Hieracium gracile |
2 |
| smooth cat's ear |
Hypochaeris glabra |
1 |
| smooth hawksbeard |
Crepis capillaris |
1 |
| snowy thistle |
Cirsium occidentale var. candidissimum |
1 |
| spiny sowthistle |
Sonchus asper |
1 |
| spotted knapweed |
Centaurea stoebe |
2 |
| spotted knapweed |
Centaurea stoebe ssp. micranthos |
3 |
| stinking chamomile |
Anthemis cotula |
2 |
| Suisun Marsh aster |
Symphyotrichum lentum |
2 |
| swamp sunflower |
Helianthus angustifolius |
1 |
| tall lettuce |
Lactuca canadensis |
1 |
| tall ragwort |
Senecio serra |
1 |
| tansy ragwort |
Senecio jacobaea |
3 |
| thistle |
Cirsium spp. |
2 |
| wall lettuce |
Mycelis muralis |
3 |
| wavyleaf thistle |
Cirsium undulatum |
1 |
| woolly ragwort |
Packera tomentosa |
2 |
| woolly sunbonnets |
Chaptalia tomentosa |
1 |
| yarrow |
Achillea aegyptiaca |
1 |
| yellow starthistle |
Centaurea solstitialis |
1 |
| yellowspine thistle |
Cirsium ochrocentrum |
2 |
