| 'ena'ena |
Pseudognaphalium sandwicensium |
3 |
| 'ena'ena |
Pseudognaphalium sandwicensium var. molokaiense |
7 |
| absinth wormwood |
Artemisia absinthium |
17 |
| African mile-a-minute |
Mikania cordata |
5 |
| alkalai marsh aster |
Almutaster pauciflorus |
4 |
| alpine knapweed |
Centaurea nigrescens |
5 |
| alpine leafybract aster |
Symphyotrichum foliaceum var. apricum |
1 |
| alpine leafybract aster |
Symphyotrichum foliaceum var. foliaceum |
23 |
| alpine sagebrush |
Artemisia scopulorum |
15 |
| American burnweed |
Erechtites hieraciifolius |
7 |
| American everlasting |
Gamochaeta americana |
1 |
| American star-thistle |
Centaurea americana |
7 |
| American trailplant |
Adenocaulon bicolor |
3 |
| anisescented goldenrod |
Solidago odora |
2 |
| annual bursage |
Ambrosia acanthicarpa |
7 |
| annual fleabane |
Erigeron annuus |
4 |
| annual marshelder |
Iva annua |
5 |
| annual ragweed |
Ambrosia artemisiifolia var. elatior |
3 |
| annual sowthistle |
Sonchus oleraceus |
51 |
| annual wormwood |
Artemisia annua |
2 |
| arctic alpine fleabane |
Erigeron humilis |
1 |
| arctic daisy |
Dendranthema spp. |
1 |
| arctic sweet coltsfoot |
Petasites frigidus |
1 |
| Arizona mule-ears |
Wyethia arizonica |
3 |
| Arizona thistle |
Cirsium arizonicum |
3 |
| arrowleaf balsamroot |
Balsamorhiza sagittata |
27 |
| arrowleaf ragwort |
Senecio triangularis |
6 |
| artichoke |
Cynara scolymus |
47 |
| Asiatic hawksbeard |
Youngia japonica |
6 |
| aster |
Aster spp. |
8 |
| Aster |
|
4 |
| aster |
Symphyotrichum spp. |
11 |
| Australian burnweed |
Erechtites minimus |
3 |
| Aztec marigold |
Tagetes erecta |
2 |
| baccharis |
Baccharis spp. |
1 |
| bahia |
Bahia spp. |
2 |
| balsam groundsel |
Packera paupercula |
4 |
| barrens silky aster |
Symphyotrichum pratense |
9 |
| bashful ragwort |
Senecio pudicus |
8 |
| Bay Biscayne creeping-oxeye |
Sphagneticola trilobata |
10 |
| bearded beggarticks |
Bidens aristosa |
2 |
| beautiful fleabane |
Erigeron formosissimus |
17 |
| bellorita |
Erigeron bellioides |
1 |
| biennial wormwood |
Artemisia biennis |
4 |
| big sagebrush |
Artemisia tridentata |
19 |
| Bigelow's sneezeweed |
Helenium bigelovii |
6 |
| Bigelow's tansyaster |
Machaeranthera bigelovii var. bigelovii |
2 |
| billy buttons |
Pycnosorus globosus |
3 |
| bitter lettuce |
Lactuca virosa |
6 |
| bitter sneezeweed |
Helenium amarum |
10 |
| black knapweed |
Centaurea nigra |
8 |
| black-eyed susan |
Rudbeckia hirta |
47 |
| blackhead fleabane |
Erigeron melanocephalus |
16 |
| blanket-flower |
Gaillardia x grandiflora |
4 |
| blanketflower |
Gaillardia aristata |
23 |
| blanketflower |
Gaillardia spp. |
6 |
| blazing star |
Liatris spp. |
2 |
| blessed milkthistle |
Silybum marianum |
32 |
| blessed thistle |
Cnicus benedictus |
2 |
| blow wives |
Achyrachaena mollis |
11 |
| blue and white daisybush |
Osteospermum ecklonis |
1 |
| blue lettuce |
Lactuca tatarica var. pulchella |
10 |
| blue mistflower |
Conoclinium coelestinum |
35 |
| bluemink |
Ageratum houstonianum |
5 |
| boneset |
Eupatorium perfoliatum |
16 |
| brassbuttons |
Cotula coronopifolia |
4 |
| bristly hawksbeard |
Crepis setosa |
3 |
| bristly oxtongue |
Helminthotheca echioides |
4 |
| bristly starbur |
Acanthospermum hispidum |
7 |
| British yellowhead |
Inula britannica |
33 |
| broadleaf arnica |
Arnica latifolia |
21 |
| broom snakeweed |
Gutierrezia sarothrae |
8 |
| broomlike ragwort |
Senecio spartioides |
2 |
| broomlike ragwort |
Senecio spartioides var. spartioides |
6 |
| brown knapweed |
Centaurea jacea |
20 |
| bull cottonthistle |
Onopordum tauricum |
20 |
| bull thistle |
Cirsium vulgare |
142 |
| bur beggarticks |
Bidens tripartita |
6 |
| burdock |
Arctium spp. |
1 |
| burmarigold |
Bidens laevis |
12 |
| burrobush |
Ambrosia salsola |
5 |
| burroweed |
Isocoma veneta |
1 |
| bushy seaside tansy |
Borrichia frutescens |
1 |
| caespitose four-nerve daisy |
Tetraneuris acaulis var. caespitosa |
2 |
| Cainville thistle |
Cirsium calcareum |
6 |
| California cottonrose |
Logfia filaginoides |
5 |
| California goldfields |
Lasthenia californica |
13 |
| California mugwort |
Artemisia douglasiana |
3 |
| camphorweed |
Heterotheca subaxillaris |
9 |
| camphorweed |
Pluchea fosbergii |
1 |
| Canada goldenrod |
Solidago canadensis |
21 |
| Canada goldenrod |
Solidago canadensis var. scabra |
1 |
| Canada thistle |
Cirsium arvense |
225 |
| Canadian horseweed |
Conyza canadensis var. canadensis |
3 |
| Canadian horseweed |
Conyza canadensis var. pusilla |
8 |
| cape ivy |
Delairea odorata |
20 |
| capeweed |
Arctotheca calendula |
15 |
| cardoon |
Cynara cardunculus |
10 |
| Carolina elephantsfoot |
Elephantopus carolinianus |
2 |
| Carolina falsedandelion |
Pyrrhopappus carolinianus |
5 |
| cat's ear |
Hypochaeris spp. |
4 |
| Chamisso arnica |
Arnica chamissonis |
8 |
| chamomile |
Anthemis spp. |
2 |
| chicory |
Cichorium intybus |
63 |
| China aster |
Callistephus chinensis Matsumoto series |
3 |
| chrysanthemum |
Chrysanthemum spp. |
10 |
| chrysogonum |
Chrysogonum spp. |
1 |
| clasping coneflower |
Dracopis amplexicaulis |
2 |
| climbing aster |
Ampelaster carolinianus |
34 |
| climbing hempweed |
Mikania scandens |
44 |
| clusterflower |
Flaveria trinervia |
3 |
| coastal nehe |
Lipochaeta lavarum |
9 |
| coastal plain chaffhead |
Carphephorus corymbosus |
3 |
| coastal plain honeycombhead |
Balduina angustifolia |
23 |
| coastal plain tickseed |
Coreopsis gladiata |
2 |
| coat buttons |
Tridax procumbens |
23 |
| cocklebur |
Xanthium spp. |
1 |
| Colorado ragwort |
Senecio soldanella |
7 |
| coltsfoot |
Tussilago farfara |
102 |
| common brighteyes |
Reichardia picroides |
6 |
| common burdock |
Arctium minus |
51 |
| common cocklebur |
Xanthium strumarium |
60 |
| common crupina |
Crupina vulgaris |
28 |
| common groundsel |
Senecio vulgaris |
32 |
| common ragweed |
Ambrosia artemisiifolia |
38 |
| common sagewort |
Artemisia campestris |
5 |
| common salsify |
Tragopogon porrifolius |
6 |
| common sneezeweed |
Helenium autumnale |
4 |
| common stickyseed |
Blennosperma nanum |
6 |
| common sunflower |
Helianthus annuus |
68 |
| common tansy |
Tanacetum vulgare |
44 |
| common tarweed |
Centromadia pungens |
6 |
| common tarweed |
Centromadia pungens ssp. pungens |
21 |
| common woolly sunflower |
Eriophyllum lanatum |
6 |
| common yarrow |
Achillea millefolium |
78 |
| common zinnia |
Zinnia violacea |
3 |
| compassplant |
Silphium laciniatum |
4 |
| coneflower |
Dracopis spp. |
1 |
| coneflower |
Rudbeckia hirta cv. Cherokee Sunset |
2 |
| coneflower |
Rudbeckia hirta cv. Indian Summer |
6 |
| coneflower |
Rudbeckia hirta cv. Irish Eyes |
2 |
| coneflowers |
Echinacea spp. |
13 |
| corn chamomile |
Anthemis arvensis |
3 |
| cornflower |
Centaurea cyanus |
41 |
| cosmos |
Cosmos spp. |
1 |
| cottonbatting plant |
Pseudognaphalium stramineum |
6 |
| cottony goldenaster |
Chrysopsis gossypina ssp. cruiseana |
10 |
| Coulter's horseweed |
Laennecia coulteri |
4 |
| creeping croftonweed |
Ageratina riparia |
6 |
| cressleaf groundsel |
Packera glabella |
7 |
| croftonweed |
Ageratina adenophora |
29 |
| crownbeard |
Verbesina encelioides |
27 |
| crupina |
Crupina crupinastrum |
3 |
| cudweed |
Gnaphalium spp. |
8 |
| cup rosinweed |
Silphium perfoliatum |
55 |
| Cupid's-shaving-brush |
Emilia fosbergii |
17 |
| cure for all |
Pluchea carolinensis |
24 |
| curlycup gumweed |
Grindelia squarrosa |
18 |
| curlycup gumweed |
Grindelia squarrosa var. serrulata |
4 |
| cutleaf burnweed |
Erechtites glomeratus |
4 |
| cutleaf coneflower |
Rudbeckia laciniata |
7 |
| cutleaf coneflower |
Rudbeckia laciniata var. ampla |
1 |
| cutleaf daisy |
Erigeron compositus |
20 |
| dahlia |
Dahlia spp. |
2 |
| daisybush |
Osteospermum spp. |
1 |
| dandelion |
Taraxacum officinale |
79 |
| dandelion |
Taraxacum spp. |
16 |
| dense blazing star |
Liatris spicata |
4 |
| dense blazing star |
Liatris spicata var. spicata |
2 |
| desert ragwort |
Senecio eremophilus |
3 |
| desertbroom |
Baccharis sarothroides |
4 |
| devils beggarticks |
Bidens frondosa |
10 |
| diffuse knapweed |
Centaurea diffusa |
48 |
| dogfennel |
Eupatorium capillifolium |
17 |
| doll's daisy |
Boltonia spp. |
1 |
| dotted gayfeather |
Liatris punctata |
2 |
| Douglas rabbitbrush |
Chrysothamnus viscidiflorus |
7 |
| Douglas' dustymaiden |
Chaenactis douglasii |
16 |
| Douglas' silverpuffs |
Microseris douglasii |
4 |
| dubautia |
Dubautia spp. |
8 |
| dune tetramolopium |
Tetramolopium rockii |
21 |
| dusty miller |
Centaurea cineraria |
1 |
| dwarf mountain ragwort |
Senecio fremontii |
6 |
| early bluetop fleabane |
Erigeron vetensis |
2 |
| early goldenrod |
Solidago juncea |
4 |
| eastern baccharis |
Baccharis halimifolia |
56 |
| eastern fournerved daisy |
Tetraneuris herbacea |
3 |
| eastern showy aster |
Eurybia conspicua |
1 |
| Eaton's fleabane |
Erigeron eatonii |
9 |
| Eaton's thistle |
Cirsium eatonii |
2 |
| eclipta |
Eclipta prostrata |
5 |
| elephantsfoot |
Elephantopus spp. |
10 |
| elephantsfoot |
Elephantopus tomentosus |
14 |
| Emory's rockdaisy |
Perityle emoryi |
9 |
| Engelmann's aster |
Eucephalus engelmannii |
8 |
| English daisy |
Bellis perennis |
5 |
| European goldenrod |
Solidago virgaurea |
2 |
| fall hawkbit |
Leontodon autumnalis |
1 |
| false chamomile |
Tripleurospermum perforatum |
29 |
| false sowthistle |
Reichardia tingitana |
1 |
| featherleaf fleabane |
Erigeron pinnatisectus |
6 |
| Fendler's groundsel |
Packera fendleri |
1 |
| Fendler's ragwort |
Senecio fendleri |
2 |
| fernleaf yarrow |
Achillea filipendulina |
13 |
| feverfew |
Tanacetum parthenium |
15 |
| fewflower blazing star |
Liatris pauciflora |
4 |
| fewleaf sunflower |
Helianthus occidentalis |
1 |
| fewleaf thistle |
Cirsium remotifolium |
3 |
| fiddleleaf hawksbeard |
Crepis runcinata |
1 |
| field marigold |
Calendula arvensis |
2 |
| field thistle |
Cirsium discolor |
8 |
| fineleaf hymenopappus |
Hymenopappus filifolius |
2 |
| Fitch's tarweed |
Hemizonia fitchii |
18 |
| fivenerve helianthella |
Helianthella quinquenervis |
7 |
| flat-top goldentop |
Euthamia graminifolia var. graminifolia |
7 |
| fleabanes |
Erigeron spp. |
7 |
| Florida wild lettuce |
Lactuca floridana |
2 |
| Fremont's goldfields |
Lasthenia fremontii |
4 |
| French marigold |
Tagetes patula |
1 |
| Georgia aster |
Symphyotrichum georgianum |
15 |
| giant ironweed |
Vernonia gigantea gigantea |
25 |
| giant ragweed |
Ambrosia trifida |
41 |
| giant sumpweed |
Cyclachaena xanthifolia |
2 |
| glandular Cape marigold |
Dimorphotheca sinuata |
2 |
| globethistle |
Echinops spp. |
3 |
| goatsbeard |
Tragopogon spp. |
16 |
| Godfrey's blazing star |
Liatris provincialis |
4 |
| golden everlasting |
Xerochrysum bracteatum |
4 |
| golden ragwort |
Packera aurea |
6 |
| golden tickseed |
Coreopsis tinctoria var. tinctoria |
1 |
| goldenrod |
Solidago spp. (hybrid) |
5 |
| goldenrod |
Solidago spp. |
36 |
| goldenweed |
Croptilon divaricatum |
4 |
| goldfields |
Lasthenia spp. |
3 |
| grassleaf Barbara's buttons |
Marshallia graminifolia var. cynanthera |
16 |
| gravelweed |
Verbesina helianthoides |
6 |
| gray goldenrod |
Solidago nemoralis |
1 |
| graygreen thistle |
Cirsium canovirens |
2 |
| graylocks four-nerve daisy |
Tetraneuris grandiflora |
14 |
| great burdock |
Arctium lappa |
7 |
| great coneflower |
Rudbeckia maxima |
20 |
| Great Valley gumweed |
Grindelia camporum |
8 |
| Great Valley gumweed |
Grindelia camporum var. camporum |
2 |
| greater tickseed |
Coreopsis major |
2 |
| green and gold |
Chrysogonum virginianum |
11 |
| green prairie coneflower |
Ratibida tagetes |
3 |
| gronovius hawkweed |
Hieracium gronovii |
2 |
| groovestem Indian plantain |
Arnoglossum plantagineum |
3 |
| guayule |
Parthenium argentatum |
2 |
| gumweed |
Grindelia spp. |
2 |
| hairy arnica |
Arnica mollis |
11 |
| hairy beggarticks |
Bidens pilosa |
10 |
| hairy cat's ear |
Hypochaeris radicata |
44 |
| hairy chaffhead |
Carphephorus paniculatus |
21 |
| hairy false goldenaster |
Heterotheca villosa |
14 |
| hairy false goldenaster |
Heterotheca villosa var. villosa |
5 |
| hairy fleabane |
Conyza bonariensis |
19 |
| hairy galinsoga |
Galinsoga ciliata |
15 |
| hairy galinsoga |
Galinsoga quadriradiata |
10 |
| hairy sunflower |
Helianthus hirsutus |
8 |
| hairy white oldfield aster |
Symphyotrichum pilosum var. pilosum |
16 |
| hairyseed bahia |
Bahia absinthifolia |
1 |
| Haleakala tetramolopium |
Tetramolopium humile ssp. haleakalae |
10 |
| Hana Forest silversword |
Argyroxiphium grayanum |
1 |
| Hawai'i silversword |
Argyroxiphium sandwicense ssp. macrocephalum |
162 |
| Hawai'i silversword |
Argyroxiphium sandwicense ssp. sandwicense |
5 |
| hawkweed oxtongue |
Picris hieracioides |
1 |
| hawkweeds |
Hieracium spp. |
31 |
| heartleaf arnica |
Arnica cordifolia |
16 |
| Heller's cudweed |
Pseudognaphalium helleri |
1 |
| hempvine |
Mikania spp. |
1 |
| hoary groundsel |
Packera werneriifolia |
2 |
| hoary Townsend daisy |
Townsendia incana |
2 |
| Holm's ragwort |
Senecio amplectens var. holmii |
5 |
| Hooker's balsamroot |
Balsamorhiza hookeri |
5 |
| horned dandelion |
Taraxacum ceratophorum |
7 |
| horse thistle |
Onopordum acaulon |
4 |
| horseweed |
Conyza canadensis |
72 |
| horseweeds |
Conyza spp. |
1 |
| iliau |
Wilkesia gymnoxiphium |
1 |
| Illyrian cottonthistle |
Onopordum illyricum |
3 |
| Indian camphorweed |
Pluchea indica |
12 |
| Indian thistle |
Cirsium edule |
3 |
| ironweed |
Vernonia spp. |
4 |
| Italian hawksbeard |
Crepis bursifolia |
2 |
| Italian plumeless thistle |
Carduus pycnocephalus |
20 |
| Jackson Hole thistle |
Cirsium subniveum |
2 |
| Japanese thistle |
Cirsium japonicum |
4 |
| Jersey cudweed |
Pseudognaphalium luteoalbum |
14 |
| Jerusalem artichoke |
Helianthus tuberosus |
36 |
| joe pye weed |
Eupatoriadelphus spp. |
15 |
| justiceweed |
Eupatorium leucolepis |
1 |
| Kalealaha beggarticks |
Bidens micrantha ssp. kalealaha |
1 |
| kau silversword |
Argyroxiphium kauense |
1 |
| Kellogg's tarweed |
Deinandra kelloggii |
6 |
| Kern tarweed |
Deinandra pallida |
6 |
| kidneyleaf rosinweed |
Silphium compositum |
10 |
| knapweeds |
Centaurea spp. |
13 |
| Kure Atoll nehe |
Lipochaeta integrifolia |
31 |
| lacy tansyaster |
Machaeranthera pinnatifida |
1 |
| ladies' tobacco |
Pseudognaphalium californicum |
5 |
| lambstongue ragwort |
Senecio integerrimus |
1 |
| lanceleaf blanketflower |
Gaillardia aestivalis |
7 |
| lanceleaf tickseed |
Coreopsis lanceolata |
21 |
| large mountain fleabane |
Erigeron coulteri |
16 |
| largeflower tickseed |
Coreopsis grandiflora |
1 |
| largeflower Townsend daisy |
Townsendia grandiflora |
2 |
| late boneset |
Eupatorium serotinum |
3 |
| late purple aster |
Symphyotrichum patens var. patens |
1 |
| Latin American fleabane |
Erigeron karvinskianus |
9 |
| lawn burweed |
Soliva sessilis |
5 |
| Le Conte's thistle |
Cirsium lecontei |
1 |
| leopard plant |
Ligularia stenocephala |
1 |
| lesser hawkbit |
Leontodon taraxacoides |
2 |
| lesser snakeroot |
Ageratina aromatica var. aromatica |
1 |
| lettuce |
Lactuca sativa |
93 |
| lettuce |
Lactuca spp. |
1 |
| limestone hawksbeard |
Crepis intermedia |
4 |
| little sagebrush |
Artemisia arbuscula |
1 |
| Louisiana wormwood |
Artemisia ludoviciana |
14 |
| Madagascar ragwort |
Senecio madagascariensis |
38 |
| Malta starthistle |
Centaurea melitensis |
15 |
| marguerite |
Argyranthemum frutescens |
1 |
| marigold |
Tagetes spp. |
6 |
| Maryland goldenaster |
Chrysopsis mariana |
4 |
| Maui beggarticks |
Bidens mauiensis |
1 |
| Maui tetramolopium |
Tetramolopium arenarium ssp. arenarium |
2 |
| Maui wormwood |
Artemisia mauiensis |
5 |
| Mauna Kea dubautia |
Dubautia arborea |
8 |
| Mauna Loa beggarticks |
Bidens menziesii |
3 |
| Mauna Loa beggarticks |
Bidens menziesii ssp. filiformis |
3 |
| Maximilian sunflower |
Helianthus maximiliani |
1 |
| meadow hawkweed |
Hieracium caespitosum |
26 |
| meadow knapweed |
Centaurea moncktonii |
15 |
| meadow salsify |
Tragopogon lamottei |
7 |
| meadow thistle |
Cirsium scariosum |
7 |
| Mexican brassbuttons |
Cotula mexicana |
1 |
| Mexican creeping zinnia |
Sanvitalia procumbens |
1 |
| Mexican flamevine |
Pseudogynoxys chenopodioides |
2 |
| michaelmas daisy |
Aster ericoides cv. Monte Casino |
3 |
| Michaux's wormwood |
Artemisia michauxiana |
6 |
| mile-a-minute |
Mikania micrantha |
10 |
| Missouri goldenrod |
Solidago missouriensis |
6 |
| Mohr's Barbara's buttons |
Marshallia mohrii |
4 |
| moist sowthistle |
Sonchus arvensis ssp. uliginosus |
1 |
| mountain big sagebrush |
Artemisia tridentata ssp. vaseyana |
5 |
| mountain dubautia |
Dubautia menziesii |
111 |
| mountain thistle |
Cirsium scopulorum |
15 |
| mouseear hawkweed |
Hieracium pilosella |
3 |
| mouseear hawkweed |
Hieracium pilosella var. niveum |
1 |
| Mt. Albert goldenrod |
Solidago simplex |
11 |
| mugwort |
Artemisia vulgaris |
26 |
| mule-ears |
Wyethia amplexicaulis |
12 |
| musk thistle |
Carduus nutans |
173 |
| narrowleaf cottonrose |
Logfia gallica |
6 |
| narrowleaf hawksbeard |
Crepis tectorum |
9 |
| nehe |
Lipochaeta spp. |
2 |
| New England aster |
Symphyotrichum novae-angliae |
6 |
| New Mexico groundsel |
Packera neomexicana var. neomexicana |
1 |
| New Mexico thistle |
Cirsium neomexicanum |
6 |
| New York ironweed |
Vernonia noveboracensis |
19 |
| Newberry's hymenopappus |
Hymenopappus newberryi |
14 |
| nodding beggarticks |
Bidens cernua |
11 |
| nodding ragwort |
Senecio bigelovii |
1 |
| nodding ragwort |
Senecio bigelovii var. bigelovii |
2 |
| North African knapweed |
Centaurea diluta |
2 |
| Nuttall's sunflower |
Helianthus nuttallii |
5 |
| Oahu wormwood |
Artemisia australis |
1 |
| oneflower helianthella |
Helianthella uniflora |
1 |
| onestem fleabane |
Erigeron simplex |
12 |
| Ontario blazing star |
Liatris cylindracea |
1 |
| orange agoseris |
Agoseris aurantiaca |
14 |
| orange coneflower |
Rudbeckia fulgida |
10 |
| orange hawkweed |
Hieracium aurantiacum |
54 |
| orange sneezeweed |
Hymenoxys hoopesii |
15 |
| Oregon fleabane |
Erigeron speciosus |
12 |
| Oregon woollyheads |
Psilocarphus oregonus |
2 |
| ovateleaf cacalia |
Arnoglossum ovatum |
1 |
| oxeye |
Heliopsis helianthoides |
9 |
| oxeye daisy |
Leucanthemum vulgare |
100 |
| Pacific aster |
Symphyotrichum chilense |
2 |
| pale agoseris |
Agoseris glauca |
23 |
| pale echinacea |
Echinacea pallida |
5 |
| paleleaf woodland sunflower |
Helianthus strumosus |
6 |
| pappose tarweed |
Centromadia parryi ssp. rudis |
3 |
| Paraguay starbur |
Acanthospermum australe |
4 |
| parasol whitetop |
Doellingeria umbellata var. umbellata |
13 |
| Parry rabbitbrush |
Ericameria parryi |
16 |
| Parry's arnica |
Arnica parryi |
10 |
| Parry's dwarf-sunflower |
Helianthella parryi |
2 |
| Parry's goldenrod |
Oreochrysum parryi |
11 |
| Parry's rabbitbrush |
Ericameria parryi var. parryi |
1 |
| Parry's Townsend daisy |
Townsendia parryi |
2 |
| pearly everlasting |
Anaphalis margaritacea |
12 |
| pearly pussytoes |
Antennaria anaphaloides |
14 |
| peregrine thistle |
Cirsium cymosum |
2 |
| perennial cornflower |
Centaurea montana |
1 |
| perennial sowthistle |
Sonchus arvensis |
69 |
| Peruvian zinnia |
Zinnia peruviana |
4 |
| pincushion |
Chaenactis spp. |
1 |
| pineapple-weed |
Matricaria discoidea |
31 |
| pineland rayless goldenrod |
Bigelowia nudata |
1 |
| pingue rubberweed |
Hymenoxys richardsonii |
12 |
| pink bogbutton |
Sclerolepis uniflora |
14 |
| pinkscale blazing star |
Liatris elegans |
1 |
| pinnate prairie coneflower |
Ratibida pinnata |
2 |
| plains blackfoot |
Melampodium leucanthum |
1 |
| plains coreopsis |
Coreopsis tinctoria |
15 |
| plantainleaf pussytoes |
Antennaria plantaginifolia |
15 |
| poor-robin fleabane |
Erigeron pulchellus |
1 |
| pot marigold |
Calendula officinalis |
4 |
| poverty sumpweed |
Iva axillaris |
13 |
| prairie rosinweed |
Silphium terebinthinaceum |
3 |
| prairie sagewort |
Artemisia frigida |
11 |
| prairie sunflower |
Helianthus petiolaris |
1 |
| prickly lettuce |
Lactuca serriola |
107 |
| purple coneflower |
Echinacea purpurea |
14 |
| purple cudweed |
Gamochaeta purpurea |
10 |
| purple elephant's-foot |
Elephantopus nudatus |
1 |
| purple starthistle |
Centaurea calcitrapa |
19 |
| pygmy goldenweed |
Tonestus pygmaeus |
9 |
| pyrethrum |
Chrysanthemum cinerariifolium |
2 |
| rabbittobacco |
Pseudognaphalium obtusifolium ssp. obtusifolium |
6 |
| ragleaf bahia |
Bahia dissecta |
9 |
| ragweed parthenium |
Parthenium hysterophorus |
5 |
| ragweed sagebrush |
Artemisia franserioides |
1 |
| ragwort |
Senecio spp. |
1 |
| rayless arnica |
Arnica x diversifolia |
1 |
| rayless sunflower |
Helianthus radula |
13 |
| red dahlia |
Dahlia coccinea |
1 |
| redpurple ragwort |
Senecio elegans |
3 |
| rice button aster |
Symphyotrichum dumosum var. dumosum |
2 |
| rockslide yellow fleabane |
Erigeron leiomerus |
11 |
| Rocky Mountain goldenrod |
Solidago multiradiata |
23 |
| Rocky Mountain groundsel |
Packera streptanthifolia |
2 |
| Rocky Mountain zinnia |
Zinnia grandiflora |
2 |
| rockyscree false goldenaster |
Heterotheca fulcrata |
1 |
| romaine lettuce |
Lactuca sativa var. longifolia |
6 |
| romerillo |
Bidens alba |
1 |
| romerillo |
Bidens alba var. radiata |
10 |
| rose rush |
Lygodesmia aphylla |
21 |
| rosering gaillardia |
Gaillardia pulchella |
18 |
| rosilla |
Helenium puberulum |
5 |
| rosy pussytoes |
Antennaria rosea |
8 |
| rough fleabane |
Erigeron strigosus |
9 |
| roundleaf thoroughwort |
Eupatorium rotundifolium |
6 |
| rubber rabbitbrush |
Ericameria nauseosa |
18 |
| rubber rabbitbrush |
Ericameria nauseosa ssp. nauseosa var. nauseosa |
4 |
| rubberweeds |
Hymenoxys spp. |
1 |
| running fleabane |
Erigeron colomexicanus |
5 |
| rush skeletonweed |
Chondrilla juncea |
32 |
| Russian knapweed |
Rhaponticum repens |
43 |
| safflower |
Carthamus tinctorius |
28 |
| sagebrush |
Artemisia spp. |
5 |
| saltmarsh baccharis |
Baccharis douglasii |
5 |
| sand dune thistle |
Cirsium pitcheri |
12 |
| sand sagebrush |
Artemisia filifolia |
5 |
| Santa Cruz tarplant |
Holocarpha macradenia |
8 |
| satiny wormwood |
Artemisia schmidtiana |
1 |
| scabland fleabane |
Erigeron bloomeri |
1 |
| scabland sagebrush |
Artemisia rigida |
2 |
| scaly blazing star |
Liatris squarrosa |
8 |
| Schweinitz's sunflower |
Helianthus schweinitzii |
2 |
| Scotch thistle |
Onopordum acanthium |
81 |
| seacoast marsh elder |
Iva imbricata |
8 |
| seepwillow |
Baccharis salicifolia |
7 |
| serrate balsamroot |
Balsamorhiza serrata |
2 |
| shaggy blazing star |
Liatris pilosa |
1 |
| shaggy fleabane |
Erigeron pumilus |
5 |
| Shasta daisy |
Leucanthemum x superbum |
2 |
| shortleaf blazing star |
Liatris tenuifolia |
6 |
| shortray fleabane |
Erigeron lonchophyllus |
10 |
| showy alpine ragwort |
Senecio amplectens var. amplectens |
2 |
| shrine jimmyweed |
Isocoma tenuisecta |
1 |
| shrubby daisybush |
Osteospermum fruticosum |
1 |
| shrubland dubautia |
Dubautia linearis |
1 |
| silk-grass |
Pityopsis graminifolia |
24 |
| skeletonleaf bursage |
Ambrosia tomentosa |
2 |
| slender aster |
Symphyotrichum divaricatum |
6 |
| slender cudweed |
Gnaphalium exilifolium |
1 |
| slender goldenrod |
Euthamia tenuifolia |
2 |
| slender hawkweed |
Hieracium gracile |
7 |
| slender woollyheads |
Psilocarphus tenellus |
1 |
| slenderflower thistle |
Carduus tenuiflorus |
5 |
| small palafox |
Palafoxia callosa |
1 |
| small wirelettuce |
Stephanomeria exigua |
6 |
| small-leaf pussytoes |
Antennaria parvifolia |
12 |
| smallflower desert-chicory |
Pyrrhopappus pauciflorus |
12 |
| smallflower galinsoga |
Galinsoga parviflora |
4 |
| smooth blue aster |
Symphyotrichum laeve var. laeve |
11 |
| smooth cat's ear |
Hypochaeris glabra |
16 |
| smooth goldfields |
Lasthenia glaberrima |
4 |
| smooth hawksbeard |
Crepis capillaris |
5 |
| smooth oxeye |
Heliopsis helianthoides var. scabra |
1 |
| smooth tidytips |
Layia chrysanthemoides |
10 |
| sneezewort yarrow |
Achillea ptarmica |
1 |
| snowy thistle |
Cirsium occidentale var. candidissimum |
2 |
| soft thistle |
Cirsium carolinianum |
4 |
| South African ragwort |
Senecio inaequidens |
5 |
| southern brassbuttons |
Cotula australis |
3 |
| southern globethistle |
Echinops ritro |
1 |
| spanishneedles |
Bidens bipinnata |
3 |
| spineless horsebrush |
Tetradymia canescens |
5 |
| spiny cocklebur |
Xanthium spinosum |
9 |
| spiny plumeless thistle |
Carduus acanthoides |
22 |
| spiny sowthistle |
Sonchus asper |
40 |
| splitleaf groundsel |
Packera dimorphophylla dimorphophylla |
1 |
| spotted joe pye weed |
Eupatoriadelphus maculatus |
5 |
| spotted joe pye weed |
Eutrochium maculatum |
1 |
| spotted knapweed |
Centaurea stoebe |
145 |
| spotted knapweed |
Centaurea stoebe ssp. micranthos |
130 |
| sprawling horseweed |
Calyptocarpus vialis |
3 |
| sprucefir fleabane |
Erigeron eximius |
10 |
| squarrose knapweed |
Centaurea virgata |
24 |
| starry rosinweed |
Silphium asteriscus |
3 |
| Steen Mountain thistle |
Cirsium peckii |
1 |
| stemless four-nerve daisy |
Tetraneuris acaulis |
1 |
| stemless thistle |
Cirsium tioganum |
22 |
| stemless Townsend daisy |
Townsendia exscapa |
1 |
| stiff greenthread |
Thelesperma filifolium |
5 |
| stiff tickseed |
Coreopsis palmata |
3 |
| stinking camphorweed |
Pluchea foetida |
9 |
| stinking chamomile |
Anthemis cotula |
22 |
| stinkweed |
Pluchea camphorata |
6 |
| stinkwort |
Dittrichia graveolens |
4 |
| Stokes' aster |
Stokesia laevis |
2 |
| strawflower |
Helichrysum petiolare |
4 |
| streamside fleabane |
Erigeron glabellus |
5 |
| subalpine fleabane |
Erigeron peregrinus |
29 |
| subalpine gumweed |
Grindelia subalpina |
2 |
| Suisun Marsh aster |
Symphyotrichum lentum |
7 |
| sulphur cosmos |
Cosmos sulphureus |
1 |
| sulphur knapweed |
Centaurea sulphurea |
3 |
| sunflower |
Helianthus annuus cultivar |
1 |
| sunflower |
Helianthus annuus cv. Teddy Bear |
1 |
| sunflower |
Helianthus spp. |
87 |
| sunflower mule-ears |
Wyethia helianthoides |
3 |
| swamp sunflower |
Helianthus angustifolius |
26 |
| sweet joepyeweed |
Eupatorium purpureum |
18 |
| sweetscented marigold |
Tagetes lucida |
1 |
| tahoka daisy |
Machaeranthera tanacetifolia |
2 |
| tall blacktip ragwort |
Senecio atratus |
2 |
| tall blazing star |
Liatris aspera |
5 |
| tall fleabane |
Conyza floribunda |
7 |
| tall fleabane |
Erigeron elatior |
9 |
| tall groundwel |
Senecio hydrophiloides |
1 |
| tall ironweed |
Vernonia angustifolia |
4 |
| tall ironweed |
Vernonia gigantea |
18 |
| tall lettuce |
Lactuca canadensis |
20 |
| tall ragwort |
Senecio serra |
7 |
| tall tickseed |
Coreopsis tripteris |
2 |
| tansy |
Tanacetum spp. |
2 |
| tansy ragwort |
Senecio jacobaea |
146 |
| tarragon |
Artemisia dracunculus |
11 |
| tasselflower brickellbush |
Brickellia grandiflora |
8 |
| telegraphplant |
Heterotheca grandiflora |
12 |
| Texas ironweed |
Vernonia texana |
10 |
| Texas skeletonplant |
Lygodesmia texana |
3 |
| Texas thistle |
Cirsium texanum |
4 |
| Texas yellowstar |
Lindheimera texana |
9 |
| thickstem aster |
Eurybia integrifolia |
2 |
| thistle |
Cirsium spp. |
27 |
| thistle |
Sphaeranthus indicus |
6 |
| threenerve fleabane |
Erigeron subtrinervis |
1 |
| threeray tarweed |
Hemizonia lobbii |
1 |
| toothed whitetop aster |
Sericocarpus asteroides |
1 |
| Tracy's thistle |
Cirsium undulatum var. tracyi |
1 |
| trailing fleabane |
Erigeron flagellaris |
4 |
| Transvaal daisy |
Gerbera spp. |
2 |
| tree marigold |
Tithonia diversifolia |
1 |
| treedaisy |
Montanoa hibiscifolia |
14 |
| tropic ageratum |
Ageratum conyzoides |
2 |
| tropical burnweed |
Erechtites valerianifolius |
1 |
| trumpetweed |
Eupatorium fistulosum |
19 |
| two-color rabbit-tobacco |
Pseudognaphalium biolettii |
5 |
| twoflower dwarfdandelion |
Krigia biflora |
4 |
| umber pussytoes |
Antennaria umbrinella |
2 |
| upright prairie coneflower |
Ratibida columnifera |
22 |
| vanillaleaf |
Carphephorus odoratissimus |
27 |
| virgate tarweed |
Holocarpha virgata |
4 |
| Waianae Range nehe |
Lipochaeta tenuifolia |
5 |
| wall lettuce |
Mycelis muralis |
87 |
| wand goldenrod |
Solidago stricta |
11 |
| wavyleaf purple coneflower |
Echinacea simulata |
5 |
| wavyleaf thistle |
Cirsium undulatum |
7 |
| West Indian beggarticks |
Bidens cynapiifolia |
1 |
| western aster |
Symphyotrichum ascendens |
29 |
| western ironweed |
Vernonia baldwinii |
1 |
| western marsh cudweed |
Gnaphalium palustre |
9 |
| western mountain aster |
Symphyotrichum spathulatum var. spathulatum |
12 |
| western ragweed |
Ambrosia psilostachya |
7 |
| western salsify |
Tragopogon dubius |
54 |
| western thistle |
Cirsium occidentale |
2 |
| white hawkweed |
Hieracium albiflorum |
5 |
| white heath aster |
Symphyotrichum ericoides var. ericoides |
19 |
| white panicle aster |
Symphyotrichum lanceolatum |
8 |
| white snakeroot |
Ageratina altissima |
16 |
| white snakeroot |
Ageratina altissima var. altissima |
14 |
| whiteflower leafcup |
Polymnia canadensis |
16 |
| whiteplume wirelettuce |
Stephanomeria exigua ssp. coronaria |
3 |
| whitestem goldenbush |
Ericameria discoidea |
11 |
| whiteweed |
Ageratum spp. |
1 |
| wholeleaf rosinweed |
Silphium integrifolium |
2 |
| whorled coreopsis |
Coreopsis verticillata |
2 |
| wild chamomile |
Matricaria recutita |
4 |
| wild marigold |
Tagetes minuta |
5 |
| wild safflower |
Carthamus oxyacanthus |
4 |
| willowleaf lettuce |
Lactuca saligna |
6 |
| woodland groundsel |
Senecio sylvaticus |
13 |
| woodland sunflower |
Helianthus divaricatus |
13 |
| woody goldenrod |
Chrysoma pauciflosculosa |
18 |
| woolly distaff thistle |
Carthamus lanatus |
4 |
| woolly mule-ears |
Wyethia mollis |
1 |
| woolly ragwort |
Packera tomentosa |
16 |
| woolly sunbonnets |
Chaptalia tomentosa |
24 |
| woollyheads |
Psilocarphus spp. |
1 |
| woollyleaf bursage |
Ambrosia grayi |
1 |
| Wooton's ragwort |
Senecio wootonii |
2 |
| wreath goldenrod |
Solidago caesia |
5 |
| Wyoming Townsend daisy |
Townsendia alpigena var. alpigena |
1 |
| yankeeweed |
Eupatorium compositifolium |
1 |
| yarrow |
Achillea aegyptiaca |
13 |
| yarrow |
Achillea spp. |
5 |
| yellow chamomile |
Anthemis tinctoria |
5 |
| yellow hawkweed |
Hieracium fendleri |
3 |
| yellow lanceleaf blanketflower |
Gaillardia aestivalis var. flavovirens |
2 |
| yellow starthistle |
Centaurea solstitialis |
141 |
| yellow thistle |
Cirsium horridulum |
19 |
| yellowspine thistle |
Cirsium ochrocentrum |
7 |
| zigzag goldenrod |
Solidago flexicaulis |
10 |
| zinnia |
Zinnia spp. |
10 |
