| African rue |
Peganum harmala |
1 |
| alpine knapweed |
Centaurea nigrescens |
2 |
| American speedwell |
Veronica americana |
1 |
| annual bursage |
Ambrosia acanthicarpa |
1 |
| annual false-brome |
Brachypodium distachyon |
2 |
| annual fleabane |
Erigeron annuus |
1 |
| annual wormwood |
Artemisia annua |
1 |
| apple mint |
Mentha suaveolens |
1 |
| Arabian schismus |
Schismus arabicus |
1 |
| arroyo willow |
Salix lasiolepis |
1 |
| Athel tamarisk |
Tamarix aphylla |
1 |
| Australian chess |
Bromus arenarius |
2 |
| Australian fingergrass |
Chloris truncata |
2 |
| barb goatgrass |
Aegilops triuncialis |
3 |
| barnyardgrass |
Echinochloa crus-galli |
3 |
| bellardia |
Bellardia trixago |
3 |
| biennial wormwood |
Artemisia biennis |
2 |
| big periwinkle |
Vinca major |
1 |
| big quakinggrass |
Briza maxima |
1 |
| black henbane |
Hyoscyamus niger |
1 |
| blue lettuce |
Lactuca tatarica var. pulchella |
1 |
| blue panicum |
Panicum antidotale |
3 |
| Brazilian peppertree |
Schinus terebinthifolius |
1 |
| brightblue speedwell |
Veronica serpyllifolia ssp. humifusa |
1 |
| bristly foxtail |
Setaria verticillata |
2 |
| bristly hawksbeard |
Crepis setosa |
2 |
| broadleaf dock |
Rumex obtusifolius |
2 |
| broadleaf filaree |
Erodium botrys |
1 |
| broadleaf glandweed |
Parentucellia latifolia |
1 |
| broadleaf plantain |
Plantago major |
1 |
| buckhorn plantain |
Plantago coronopus |
1 |
| buckhorn plantain |
Plantago lanceolata |
1 |
| buffalobur |
Solanum rostratum |
1 |
| buffelgrass |
Pennisetum ciliare |
2 |
| bulbous bluegrass |
Poa bulbosa |
1 |
| bulbous canarygrass |
Phalaris aquatica |
3 |
| bull thistle |
Cirsium vulgare |
1 |
| bur beggarticks |
Bidens tripartita |
1 |
| bur chervil |
Anthriscus caucalis |
1 |
| burning nettle |
Urtica urens |
1 |
| California blackberry |
Rubus ursinus |
1 |
| California cordgrass |
Spartina foliosa |
2 |
| California false-hellebore |
Veratrum californicum |
1 |
| Canada bluegrass |
Poa compressa |
2 |
| Canada thistle |
Cirsium arvense |
1 |
| Canary Island date palm |
Phoenix canariensis |
1 |
| canarygrass |
Phalaris canariensis |
2 |
| capeweed |
Arctotheca calendula |
1 |
| carpetgrass |
Axonopus fissifolius |
1 |
| catchweed bedstraw |
Galium aparine |
1 |
| cheatgrass |
Bromus tectorum |
3 |
| chicory |
Cichorium intybus |
3 |
| Chilean rabbitsfoot grass |
Polypogon australis |
1 |
| Chinese silvergrass |
Miscanthus sinensis |
2 |
| Chinese thorn-apple |
Datura quercifolia |
2 |
| cluster dock |
Rumex conglomeratus |
2 |
| colonial bentgrass |
Agrostis capillaris |
1 |
| common cordgrass |
Spartina anglica |
1 |
| common crupina |
Crupina vulgaris |
1 |
| common evening-primrose |
Oenothera biennis |
1 |
| common mediterraneangrass |
Schismus barbatus |
2 |
| common mullein |
Verbascum thapsus |
1 |
| common pokeweed |
Phytolacca americana |
1 |
| common purslane |
Portulaca oleracea |
1 |
| common ragweed |
Ambrosia artemisiifolia |
2 |
| common teasel |
Dipsacus fullonum |
2 |
| common velvetgrass |
Holcus lanatus |
3 |
| common yarrow |
Achillea millefolium |
1 |
| corn chamomile |
Anthemis arvensis |
1 |
| cornflower |
Centaurea cyanus |
3 |
| Coulter's horseweed |
Laennecia coulteri |
2 |
| creeping bentgrass |
Agrostis stolonifera |
2 |
| creeping buttercup |
Ranunculus repens |
1 |
| crested dogtailgrass |
Cynosurus cristatus |
1 |
| crimson fountaingrass |
Pennisetum setaceum |
1 |
| croftonweed |
Ageratina adenophora |
2 |
| crowfootgrass |
Dactyloctenium aegyptium |
1 |
| crystalline iceplant |
Mesembryanthemum crystallinum |
1 |
| cutleaf geranium |
Geranium dissectum |
1 |
| dallisgrass |
Paspalum dilatatum |
2 |
| dalmatian toadflax |
Linaria dalmatica ssp. dalmatica |
2 |
| denseflower cordgrass |
Spartina densiflora |
2 |
| desert lovegrass |
Eragrostis pectinacea var. miserrima |
3 |
| devils beggarticks |
Bidens frondosa |
1 |
| diffuse knapweed |
Centaurea diffusa |
1 |
| dotted smartweed |
Persicaria punctata |
1 |
| Douglas iris |
Iris douglasiana |
2 |
| drug fumitory |
Fumaria officinalis |
1 |
| Drummond's beeblossom |
Gaura drummondii |
4 |
| early watergrass |
Echinochloa oryzoides |
2 |
| English holly |
Ilex aquifolium |
1 |
| English ivy |
Hedera helix |
3 |
| English violet |
Viola odorata |
1 |
| European beachgrass |
Ammophila arenaria |
2 |
| fall panicum |
Panicum dichotomiflorum |
2 |
| feather fingergrass |
Chloris virgata |
2 |
| feathertop |
Pennisetum villosum |
2 |
| fennel |
Foeniculum vulgare |
1 |
| fiddleleaf dock |
Rumex pulcher |
1 |
| field bindweed |
Convolvulus arvensis |
1 |
| field brome |
Bromus arvensis |
3 |
| field sandbur |
Cenchrus spinifex |
2 |
| fireweed |
Chamerion angustifolium |
2 |
| fowl bluegrass |
Poa palustris |
1 |
| foxglove |
Digitalis purpurea |
3 |
| foxtail barley |
Hordeum jubatum |
2 |
| foxtail pricklegrass |
Crypsis alopecuroides |
1 |
| Fremont's deathcamas |
Zigadenus fremontii |
1 |
| fringed willowherb |
Epilobium ciliatum ssp. ciliatum |
3 |
| fringed willowherb |
Epilobium ciliatum ssp. watsonii |
1 |
| germander speedwell |
Veronica chamaedrys |
1 |
| giant foxtail |
Setaria faberi |
1 |
| giant ragweed |
Ambrosia trifida |
2 |
| giant reed |
Arundo donax |
3 |
| goosegrass |
Eleusine indica |
1 |
| greater ammi |
Ammi majus |
1 |
| green foxtail |
Setaria viridis |
2 |
| hairy beggarticks |
Bidens pilosa |
1 |
| hairy fleabane |
Conyza bonariensis |
3 |
| hairy purslane speedwell |
Veronica peregrina ssp. xalapensis |
3 |
| hardgrass |
Sclerochloa dura |
1 |
| hedgehog dogtailgrass |
Cynosurus echinatus |
4 |
| hedgeparsley |
Torilis arvensis |
3 |
| henbit |
Lamium amplexicaule |
1 |
| high mallow |
Malva sylvestris |
1 |
| hood canarygrass |
Phalaris paradoxa |
3 |
| Hooker's evening primrose |
Oenothera elata ssp. hookeri |
2 |
| horsenettle |
Solanum carolinense |
2 |
| horseweed |
Conyza canadensis |
2 |
| hyssop loosestrife |
Lythrum hyssopifolium |
1 |
| Indian tobacco |
Nicotiana quadrivalvis |
1 |
| Italian plumeless thistle |
Carduus pycnocephalus |
2 |
| Italian ryegrass |
Festuca perennis |
1 |
| Japanese knotweed |
Fallopia japonica |
1 |
| johnsongrass |
Sorghum halepense |
5 |
| jointed goatgrass |
Aegilops cylindrica |
4 |
| juniper mistletoe |
Phoradendron juniperinum |
1 |
| Kentucky bluegrass |
Poa pratensis |
4 |
| Kerner's dock |
Rumex kerneri |
1 |
| kikuyugrass |
Pennisetum clandestinum |
1 |
| knotgrass |
Paspalum distichum |
2 |
| knotted hedgeparsley |
Torilis nodosa |
2 |
| ladysthumb |
Persicaria maculosa |
3 |
| Lamarck's bedstraw |
Galium divaricatum |
2 |
| large crabgrass |
Digitaria sanguinalis |
2 |
| late barnyard grass |
Echinochloa oryzicola |
3 |
| Lehmann lovegrass |
Eragrostis lehmanniana |
2 |
| leporinum barley |
Hordeum murinum ssp. leporinum |
1 |
| little lovegrass |
Eragrostis minor |
2 |
| little mallow |
Malva parviflora |
1 |
| little quakinggrass |
Briza minor |
3 |
| littleseed canarygrass |
Phalaris minor |
1 |
| longroot smartweed |
Polygonum amphibium var. emersum |
1 |
| longspine sandbur |
Cenchrus longispinus |
2 |
| low amaranth |
Amaranthus deflexus |
1 |
| manyflower tobacco |
Nicotiana acuminata var. multiflora |
3 |
| marshpepper smartweed |
Polygonum hydropiper |
3 |
| meadow deathcamas |
Zigadenus venenosus var. venenosus |
1 |
| meadow foxtail |
Alopecurus pratensis |
3 |
| Mediterranean lovegrass |
Eragrostis barrelieri |
4 |
| Mediterranean sage |
Salvia aethiopis |
1 |
| medusahead |
Taeniatherum caput-medusae |
1 |
| Mexican lovegrass |
Eragrostis mexicana ssp. virescens |
2 |
| Mexican whorled milkweed |
Asclepias fascicularis |
1 |
| Moroccan toadflax |
Linaria maroccana |
3 |
| moss vervain |
Glandularia pulchella |
1 |
| moth mullein |
Verbascum blattaria |
3 |
| multiflora rose |
Rosa multiflora |
2 |
| musk thistle |
Carduus nutans |
1 |
| nimblewill |
Muhlenbergia schreberi |
3 |
| nit grass |
Gastridium phleoides |
3 |
| North African knapweed |
Centaurea diluta |
1 |
| oat |
Avena sativa |
2 |
| onionweed |
Asphodelus fistulosus |
2 |
| orangeberry nightshade |
Solanum lanceolatum |
1 |
| orchardgrass |
Dactylis glomerata |
4 |
| Pacific bentgrass |
Agrostis avenacea |
1 |
| Pacific poison-oak |
Toxicodendron diversilobum |
1 |
| Pacific rush |
Juncus effusus var. pacificus |
1 |
| pale smartweed |
Persicaria lapathifolia |
1 |
| paleseed plantain |
Plantago virginica |
2 |
| Palmer amaranth |
Amaranthus palmeri |
2 |
| panic veldtgrass |
Ehrharta erecta |
1 |
| panicle willowherb |
Epilobium brachycarpum |
3 |
| Pennsylvania blackberry |
Rubus pensilvanicus |
1 |
| Pennsylvania smartweed |
Polygonum pensylvanicum |
2 |
| pennyroyal |
Mentha pulegium |
3 |
| perennial pepperweed |
Lepidium latifolium |
1 |
| perennial ryegrass |
Lolium perenne |
2 |
| perennial veldtgrass |
Ehrharta calycina |
3 |
| Peruvian peppertree |
Schinus molle |
2 |
| pineapple-weed |
Matricaria discoidea |
1 |
| poison ryegrass |
Lolium temulentum |
2 |
| poison-hemlock |
Conium maculatum |
2 |
| poverty brome |
Bromus sterilis |
1 |
| prairie cupgrass |
Eriochloa contracta |
3 |
| punagrass |
Achnatherum brachychaetum |
1 |
| puncturevine |
Tribulus terrestris |
1 |
| purple deadnettle |
Lamium purpureum |
1 |
| purple loosestrife |
Lythrum salicaria |
3 |
| purple nutsedge |
Cyperus rotundus |
2 |
| purple pampasgrass |
Cortaderia jubata |
2 |
| purple toadflax |
Linaria purpurea |
1 |
| purplestamen mullein |
Verbascum virgatum |
3 |
| rabbitfoot polypogon |
Polypogon monspeliensis |
2 |
| rattlesnake brome |
Bromus briziformis |
2 |
| ravennagrass |
Ripidium ravennae |
4 |
| red larkspur |
Delphinium nudicaule |
1 |
| red sorrel |
Rumex acetosella |
3 |
| redflower gum |
Eucalyptus ficifolia |
1 |
| redroot pigweed |
Amaranthus retroflexus |
2 |
| redstem filaree |
Erodium cicutarium |
1 |
| reed canarygrass |
Phalaris arundinacea |
2 |
| rescuegrass |
Bromus catharticus |
3 |
| rigid ryegrass |
Lolium rigidum |
1 |
| ripgut brome |
Bromus diandrus |
1 |
| Rocky Mountain iris |
Iris missouriensis |
1 |
| rough barnyardgrass |
Echinochloa muricata |
2 |
| royal larkspur |
Delphinium variegatum ssp. variegatum |
1 |
| rush skeletonweed |
Chondrilla juncea |
3 |
| Russian knapweed |
Rhaponticum repens |
1 |
| sacred thorn-apple |
Datura wrightii |
1 |
| saltcedar |
Tamarix ramosissima |
2 |
| saltgrass |
Distichlis spicata |
4 |
| saltmeadow cordgrass |
Spartina patens |
1 |
| San Bernardino larkspur |
Delphinium parryi |
1 |
| scarlet gaura |
Gaura coccinea |
2 |
| scarlet pimpernel |
Lysimachia arvensis |
2 |
| seashore vervain |
Verbena montevidensis |
1 |
| seepwillow |
Baccharis salicifolia |
1 |
| shortfruit stork's bill |
Erodium brachycarpum |
3 |
| showy milkweed |
Asclepias speciosa |
1 |
| silverleaf nightshade |
Solanum elaeagnifolium |
1 |
| silversheath knotweed |
Polygonum argyrocoleon |
1 |
| skunkbush sumac |
Rhus trilobata |
2 |
| slender cinquefoil |
Potentilla gracilis |
1 |
| slender oat |
Avena barbata |
3 |
| slender speedwell |
Veronica filiformis |
1 |
| smilograss |
Piptatherum miliaceum |
2 |
| smooth barley |
Hordeum murinum ssp. glaucum |
1 |
| smooth bedstraw |
Galium mollugo |
1 |
| smooth brome |
Bromus inermis |
3 |
| smooth cordgrass |
Spartina alterniflora |
2 |
| smooth crabgrass |
Digitaria ischaemum |
2 |
| smooth pigweed |
Amaranthus hybridus |
2 |
| smutgrass |
Sporobolus indicus |
3 |
| soft brome |
Bromus hordeaceus |
2 |
| sorghum |
Sorghum bicolor |
2 |
| southwestern cupgrass |
Eriochloa acuminata |
3 |
| spearmint |
Mentha spicata |
1 |
| spiny amaranth |
Amaranthus spinosus |
2 |
| spiny plumeless thistle |
Carduus acanthoides |
2 |
| spotted knapweed |
Centaurea stoebe ssp. micranthos |
1 |
| spotted water hemlock |
Cicuta maculata var. angustifolia |
2 |
| spreading rush |
Juncus patens |
1 |
| squarrose knapweed |
Centaurea virgata |
2 |
| squirreltail fescue |
Vulpia bromoides |
1 |
| stinging nettle |
Urtica dioica ssp. holosericea |
1 |
| stinkgrass |
Eragrostis cilianensis |
2 |
| sulfur cinquefoil |
Potentilla recta |
1 |
| sulphur knapweed |
Centaurea sulphurea |
2 |
| swamp smartweed |
Persicaria hydropiperoides |
1 |
| sweet vernalgrass |
Anthoxanthum odoratum |
4 |
| sweetbriar rose |
Rosa eglanteria |
1 |
| Syrian beancaper |
Zygophyllum fabago |
1 |
| tall fescue |
Festuca arundinacea |
3 |
| tall fleabane |
Conyza floribunda |
2 |
| tall vervain |
Verbena bonariensis |
2 |
| tanglehead |
Heteropogon contortus |
3 |
| Tasmanian bluegum |
Eucalyptus globulus |
2 |
| three-cornered leek |
Allium triquetrum |
1 |
| toad rush |
Juncus bufonius |
1 |
| toothed dock |
Rumex dentatus |
1 |
| toothpick ammi |
Ammi visnaga |
1 |
| tree tobacco |
Nicotiana glauca |
1 |
| tree-of-heaven |
Ailanthus altissima |
2 |
| tumble pigweed |
Amaranthus albus |
1 |
| Uruguayan pampas grass |
Cortaderia selloana |
3 |
| vaseygrass |
Paspalum urvillei |
1 |
| velvetleaf |
Abutilon theophrasti |
1 |
| Venice mallow |
Hibiscus trionum |
2 |
| venus-comb |
Scandix pecten-veneris |
1 |
| vinegarweed |
Trichostema lanceolatum |
1 |
| wall bedstraw |
Galium parisiense |
2 |
| Washington fan palm |
Washingtonia robusta |
2 |
| water-bent |
Polypogon viridis |
1 |
| wavyleaf gaura |
Gaura sinuata |
3 |
| wavyleaf thistle |
Cirsium undulatum |
1 |
| weedy brome |
Bromus alopecuros |
3 |
| weeping lovegrass |
Eragrostis curvula |
3 |
| western ragweed |
Ambrosia psilostachya |
1 |
| western waterhemlock |
Cicuta douglasii |
1 |
| white bladderflower |
Araujia sericifera |
1 |
| white garlic |
Allium neapolitanum |
2 |
| white horehound |
Marrubium vulgare |
1 |
| white mulberry |
Morus alba |
1 |
| white ramping fumitory |
Fumaria capreolata |
1 |
| whitestem filaree |
Erodium moschatum |
1 |
| wild garlic |
Allium vineale |
1 |
| wild oat |
Avena fatua |
1 |
| witchgrass |
Panicum capillare |
2 |
| woolly distaff thistle |
Carthamus lanatus |
2 |
| yellow bedstraw |
Galium verum |
2 |
| yellow chamomile |
Anthemis tinctoria |
1 |
| yellow foxtail |
Setaria pumila |
2 |
| yellow glandweed |
Parentucellia viscosa |
1 |
| yellow nutsedge |
Cyperus esculentus |
2 |
| yellow toadflax |
Linaria vulgaris |
2 |
| yellow wall bedstraw |
Galium murale |
2 |
| yellowflag iris |
Iris pseudacorus |
1 |
| yellowspine thistle |
Cirsium ochrocentrum |
1 |
| zigzag larkspur |
Delphinium patens |
1 |
