| Algerian ivy |
Hedera helix ssp. canariensis |
2 |
| alpine knapweed |
Centaurea nigrescens |
1 |
| annual bursage |
Ambrosia acanthicarpa |
3 |
| biennial wormwood |
Artemisia biennis |
1 |
| big periwinkle |
Vinca major |
2 |
| big sagebrush |
Artemisia tridentata |
3 |
| black knapweed |
Centaurea nigra |
2 |
| blessed thistle |
Cnicus benedictus |
2 |
| brassbuttons |
Cotula coronopifolia |
3 |
| Brazilian peppertree |
Schinus terebinthifolius |
1 |
| bristly hawksbeard |
Crepis setosa |
1 |
| bull thistle |
Cirsium vulgare |
3 |
| bur chervil |
Anthriscus caucalis |
3 |
| Canada thistle |
Cirsium arvense |
3 |
| Canary Island date palm |
Phoenix canariensis |
1 |
| canyon dodder |
Cuscuta ceanothi |
1 |
| capeweed |
Arctotheca calendula |
3 |
| chicory |
Cichorium intybus |
1 |
| clammy goosefoot |
Dysphania pumilio |
3 |
| common crupina |
Crupina vulgaris |
5 |
| common ragweed |
Ambrosia artemisiifolia |
2 |
| common St. Johnswort |
Hypericum perforatum |
5 |
| common teasel |
Dipsacus fullonum |
2 |
| common yarrow |
Achillea millefolium |
3 |
| coppery mesemb |
Malephora crocea |
1 |
| corn chamomile |
Anthemis arvensis |
2 |
| croftonweed |
Ageratina adenophora |
1 |
| crystalline iceplant |
Mesembryanthemum crystallinum |
2 |
| cutleaf goosefoot |
Chenopodium multifidum |
3 |
| devils beggarticks |
Bidens frondosa |
3 |
| diffuse knapweed |
Centaurea diffusa |
4 |
| English daisy |
Bellis perennis |
2 |
| English ivy |
Hedera helix |
1 |
| fennel |
Foeniculum vulgare |
3 |
| field bindweed |
Convolvulus arvensis |
3 |
| field dodder |
Cuscuta pentagona |
2 |
| field marigold |
Calendula arvensis |
2 |
| floating pennywort |
Hydrocotyle ranunculoides |
3 |
| Fuller's teasel |
Dipsacus sativus |
3 |
| giant ragweed |
Ambrosia trifida |
1 |
| glandular Cape marigold |
Dimorphotheca sinuata |
2 |
| greater ammi |
Ammi majus |
3 |
| green kyllinga |
Kyllinga brevifolia |
2 |
| hairy beggarticks |
Bidens pilosa |
4 |
| hairy brackenfern |
Pteridium aquilinum var. pubescens |
1 |
| hairy fleabane |
Conyza bonariensis |
1 |
| hedgeparsley |
Torilis arvensis |
2 |
| horseweed |
Conyza canadensis |
2 |
| hottentot fig |
Carpobrotus edulis |
3 |
| Italian hawksbeard |
Crepis bursifolia |
2 |
| Italian plumeless thistle |
Carduus pycnocephalus |
2 |
| Jerusalem-oak goosefoot |
Chenopodium botrys |
1 |
| low amaranth |
Amaranthus deflexus |
2 |
| Malta starthistle |
Centaurea melitensis |
4 |
| mat chaff-flower |
Alternanthera caracasana |
4 |
| Mexican brassbuttons |
Cotula mexicana |
1 |
| Mexican whorled milkweed |
Asclepias fascicularis |
2 |
| musk thistle |
Carduus nutans |
4 |
| musky marshpennywort |
Hydrocotyle moschata |
1 |
| narrow-leaved iceplant |
Conicosia pugioniformis |
2 |
| North African knapweed |
Centaurea diluta |
1 |
| Pacific poison-oak |
Toxicodendron diversilobum |
3 |
| Palmer amaranth |
Amaranthus palmeri |
1 |
| perennial pepperweed |
Lepidium latifolium |
5 |
| Peruvian peppertree |
Schinus molle |
1 |
| pineapple-weed |
Matricaria discoidea |
1 |
| poison-hemlock |
Conium maculatum |
3 |
| Powell amaranth |
Amaranthus powellii |
1 |
| prostrate pigweed |
Amaranthus blitoides |
3 |
| purple nutsedge |
Cyperus rotundus |
2 |
| purple starthistle |
Centaurea calcitrapa |
4 |
| Queen Anne's lace, wild carrot |
Daucus carota |
4 |
| redroot flatsedge |
Cyperus erythrorhizos |
2 |
| redroot pigweed |
Amaranthus retroflexus |
1 |
| rush skeletonweed |
Chondrilla juncea |
3 |
| Russian knapweed |
Rhaponticum repens |
4 |
| Russian-olive |
Elaeagnus angustifolia |
1 |
| Russian-thistle |
Salsola tragus |
2 |
| sea fig |
Carpobrotus chilensis |
1 |
| showy dewflower |
Drosanthemum floribundum |
2 |
| showy milkweed |
Asclepias speciosa |
2 |
| skunkbush sumac |
Rhus trilobata |
1 |
| slenderflower thistle |
Carduus tenuiflorus |
1 |
| slenderleaf iceplant |
Mesembryanthemum nodiflorum |
1 |
| smallflower umbrella sedge |
Cyperus difformis |
1 |
| smooth hawksbeard |
Crepis capillaris |
4 |
| smooth pigweed |
Amaranthus hybridus |
1 |
| southern brassbuttons |
Cotula australis |
2 |
| spiny amaranth |
Amaranthus spinosus |
1 |
| spiny plumeless thistle |
Carduus acanthoides |
1 |
| spotted knapweed |
Centaurea stoebe ssp. micranthos |
5 |
| spotted water hemlock |
Cicuta maculata var. angustifolia |
2 |
| squarrose knapweed |
Centaurea virgata |
2 |
| stinking chamomile |
Anthemis cotula |
3 |
| sulphur knapweed |
Centaurea sulphurea |
1 |
| tall flatsedge |
Cyperus eragrostis |
3 |
| toothpick ammi |
Ammi visnaga |
3 |
| tumble pigweed |
Amaranthus albus |
1 |
| venus-comb |
Scandix pecten-veneris |
2 |
| Washington fan palm |
Washingtonia robusta |
1 |
| wavyleaf thistle |
Cirsium undulatum |
2 |
| western waterhemlock |
Cicuta douglasii |
1 |
| white bladderflower |
Araujia sericifera |
3 |
| whiteedge flatsedge |
Cyperus flavicomus |
2 |
| wild celery |
Cyclospermum leptophyllum |
4 |
| wild parsnip |
Pastinaca sativa |
1 |
| woolly distaff thistle |
Carthamus lanatus |
2 |
| yellow chamomile |
Anthemis tinctoria |
2 |
| yellow nutsedge |
Cyperus esculentus |
2 |
| yellow starthistle |
Centaurea solstitialis |
3 |
| yellowspine thistle |
Cirsium ochrocentrum |
2 |
