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Encycloweedia: Data Sheets
Weeds Sorted by Pest Rating
| "A" – Eradication, containment, rejection, or other holding action at the state-county level. Quarantine interceptions to be rejected or treated at any point in the state. | |
| Acaena novae-zelandiae | biddy-biddy |
| Acaena pallida | pale biddy-biddy |
| Achnatherum brachychaetum | punagrass |
| Alhagi maurorum | camelthorn |
| Alternanthera philoxeroides | alligatorweed |
| Arctotheca calendula | capeweed |
| Carduus acanthoides | plumeless thistle |
| Carduus nutans | musk thistle |
| Carthamus leucocaulos | whitestem distaff thistle |
| Centaurea diffusa | diffuse knapweed |
| Centaurea iberica | Iberian starthistle |
| Centaurea maculosa | spotted knapweed |
| Centaurea squarrosa | squarrose knapweed |
| Chondrilla juncea | skeletonweed |
| Cirsium ochrocentrum | yellowspine thistle |
| Cirsium undulatum | wavyleaf thistle |
| Crupina vulgaris | bearded creeper |
| Cucumis melo var. dudaim | dudaim melon |
| Cuscuta reflexa | giant dodder |
| Euphorbia esula | leafy spurge |
| Euphorbia serrata | serrate spurge |
| Halimodendron halodendron | Russian salttree |
| Halogeton glomeratus | halogeton |
| Helianthus ciliaris | blueweed |
| Heteropogon contortus | tanglehead |
| Hydrilla verticillata | hydrilla |
| Linaria genistifolia spp. dalmatica | Dalmatian toadflax |
| Onopordum acanthium | Scotch thistle |
| Onopordum tauricum | Taurian thistle |
| Onopordum illyricum | Illyrian thistle |
| Orobanche cooperi | Cooper's broomrape |
| Orobanche ramosa | branched broomrape |
| Peganum harmala | harmel |
| Physalis longifolia | long-leaf groundcherry |
| Prosopis strombulifera | creeping mesquite |
| Salsola vermiculata | wormleaf salsola |
| Salvia virgata | southern meadow sage |
| Scolymus hispanicus | golden thistle |
| Solanum cardiophyllum | heartleaf nightshade |
| Solanum dimidiatum | Torrey's nightshade |
| Sonchus arvensis | perennial sowthistle |
| Sphaerophysa salsula | Austrian peaweed |
| Striga asiatica | witchweed |
| Tagetes minuta | wild marigold |
| Zygophyllum fabago | Syrian beancaper |
| "B" – Eradication, containment, control or other holding action at the discretion of the commissioner. | |
| Acacia paradoxa | kangaroothorn |
| Acroptilon repens | Russian knapweed |
| Aegilops cylindrica | jointed goatgrass |
| Aegilops ovata | ovate goatgrass |
| Aegilops triuncialis | barb goatgrass |
| Aeschynomene rudis | rough jointvetch |
| Allium paniculatum | panicled onion |
| Allium vineale | wild garlic |
| Ambrosia trifida | giant ragweed |
| Araujia sericifera | bladderflower |
| Cardaria chalepensis | lens-podded hoarycress |
| Cardaria draba | heart-podded hoarycress |
| Cardaria pubescens | globe-podded hoarycress |
| Carthamus baeticus | smooth distaff thistle |
| Carthamus lanatus | woolly distaff thistle |
| Centaurea calcitrapa | purple starthistle |
| Centaurea sulphurea | Sicilian thistle |
| Chorispora tenella | purple mustard |
| Cirsium arvense | Canada thistle |
| Coronopus squamatus | swinecress |
| Cucumis myriocarpus | paddy melon |
| Cynara cardunculus | artichoke thistle |
| Cyperus esculentus | yellow nutsedge |
| Cyperus rotundus | purple nutsedge |
| Elytrigia repens | quackgrass |
| Euphorbia oblongata | oblong spurge |
| Gaura coccinea | scarlet gaura |
| Gaura drummondii | Drummond’s gaura |
| Gaura sinuata | wavy-leaved gaura |
| Gypsophila paniculata | baby's breath |
| Isatis tinctoria | dyer's woad |
| Lepidium latifolium | perennial peppercress |
| Lythrum salicaria | purple loosestrife |
| Muhlenbergia schreberi | nimblewill |
| Nothoscordum inodorum | false garlic |
| Nymphaea mexicana | banana waterlily |
| Oryza rufipogon | Perennial wild red rice |
| Panicum antidotale | blue panicgrass |
| Physalis viscosa | grape groundcherry |
| Polygonum cuspidatum | Japanese knotweed |
| Polygonum polystachyum | Himalayan knotweed |
| Polygonum sachalinense | giant knotweed |
| Rorippa austriaca | Austrian field cress |
| Salvia aethiopis | Mediterranean sage |
| Senecio jacobaea | tansy ragwort |
| Senecio squalidus | Oxford ragwort |
| Setaria faberi | giant foxtail |
| Solanum carolinense | Carolina horsenettle |
| Solanum elaeagnifolium | white horsenettle |
| Solanum lanceolatum | lanceleaf nightshade |
| Solanum marginatum | white-margined nightshade |
| Symphytum asperum | rough comfrey |
| Ulex europaeus | Gorse |
| Viscum album | European mistletoe |
| "C" – State endorsed holding action and eradication only when found in a nursery; action to retard spread outside of nurseries at the discretion of the commissioner; reject only when found in a cropseed for planting or at the discretion of the commissioner. | |
| Carduus pycnocephalus | Italian thistle |
| Carduus tenuiflorus | slenderflowered thistle |
| Cenchrus echinatus | southern sandbur |
| Cenchrus incertus | coast sandbur |
| Cenchrus longispinus | mat sandbur |
| Centaurea solstitialis | yellow starthistle |
| Convolvulus arvensis | field bindweed |
| Cuscuta spp. except C. reflexa | dodder |
| Cynodon spp. and hybrids | bermudagrass |
| Cytisus scoparius | Scotch broom |
| Genista monspessulana | French broom |
| Hyoscyamus niger | black henbane |
| Hypericum perforatum | Klamathweed |
| Iris douglasiana | Douglas iris |
| Iris missouriensis | western blue flag |
| Iva axillaris | poverty weed |
| Malvella leprosa | alkali mallow |
| Pennisetum clandestinum | Kikuyugrass |
| Polygonum amphibium var. emersum | kelp |
| Salsola tragus | common Russianthistle |
| Salsola paulsenii | barbwire Russianthistle |
| Sorghum halepense | Johnsongrass |
| Taeniatherum caput-medusae | medusahead |
| Tribulus terrestris | puncturevine |
| "Q" – Temporary "A" action outside of nurseries at the state-county level pending determination of a permanent rating. Species on List 2, "Federal Noxious Weed Regulation" are given an automatic "Q" rating when evaluated in California | |
| Cabomba caroliniana | Carolina fanwort |
| Cirsium japonicum | Japanese thistle |
| Euphorbia terracina | Geraldton carnation weed |
Limnobium spongia ssp. laevigatum spongia |
S. American spongeplant N. American spongeplant |
| Limnophila indica | ambulia |
| Ononis alopecuroides | foxtail restharrow |
| Pistia stratiotes | water lettuce |
| Rorippa sylvestris | creeping yellow field cress |
| Salsola collina | spineless Russianthistle |
| Salvinia auriculata complex | salvinia |