Scientific Namesort icon Common Name Type Subtype Extent Risk of Introduction First Source
Prosopis velutina mesquite plant woody limited n/a (already in CA) USDA Plant/Pest
Prunus cerasifera cherry plum plant woody widespread n/a (already in CA) Cal-IPC list
Pueraria montana var. lobata kudzu plant herbaceous not present moderate OR Weed List
Pyracantha angustifolia pyracantha plant woody limited n/a (already in CA) Cal-IPC list
Pyracantha coccinea pyracantha plant woody limited n/a (already in CA) Cal-IPC list
Pyracantha crenulata pyracantha plant woody limited n/a (already in CA) Cal-IPC list
Ranunculus acris tall buttercup plant herbaceous limited n/a (already in CA) MT Weed List
Ranunculus repens creeping buttercup plant herbaceous widespread n/a (already in CA) Cal-IPC list
Raphanus raphanistrum wild radish plant herbaceous widespread n/a (already in CA) Weeds of CA
Raphanus sativus radish plant herbaceous widespread n/a (already in CA) Cal-IPC list
Retama monosperma bridal broom plant woody limited n/a (already in CA) CDFA
Ricinus communis castorbean plant herbaceous widespread n/a (already in CA) Cal-IPC list
Robinia pseudoacacia black locust plant woody limited n/a (already in CA) Cal-IPC list
Rorippa austriaca Austrian field cress plant herbaceous limited n/a (already in CA) CDFA
Rorippa sylvestris creeping yellow field cress plant herbaceous limited n/a (already in CA) CDFA
Rottboellia cochinchinensis itchgrass plant grass not present moderate USDA Plant/Pest
Rubus armeniacus Himalaya blackberry plant woody widespread n/a (already in CA) CDFA
Rubus moluccanus wild raspberry plant woody not present low USDA Plant/Pest
Rumex acetosella red sorrel plant herbaceous widespread n/a (already in CA) Cal-IPC list
Rumex crispus curly dock plant herbaceous widespread n/a (already in CA) Cal-IPC list
Saccharum ravennae ravennagrass plant grass limited n/a (already in CA) Cal-IPC list
Saccharum spontaneum wild sugarcane plant grass not present low USDA Plant/Pest
Sagittaria graminea grass-leaved arrowhead plant herbaceous not present high WA Weed List
Sagittaria sagittifolia arrowhead plant herbaceous not present low USDA Plant/Pest
Salsola collina spineless Russian thistle plant herbaceous not present high CDFA
Salsola paulsenii barbwire Russian-thistle plant herbaceous widespread n/a (already in CA) CDFA
Salsola soda oppositeleaf Russian thistle plant herbaceous limited n/a (already in CA) Cal-IPC list
Salsola tragus Russian-thistle plant herbaceous widespread n/a (already in CA) CDFA
Salsola vermiculata wormleaf salsola plant herbaceous not present low CDFA
Salvia aethiopis Mediterranean sage plant herbaceous limited n/a (already in CA) CDFA
Salvia pratensis meadow clary plant herbaceous not present moderate WA Weed List
Salvia sclarea clary sage plant herbaceous not present moderate WA Weed List
Salvia virgata southern meadow sage plant herbaceous not present moderate CDFA
Salvinia auriculata giant salvinia plant herbaceous not present low USDA Plant/Pest
Salvinia biloba giant salvinia plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Salvinia herzogii giant salvinia plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Salvinia molesta giant salvinia plant herbaceous limited n/a (already in CA) Cal-IPC list
Sapium sebiferum Chinese tallowtree plant woody limited n/a (already in CA) Cal-IPC list
Saponaria officinalis bouncingbet plant herbaceous limited n/a (already in CA) Cal-IPC list
Sargassum horneri Asian seaweed plant algae limited moderate Hoffman NOAA
Sargassum muticum Sargassum muticum plant algae limited low Hoffman NOAA
Schinus molle Peruvian peppertree plant woody limited n/a (already in CA) Cal-IPC list
Schinus terebinthifolius Brazilian peppertree plant woody limited n/a (already in CA) Cal-IPC list
Schismus arabicus mediterraneangrass plant grass widespread n/a (already in CA) Cal-IPC list
Schismus barbatus mediterraneangrass plant grass widespread n/a (already in CA) Cal-IPC list
Scolymus hispanicus golden thistle plant herbaceous limited n/a (already in CA) CDFA
Secale cereale cereal rye plant grass widespread n/a (already in CA) WA Weed List
Senecio inaequidens South African ragwort plant woody not present low USDA Plant/Pest
Senecio jacobaea tansy ragwort plant herbaceous limited n/a (already in CA) CDFA
Senecio linearifolius narrowleaf ragwort plant herbaceous not present low CDFA
Senecio madagascariensis Madagascar ragwort plant herbaceous not present moderate USDA Plant/Pest
Senecio squalidus Oxford ragwort plant herbaceous not present low CDFA
Senecio vulgaris old-man-in-the-spring plant herbaceous widespread n/a (already in CA) Weeds of CA
Senna obtusifolia sicklepod plant herbaceous limited n/a (already in CA) CDFA
Sesbania punicea red sesbania plant woody limited n/a (already in CA) Cal-IPC list
Setaria faberi giant foxtail plant grass widespread n/a (already in CA) CDFA
Setaria pumila yellow foxtail plant grass widespread n/a (already in CA) Weeds of CA
Setaria pumila ssp. pallidefusca cattail grass plant grass not present moderate USDA Plant/Pest
Setaria viridis green bristlegrass plant grass widespread n/a (already in CA) Weeds of CA
Silene latifolia ssp. alba bladder campion plant herbaceous limited n/a (already in CA) WA Weed List
Silybum marianum blessed milkthistle plant herbaceous widespread n/a (already in CA) Cal-IPC list
Sinapis arvensis wild mustard plant herbaceous widespread n/a (already in CA) Cal-IPC list
Sisymbrium irio London rocket plant herbaceous widespread n/a (already in CA) Cal-IPC list
Solanum cardiophyllum heartleaf nightshade plant herbaceous not present low CDFA
Solanum carolinense Carolina horsenettle plant herbaceous limited n/a (already in CA) CDFA
Solanum dimidiatum Torrey's nightshade plant herbaceous limited n/a (already in CA) CDFA
Solanum elaeagnifolium silverleaf nightshade plant herbaceous limited n/a (already in CA) CDFA
Solanum lanceolatum lanceleaf nightshade plant herbaceous limited n/a (already in CA) CDFA
Solanum marginatum white-margined nightshade plant woody limited n/a (already in CA) CDFA
Solanum nigrum black nightshade plant herbaceous widespread n/a (already in CA) Weeds of CA
Solanum physalifolium hoe nightshade plant herbaceous widespread n/a (already in CA) Weeds of CA
Solanum rostratum buffalobur plant herbaceous limited n/a (already in CA) ID Weed List
Solanum tampicense wetland nightshade plant woody not present low USDA Plant/Pest
Solanum torvum turkeyberry plant woody not present low USDA Plant/Pest
Solanum viarum tropical soda apple plant herbaceous not present low USDA Plant/Pest
Soliva sessilis lawnweed plant herbaceous widespread n/a (already in CA) WA Weed List
Sonchus arvensis perennial sowthistle plant herbaceous limited n/a (already in CA) CDFA
Sonchus oleraceaus common sowthistle plant herbaceous widespread n/a (already in CA) Weeds of CA
Sorghum almum Columbus grass plant grass not present moderate NV Weed List
Sorghum bicolor perennial sweet Sudan plant grass limited n/a (already in CA) NV Weed List
Sorghum halepense johnsongrass plant grass widespread n/a (already in CA) WA Weed List
Sorghum propinquum sorghum plant grass not present low NV Weed List
Sparganium erectum exotic bur reed plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Spartina alterniflora smooth cordgrass and hybrids plant grass limited n/a (already in CA) Cal-IPC list
Spartina alterniflora x foliosa hybrids smooth cordgrass and hybrids plant grass limited n/a (already in CA) Cal-IPC list
Spartina anglica common cordgrass plant grass limited n/a (already in CA) Cal-IPC list
Spartina densiflora dense-flowered cordgrass plant grass limited n/a (already in CA) Cal-IPC list
Spartina patens saltmeadow cord grass plant grass limited n/a (already in CA) Cal-IPC list
Spartium junceum Spanish broom plant woody widespread n/a (already in CA) Cal-IPC list
Spermacoce alata winged false buttonweed plant herbaceous not present low USDA Plant/Pest
Sphaerophysa salsula Austrian peaweed plant herbaceous limited n/a (already in CA) CDFA
Stellaria media common chickweed plant herbaceous widespread n/a (already in CA) Weeds of CA
Stipa capensis Mediterranean steppegrass plant grass limited n/a (already in CA) Cal-IPC list
Striga asiatica witchweed plant herbaceous not present moderate CDFA
Striga spp. witchweed plant herbaceous not present high USDA Plant/Pest
Symphytum asperum rough comfrey plant herbaceous limited n/a (already in CA) CDFA
Taeniatherum caput-medusae medusahead plant grass widespread n/a (already in CA) CDFA
Tagetes minuta wild marigold plant herbaceous not present moderate CDFA
Tamarix aphylla athel tamarisk plant woody limited n/a (already in CA) Cal-IPC list
Tamarix chinensis salt cedar plant woody limited n/a (already in CA) CO Weed List