Scientific Namesort icon Common Name Type Subtype Extent Risk of Introduction First Source
Zygophyllum fabago Syrian beancaper plant herbaceous limited n/a (already in CA) CDFA
Zostera japonica Japanese eelgrass plant herbaceous limited n/a (already in CA) CDFA
Zantedeschia aethiopica calla lily plant herbaceous limited n/a (already in CA) Cal-IPC list
Watsonia meriana bulbil watsonia plant herbaceous limited n/a (already in CA) Cal-IPC list
Washingtonia robusta Mexican fan palm plant woody limited n/a (already in CA) Cal-IPC list
Vulpia myuros rattail fescue plant grass widespread n/a (already in CA) Cal-IPC list
Viscum album European mistletoe plant herbaceous limited n/a (already in CA) CDFA
Vinca major big periwinkle plant herbaceous widespread n/a (already in CA) Cal-IPC list
Vicia villosa hairy vetch plant herbaceous widespread n/a (already in CA) Weeds of CA
Vicia sativa garden vetch plant herbaceous widespread n/a (already in CA) Weeds of CA
Verbena litoralis tall vervain plant herbaceous widespread n/a (already in CA) Cal-IPC list
Verbascum thapsus common mullein plant herbaceous widespread n/a (already in CA) Cal-IPC list
Verbascum blattaria moth mullein plant herbaceous limited n/a (already in CA) CO Weed List
Vallisneria spp. eelgrass plant herbaceous not present high CDFA
Utricularia inflata swollen bladderwort plant herbaceous not present moderate WA Weed List
Urochloa panicoides liverseed grass plant grass not present high USDA Plant/Pest
Undaria pinnatifida wakame plant algae widespread n/a (already in CA) Cal-IPC list
Ulmus pumila Siberian elm plant woody limited n/a (already in CA) Med. plants list
Ulex europaeus gorse plant woody limited n/a (already in CA) CDFA
Tussilago farfara coltsfoot plant herbaceous not present moderate OR Weed List
Tripleurospermum perforatum scentless false mayweed plant herbaceous not present low CO Weed List
Trifolium hirtum rose clover plant herbaceous widespread n/a (already in CA) Cal-IPC list
Tridax procumbens coat buttons plant herbaceous not present low USDA Plant/Pest
Tribulus terrestris puncturevine plant herbaceous widespread n/a (already in CA) CDFA
Trapa natans water-chestnut plant herbaceous not present moderate AZ Weed List
Trapa bicornis water caltrap plant herbaceous not present low WA Weed List
Torilis arvensis hedgeparsley plant herbaceous widespread n/a (already in CA) Cal-IPC list
Thymelaea passerina spurge flax plant herbaceous not present moderate WA Weed List
Tanacetum vulgare common tansy plant herbaceous limited n/a (already in CA) Cal-IPC list
Tamarix ramosissima saltcedar plant woody widespread n/a (already in CA) Cal-IPC list
Tamarix parviflora smallflower tamarisk plant woody widespread n/a (already in CA) Cal-IPC list
Tamarix chinensis salt cedar plant woody limited n/a (already in CA) CO Weed List
Tamarix aphylla athel tamarisk plant woody limited n/a (already in CA) Cal-IPC list
Tagetes minuta wild marigold plant herbaceous not present moderate CDFA
Taeniatherum caput-medusae medusahead plant grass widespread n/a (already in CA) CDFA
Symphytum asperum rough comfrey plant herbaceous limited n/a (already in CA) CDFA
Striga spp. witchweed plant herbaceous not present high USDA Plant/Pest
Striga asiatica witchweed plant herbaceous not present moderate CDFA
Stipa capensis Mediterranean steppegrass plant grass limited n/a (already in CA) Cal-IPC list
Stellaria media common chickweed plant herbaceous widespread n/a (already in CA) Weeds of CA
Sphaerophysa salsula Austrian peaweed plant herbaceous limited n/a (already in CA) CDFA
Spermacoce alata winged false buttonweed plant herbaceous not present low USDA Plant/Pest
Spartium junceum Spanish broom plant woody widespread n/a (already in CA) Cal-IPC list
Spartina patens saltmeadow cord grass 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 anglica common cordgrass 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 alterniflora smooth cordgrass and hybrids plant grass limited n/a (already in CA) Cal-IPC list
Sparganium erectum exotic bur reed plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Sorghum propinquum sorghum plant grass not present low NV Weed List
Sorghum halepense johnsongrass plant grass widespread n/a (already in CA) WA Weed List
Sorghum bicolor perennial sweet Sudan plant grass limited n/a (already in CA) NV Weed List
Sorghum almum Columbus grass plant grass not present moderate NV Weed List
Sonchus oleraceaus common sowthistle plant herbaceous widespread n/a (already in CA) Weeds of CA
Sonchus arvensis perennial sowthistle plant herbaceous limited n/a (already in CA) CDFA
Soliva sessilis lawnweed plant herbaceous widespread n/a (already in CA) WA Weed List
Solanum viarum tropical soda apple plant herbaceous not present low USDA Plant/Pest
Solanum torvum turkeyberry plant woody not present low USDA Plant/Pest
Solanum tampicense wetland nightshade plant woody not present low USDA Plant/Pest
Solanum rostratum buffalobur plant herbaceous limited n/a (already in CA) ID Weed List
Solanum physalifolium hoe nightshade plant herbaceous widespread n/a (already in CA) Weeds of CA
Solanum nigrum black nightshade plant herbaceous widespread n/a (already in CA) Weeds of CA
Solanum marginatum white-margined nightshade plant woody limited n/a (already in CA) CDFA
Solanum lanceolatum lanceleaf nightshade plant herbaceous limited n/a (already in CA) CDFA
Solanum elaeagnifolium silverleaf nightshade plant herbaceous limited n/a (already in CA) CDFA
Solanum dimidiatum Torrey's nightshade plant herbaceous limited n/a (already in CA) CDFA
Solanum carolinense Carolina horsenettle plant herbaceous limited n/a (already in CA) CDFA
Solanum cardiophyllum heartleaf nightshade plant herbaceous not present low CDFA
Sisymbrium irio London rocket 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
Silybum marianum blessed milkthistle plant herbaceous widespread n/a (already in CA) Cal-IPC list
Silene latifolia ssp. alba bladder campion plant herbaceous limited n/a (already in CA) WA Weed List
Setaria viridis green bristlegrass 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 pumila yellow foxtail plant grass widespread n/a (already in CA) Weeds of CA
Setaria faberi giant foxtail plant grass widespread n/a (already in CA) CDFA
Sesbania punicea red sesbania plant woody limited n/a (already in CA) Cal-IPC list
Senna obtusifolia sicklepod plant herbaceous limited n/a (already in CA) CDFA
Senecio vulgaris old-man-in-the-spring plant herbaceous widespread n/a (already in CA) Weeds of CA
Senecio squalidus Oxford ragwort plant herbaceous not present low CDFA
Senecio madagascariensis Madagascar ragwort plant herbaceous not present moderate USDA Plant/Pest
Senecio linearifolius narrowleaf ragwort plant herbaceous not present low CDFA
Senecio jacobaea tansy ragwort plant herbaceous limited n/a (already in CA) CDFA
Senecio inaequidens South African ragwort plant woody not present low USDA Plant/Pest
Secale cereale cereal rye plant grass widespread n/a (already in CA) WA Weed List
Scolymus hispanicus golden thistle plant herbaceous limited n/a (already in CA) CDFA
Schismus barbatus mediterraneangrass plant grass widespread n/a (already in CA) Cal-IPC list
Schismus arabicus mediterraneangrass plant grass widespread n/a (already in CA) Cal-IPC list
Schinus terebinthifolius Brazilian peppertree plant woody limited n/a (already in CA) Cal-IPC list
Schinus molle Peruvian peppertree plant woody limited n/a (already in CA) Cal-IPC list
Sargassum muticum Sargassum muticum plant algae limited low Hoffman NOAA
Sargassum horneri Asian seaweed plant algae limited moderate Hoffman NOAA
Saponaria officinalis bouncingbet 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
Salvinia molesta giant salvinia plant herbaceous limited n/a (already in CA) Cal-IPC list
Salvinia herzogii giant salvinia plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Salvinia biloba giant salvinia plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Salvinia auriculata giant salvinia plant herbaceous not present low USDA Plant/Pest
Salvia virgata southern meadow sage plant herbaceous not present moderate CDFA
Salvia sclarea clary sage plant herbaceous not present moderate WA Weed List