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CISAC has compiled the list below of over 1,700 species known to be invasive in California or a potential threat for introduction to the state. Please use the comment form below to let us know about: taxa that should be added or removed; species information that you would change; and species that you think should be a high priority for having a scorecard completed (choose Review Scorecards to see the list of scorecards already drafted). Make sure to click Save. Previous comments are displayed at the bottom of the page.

Download Species List (.csv) (to open in a Spreadsheet program)
This data download is provided to aid in the review of the draft invasive species list. We discourage other use of this data until it has been revised and finalized.

Scientific Namesort icon Common Name Type Subtype Extent Risk of Introduction First Source
Castor canadensis Beaver vertebrate mammal widespread n/a (already in CA) Cal Code 14:671
Cataenococcus olivaceus yucca mealybug arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Cathartus quadricollis squarenecked grain beetle arthropod beetle not present high CDFA (reg. A)
Caulacanthus ustulatus red algae plant algae unknown VALUE REQUIRED Hoffman NOAA
Caulerpa brachypus Caulerpa brachypus plant algae unknown high Hoffman NOAA
Caulerpa racemosa Caulerpa racemosa plant algae VALUE REQUIRED high Hoffman NOAA
Caulerpa taxifolia Mediterranean strain plant algae limited high OR Weed List
Celama sorghiella sorghum webworm arthropod butterfly, moth not present moderate CDFA (reg. A)
Cenchrus echinatus southern sandbur plant grass widespread n/a (already in CA) CDFA
Cenchrus incertus coast sandbur plant grass widespread n/a (already in CA) CDFA
Cenchrus longispinus mat sandbur plant grass widespread n/a (already in CA) CDFA
Centaurea calcitrapa purple starthistle plant herbaceous widespread n/a (already in CA) CDFA
Centaurea debeauxii meadow knapweed plant herbaceous limited n/a (already in CA) Cal-IPC list
Centaurea diffusa diffuse knapweed plant herbaceous limited n/a (already in CA) CDFA
Centaurea iberica Iberian starthistle plant herbaceous limited n/a (already in CA) CDFA
Centaurea jacea brown knapweed plant herbaceous limited n/a (already in CA) WA Weed List
Centaurea macrocephala bighead knapweed plant herbaceous not present moderate WA Weed List
Centaurea melitensis Malta starthistle plant herbaceous widespread n/a (already in CA) CDFA
Centaurea nigra black knapweed plant herbaceous limited n/a (already in CA) WA Weed List
Centaurea solstitialis yellow starthistle plant herbaceous widespread n/a (already in CA) CDFA
Centaurea stoebe ssp. micranthos spotted knapweed plant herbaceous limited n/a (already in CA) AZ Weed List
Centaurea sulphurea Sicilian thistle plant herbaceous limited n/a (already in CA) CDFA
Centaurea virgata ssp. Squarrosa squarrose knapweed plant herbaceous limited n/a (already in CA) Cal-IPC list
Ceratitis capitata Mediterranean fruit fly arthropod fly not present moderate CDFA (reg. A)
Ceratitis rosa Natal fruit fly arthropod fly not present moderate CDFA (reg. A)
Ceratitis spp. Ceratitis spp. arthropod fly limited high USDA Plant/Pest
Ceratocystis (Ophiostoma) ulmi Dutch elm disease disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Ceratocystis fagacearum Oak wilt disease fungus not present moderate USDA Plant/Pest
Ceratocystis fimbriata black rot disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Ceratocystis moniliformis Cocoa ceratocystis wilt disease fungus VALUE REQUIRED VALUE REQUIRED USDA Plant/Pest
Ceratocystis nothogafi Blue Stain Fungus disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Ceratocystis novae-zelandiae wood-staining disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Ceratocystis tenella Blue Stain disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Cercopithecus aethiops Vervet monkey vertebrate mammal VALUE REQUIRED n/a (already in CA) FL FWCC NNS List
Cercospora pini-densiflorae Needle blight disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Cerodontha iridophora leafminer fly arthropod fly not present moderate CDFA (reg. A)
Ceroplastes ceriferus Indian wax scale arthropod scale, aphid not present high CDFA (reg. A)
Ceroplastes floridensis Florida wax scale arthropod scale, aphid not present high CDFA (reg. A)
Ceroplastes rubens red wax scale arthropod scale, aphid not present high CDFA (reg. A)
Ceroplastes rusci fig wax scale arthropod scale, aphid not present high CDFA (reg. A)
Cerotoma trifurcata bean leaf beetle arthropod beetle not present high CDFA (reg. A)
Cervus axis Axis deer vertebrate mammal limited n/a (already in CA) Cal Code 14:671
Cervus dama Fallow deer vertebrate mammal limited n/a (already in CA) Cal Code 14:671
Cervus duvauceli Swamp deer vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Cervus elaphus Wapiti vertebrate mammal VALUE REQUIRED n/a (already in CA) ISSG 100WorstIAS
Cervus Nippon Sika deer vertebrate mammal VALUE REQUIRED VALUE REQUIRED Harmful U.S. NIS
Cervus unicolor Sambar deer vertebrate mammal VALUE REQUIRED n/a (already in CA) FL FWCC NNS List
Cettia diphone Japanese bush warbler vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al
Chaenorhinum minus dwarf snapdragon plant herbaceous not present moderate WA Weed List
Chalara australis Vascular stain fungus disease fungus VALUE REQUIRED VALUE REQUIRED USDA Plant/Pest
Chalcodermus aeneus cowpea curculio arthropod beetle not present high CDFA (reg. A)
Chamaeleo calyptratus Veiled chameleon vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Chamaeleo jacksonii Jackson’s chameleon vertebrate reptile VALUE REQUIRED VALUE REQUIRED Witmer et al
Channa argus Northern Snakehead vertebrate fish not present moderate Cal Code 14:671
Chelydra serpentine Snapping turtle vertebrate reptile not present moderate Cal Code 14:671
Chelymorpha cassidea argus tortoise beetle arthropod beetle limited n/a (already in CA) CDFA (reg. B)
Chilo plejadellus rice stalk borer arthropod butterfly, moth not present moderate CDFA (reg. A)
Chilo suppressalis Asiatic rice borer arthropod butterfly, moth not present high CDFA (reg. A)
Chionaspis americana elm scurfy scale arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Chionaspis furfura scurfy scale arthropod scale, aphid not present high CDFA (reg. A)
Chondrilla juncea rush skeletonweed plant herbaceous limited n/a (already in CA) CDFA
Chorispora tenella blue mustard plant herbaceous limited n/a (already in CA) CDFA
Choristoneura fumiferana spruce budworm arthropod butterfly, moth not present moderate CDFA (reg. A)
Chrysanthemum coronarium crown daisy plant herbaceous limited n/a (already in CA) Cal-IPC list
Chrysemys picta Painted turtle vertebrate reptile VALUE REQUIRED n/a (already in CA) DFG Code 2118
Chrysis spp. cuckoo wasps arthropod bee, wasp not present moderate USDA Plant/Pest
Chrysodeixis chalcites golden twin spot moth arthropod butterfly, moth not present moderate CDFA (reg. A)
Chrysodeixis eriosoma green garden looper arthropod butterfly, moth not present low CDFA (reg. A)
Chrysolina bankii leaf beetle arthropod beetle limited n/a (already in CA) CDFA (reg. B)
Chrysomyxa abietis Spruce Needle Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Chrysomyxa himalensis Spruce Needle Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Chrysomyxa ledi var. rhododendri Rhododendron-spruce Needle Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Chrysophtharta m-fuscum paropsine leaf beetle arthropod beetle limited n/a (already in CA) CDFA (reg. B)
Chrysopogon aciculatus pilipiliula plant grass not present low USDA Plant/Pest
Cichlasoma salvini Yellowbelly cichlid vertebrate fish not present low Cal Code 14:671
Cichlasoma spilurum Blue-eyed cichlid vertebrate fish not present high Cal Code 14:671
Cichorium intybus chicory plant herbaceous widespread n/a (already in CA) CO Weed List
Cilivirus cilv-c Citrus leprosis virus C disease virus not present high Acarology Journa
Cirsium arvense Canada thistle plant herbaceous widespread n/a (already in CA) CDFA
Cirsium japonicum Japanese thistle plant herbaceous not present low CDFA
Cirsium ochrocentrum yellowspine thistle plant herbaceous limited n/a (already in CA) CDFA
Cirsium undulatum wavyleaf thistle plant herbaceous limited n/a (already in CA) CDFA
Cirsium vulgare bull thistle plant herbaceous widespread n/a (already in CA) Cal-IPC list
Cladophora spp. green algae plant algae limited VALUE REQUIRED Hoffman NOAA
Clarias batrachus Walking catfish vertebrate fish not present moderate Cal Code 14:671
Clathria polifera Red beard sponge invertebrate other limited n/a (already in CA) Exoticsguide
Clavaspis herculeana herculeana scale arthropod scale, aphid not present high CDFA (reg. A)
Claviceps spp. Sorghum Ergot disease fungus limited VALUE REQUIRED APHIS OPIS
Clematis orientalis Chinese clematis plant herbaceous not present high CO Weed List
Clematis vitalba old man's beard plant herbaceous limited n/a (already in CA) OR Weed List
Clethrionomys rutilus Red-backed vole vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Closteroviridae byvd Blackberry Yellow Vein Disease disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Closterovirus CTV Citrus tisteza virus disease virus limited moderate APHIS OPIS
Closterovirus wylv or Prosopis fiebrigii ? Wheat Yellow Leaf Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Cnemidophorus lemniscatus Rainbow whiptail lizard vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Cnemidophorus motaguae Giant whiptail lizard vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Cnemidophorus neomexicanus New Mexico whiptail lizard vertebrate reptile VALUE REQUIRED VALUE REQUIRED Witmer et al
Cnemidophorus velox Plateau striped whiptail vertebrate reptile VALUE REQUIRED VALUE REQUIRED Witmer et al
Cocadviroid cccvd Coconut Cadang-Cadang Viroid disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Coccotorus scutellaris plum gouger arthropod beetle not present moderate CDFA (reg. A)