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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
Ischaemum rugosum murainograss plant grass not present low USDA Plant/Pest
Isavirus isa Infectious Salmon Isavirus Anemia (ISA) disease virus VALUE REQUIRED VALUE REQUIRED No list
Isatis tinctoria dyer's woad plant herbaceous widespread n/a (already in CA) CDFA
Ipomovirus cbsv Cassava Brown Streak Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Ipomoea triloba three-cornered morning glory plant herbaceous limited n/a (already in CA) AZ Weed List
Ipomoea aquatica swamp morningglory plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Inopus rubriceps Australian sod fly arthropod fly limited n/a (already in CA) CDFA (reg. B)
Influenzavirus hpav Highly Pathogenic Avian Influenza disease virus VALUE REQUIRED VALUE REQUIRED CDFA AHFSS
Imperata cylindrica cogongrass plant grass not present moderate USDA Plant/Pest
Imperata brasiliensis Brazilian satintail plant grass not present low USDA Plant/Pest
Impatiens glandulifera policeman's helmet plant herbaceous not present moderate OR Weed List
Ilynassa obsoleta Eastern mudsnail invertebrate aquatic mollusk, marine limited n/a (already in CA) Exoticsguide
Ilex aquifolium English holly plant woody limited n/a (already in CA) Cal-IPC list
Ilarvirus apmv Apple mosaic virus disease virus VALUE REQUIRED VALUE REQUIRED No list
Iguana iguana Green iguana vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Icterus pectoralis Spot-breasted oriole vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Ichthyophithirius multifilis Parsitic protozoan of fish invertebrate nematode VALUE REQUIRED VALUE REQUIRED No list
Icerya aegyptiaca Egyptian fluted scale arthropod scale, aphid not present moderate USDA Plant/Pest
Hypothenemus hampei coffee berry borer arthropod beetle not present moderate USDA Plant/Pest
Hypophthalmichthys nobilis Bighead Carp vertebrate fish not present high Lacey Act
Hypophthalmichthys molitrix Silver Carp vertebrate fish not present moderate Cal Code 14:671
Hypophthalmichthys harmandi Largescale Carp vertebrate fish not present moderate Cal Code 14:671
Hypochaeris radicata rough catsear plant herbaceous widespread n/a (already in CA) Cal-IPC list
Hypochaeris glabra smooth catsear plant herbaceous widespread n/a (already in CA) CO Weed List
Hyperoides humilis weevil arthropod beetle limited n/a (already in CA) CDFA (reg. B)
Hypericum perforatum common St. John's wort plant herbaceous widespread n/a (already in CA) CDFA
Hypericum canariense Canary Island hypericum plant woody limited n/a (already in CA) CDFA
Hyoscyamus niger black henbane plant herbaceous limited n/a (already in CA) CDFA
Hylurgus ligniperda redhaired pine bark beetle arthropod beetle not present high CDFA (reg. B)
Hylotrupes bajulus old house borer arthropod beetle not present high CDFA (reg. A)
Hylobius pales pales weevil arthropod beetle not present high CDFA (reg. A)
Hylastinus obscurus clover root borer arthropod beetle limited n/a (already in CA) CDFA (reg. B)
Hygrophila polysperma Miramar weed plant herbaceous not present high CDFA
Hydrocharis morsus-ranae European frog-bit plant herbaceous not present moderate WA Weed List
Hydrilla verticillata hydrilla plant herbaceous limited n/a (already in CA) CDFA
Howardia biclavis mining scale arthropod scale, aphid not present high CDFA (reg. A)
Horidiplosis ficifolii Ornamental fig pest arthropod fly not present low Univ. Florida
Hordeum murinum Mediterranean barley plant grass widespread n/a (already in CA) Cal-IPC list
Hordeum marinum Mediterranean barley plant grass widespread n/a (already in CA) Cal-IPC list
Homeria spp. cape tulip plant herbaceous not present low USDA Plant/Pest
Homalodisca vitripennis glassy-winged sharpshooter arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Homaledra sabalella palm leafskeletonizer arthropod butterfly, moth limited n/a (already in CA) CDFA (reg. B)
Holotrichia mindanaona white grub arthropod beetle not present moderate USDA Plant/Pest
Holcus lanatus common velvet grass plant grass widespread n/a (already in CA) Cal-IPC list
Hirschfeldia incana shortpod mustard plant herbaceous widespread n/a (already in CA) Cal-IPC list
Hieracium x floribundum yellow devil hawkweed plant herbaceous not present moderate MT Weed List
Hieracium piloselloides king devil hawkweed plant herbaceous not present moderate MT Weed List
Hieracium pilosella mouseear hawkweed plant herbaceous not present moderate OR Weed List
Hieracium laevigatum smooth hawkweed plant herbaceous not present low WA Weed List
Hieracium glomeratum queen devil hawkweed plant herbaceous not present low WA Weed List
Hieracium caespitosum yellow hawkweed plant herbaceous not present high ID Weed List
Hieracium aurantiacum orange hawkweed plant herbaceous not present high WA Weed List
Hieracium atratum polar hawkweed plant herbaceous not present low WA Weed List
Hesperis matronalis dame's rocket plant herbaceous limited n/a (already in CA) CO Weed List
Herpestes auropunctatus Small Indian mongoose vertebrate mammal VALUE REQUIRED VALUE REQUIRED Lacey Act
Heracleum mantegazzianum giant hogweed plant herbaceous not present high CDFA
Hemitragus jemlahicus Himalayan tahr vertebrate mammal VALUE REQUIRED n/a (already in CA) DFG Code 2118
Hemiphyllodactylus typus Indo-Pacific tree gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED Witmer et al
Hemimene juliana nut fruit tortrix arthropod butterfly, moth not present low USDA Plant/Pest
Hemileia vastatrix Coffee Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Hemileia vastatrix Yellow ring mosaic agent (assoc. with Jasminum) disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Hemidactylus turcicus Mediterranean gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Hemidactylus platyurus Asian flat-tailed gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED Witmer et al
Hemidactylus mabouia Tropical house gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Hemidactylus garnotti Indo-Pacific gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Hemidactylus frenatus Common house gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Hemicycliophora arenaria sheath nematode invertebrate nematode unknown n/a (already in CA) CDFA (reg. A)
Hemiberlesia palmae tropical palm scale arthropod scale, aphid not present high CDFA (reg. A)
Heliocoverpa armigera (Hübner) cotton bollworm arthropod butterfly, moth not present high CDFA (reg. A)
Helicoverpa hawaiiensis Hawaiian bud moth arthropod butterfly, moth not present moderate CDFA (reg. A)
Helichrysum petiolare licoriceplant plant woody limited n/a (already in CA) Cal-IPC list
Helianthus ciliaris blueweed plant herbaceous limited n/a (already in CA) CDFA
Heilipus lauri avocado seed weevil arthropod beetle not present high CDFA (reg. A)
Hedera hibernica English ivy plant woody not present high WA Weed List
Hedera helix English ivy plant woody widespread n/a (already in CA) Cal-IPC list
Hedera canariensis Algerian ivy plant woody widespread n/a (already in CA) Cal-IPC list
Harrisina brillians western grapeleaf skeletonizer arthropod butterfly, moth widespread n/a (already in CA) CDFA (reg. B)
Harrisina americana grapeleaf skeletonizer arthropod butterfly, moth not present high CDFA (reg. A)
Harmonia axyridis Multicolored asian ladybeetle arthropod beetle not present high USDA pest
Haplothrips chinensis thrips arthropod thrips not present high USDA Plant/Pest
Halysidota tessellaris pale tussock moth arthropod butterfly, moth not present moderate CDFA (reg. A)
Halyomorpha halys Brown marmorated stink bug arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Halogeton glomeratus halogeton plant herbaceous limited n/a (already in CA) CDFA
Halimodendron halodendron Russian salttree plant woody not present moderate CDFA
Gyrodactylus elegans Parasitic flatworm of fish invertebrate nematode VALUE REQUIRED VALUE REQUIRED No list
Gypsophila paniculata baby's breath plant herbaceous limited n/a (already in CA) CDFA
Gymnosporangium asiaticum Rust: Pear and Juniper disease fungus not present VALUE REQUIRED APHIS OPIS
Gymnocephalus cernuus Ruffe vertebrate fish not present moderate Harmful U.S. NIS
Gymnaspis aechmeae aechmea scale arthropod scale, aphid not present high CDFA (reg. A)
Guignardia piricola Leaf, Branch, and Fruit Disease disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Guignardia musae Freckle disease of Banana disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Guignardia citricarpa Citrus Black Spot disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Gremmeniella abietina Scleroderris Canker disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Grateloupia turuturu Asian red seaweed plant algae VALUE REQUIRED VALUE REQUIRED Hoffman NOAA
Graphocephala versuta versute sharpshooter arthropod scale, aphid limited moderate CDFA (reg. B)
Gracula religiosa Hill mynah vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al
Gonodonta pyrgo citrus fruitpiercing moth arthropod butterfly, moth not present moderate CDFA (reg. A)
Gonatodes albogularis Yellow-headed gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Glyceria declinata waxy mannagrass plant grass limited n/a (already in CA) Cal-IPC list
Glossostigma diandrum mud mat plant herbaceous not present low WA Weed List