California Invasive Plant Inventory Database

Before looking at this database, please read the information on the Invasive Plant Inventory, including how plants were listed and what the ratings mean.

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Selecting a floristic province will show only plants found in all regions of that province, not those found in only one or a few regions. Select an individual region to see all plants found there.

• CA Floristic Province (CA-FP)
  • Cascade Range (CaR)
  • Central West (CW)
  • Great Valley (GV)
  • Northwest (NW)
  • Sierra Nevada (SN)
  • Southwest (SW)

• Great Basin Province (GB)
  • Modoc Plateau (MP)
  • Sierra Nevada East (SNE)
• Desert Province (D)
  • Mojave Desert (DMoj)
  • Sonoran Desert (DSon)

• Plants invasive in all provinces (All CA)

     > See map of regions

     > See abbreviation and scores key

     > Read how the Inventory was compiled.

Click on column heading to sort the table. Click on the scientific name for the Plant Assessment Form, or the icon for the Plant Profile. You can also download a tab-delimited file of this data which can be imported into Microsoft Excel or other programs.

Scientific Name	Common Name	Rating	Alert	Imp.	Inv.	Dis.	Doc.	Regions	Habitats of Concern and Comments
Acroptilon repens	Russian knapweed	2Moderate		B	B	B	3.2	·CA-FP ·GB	Scrub, grasslands, riparian, pinyon-juniper woodland, forest. Severe impacts in other western states. Spreading in many areas of CA.
Aegilops triuncialis	barb goatgrass	1High		A	A	B	3.6	·CaR ·CW ·GV ·SN ·MP	Grassland, oak woodland; spreading in NW and in Central Valley.
Aeschynomene rudis	rough jointvetch	4Eval No List		D	C	D	3.2	·GV	Serious agricultural weed, but not known to have impacts in wildlands.
Agrostis avenacea	Pacific bentgrass	3Limited		C	C	C	2.4	·CW ·GV ·NW ·SN ·SW	Vernal pools, coastal prairie, meadows, grasslands. Impacts are low in most areas.
Agrostis stolonifera	creeping bentgrass	3Limited		C	B	C	1.9	·CW ·GV ·NW ·SN ·SW	Wetlands, riparian; grown for domestic forage. Limited distribution and impacts unknown.
Ailanthus altissima	tree-of-heaven	2Moderate		B	B	B	3.0	·CA-FP ·GB	Riparian areas, grasslands, oak woodland. Impacts highest in riparian areas.
Aira caryophyllea	silver hairgrass	4Eval No List		D	C	A	2.6	·CA-FP	Widespread in grasslands, but impacts appear negligible.
Alhagi maurorum	camelthorn	2Moderate		B	B	B	3.2	·GV ·SW ·SNE ·D	Grassland, meadows, riparian and desert scrub, Sonoran thorn woodland. Very invasive in southwestern states. Limited distribution in CA.
Alternanthera philoxeroides	alligator weed	1High	Alert	A	B	C	2.9	·GV ·SW	Freshwater aquatic systems, including marshes
Anthemis cotula	mayweed chamomile, dog fennel	4Eval No List		D	B	B	2.4	·CW ·GV ·NW ·SN ·SW	Abiotic and wildife impacts unknown
Arundo donax	giant reed	1High		A	B	A	2.8	·CW ·GV ·NW ·SN ·SW ·D	Riparian areas, commercially grown for musical instrument reeds, structural material, etc.
Asphodelus fistulosus	onionweed	2Moderate	Alert	B	A	C	2.9	·GV ·SW	Coastal dunes, prairie, grasslands. More invasive in Australia. High invasiveness but limited distribution in CA.
Atriplex semibaccata	Australian saltbush	2Moderate		B	B	B	2.9	·All CA	Coastal grasslands, scrub, upper salt marsh. Limited distribution, but can be very invasive regionally.
Bassia hyssopifolia	fivehook bassia	3Limited		C	C	B	2.7	·All CA	Alkaline habitats. Weed of agriculture or disturbed sites. Impacts minor in wildlands.
Brachypodium distachyon	annual false-brome, false brome, purple false broom, stiff brome	2Moderate		B	B	B	2.6	·CaR ·CW ·GV ·SN	Valley and foothill grassland, cimontane woodland
Brassica nigra	black mustard	2Moderate		B	B	A	2.0	·CA-FP	Widespread. Primarily a weed of disturbed sites, but can be locally a more significant problem in wildlands.
Brassica rapa	birdsrape mustard, field mustard	3Limited		C	B	B	1.8	·CA-FP ·SNE	Coastal scrub, grasslands meadows, riparian. Primarily in disturbed areas, Impacts appear to be minor or unknown in wildlands.
Bromus diandrus	ripgut brome	2Moderate		B	B	A	3.3	·All CA	Dunes, scrub, grassland, woodland, forest. Very widespread, but monotypic stands uncommon.
Bromus hordeaceus	soft brome	3Limited		B	C	A	2.8	·All CA	Grasslands, sagebrush, serpentine soils, many other habitats. Very widespread, but primarily in converted annual grasslands.
Bromus japonicus	Japanese brome, Japanese chess	3Limited		B	C	B	2.6	·CA-FP ·GB ·D	Great Basin grassland, valley and foothill grassland, pinon and juniper woodland, lower montane coniferous forest
Bromus madritensis ssp. rubens	red brome	1High		A	B	A	3.0	·All CA	Scrub, grassland, desert washes, woodlands
Cardaria chalepensis	lens-podded white-top	2Moderate	Alert	B	B	C	3.2	·CA-FP ·GB	Central Valley wetlands. Limited distribution in CA. May not be as invasive as C. draba.
Cardaria pubescens	hairy whitetop	3Limited		C	B	C	2.5	·GV ·SW	Grasslands and meadows. Impacts unknown but may be significant in meadows of CaR.
Carduus pycnocephalus	Italian thistle	2Moderate		B	B	A	2.9	·CW ·GV ·NW ·SN ·SW ·DMoj	Forest, scrub, grasslands, woodland. Very widespread. Impacts may be variable regionally.
Centaurea calcitrapa	purple starthistle	2Moderate		B	B	B	2.7	·CW ·GV ·NW ·SN ·SW ·MP	Grasslands. Impacts regionally variable. Distribution relatively limited.
Centaurea maculosa	spotted knapweed	1High		A	B	B	3.4	·CA-FP ·GB	Riparian, grasslands, wet meadows, forests. More widely distributed in other western states.
Centaurea solstitialis	yellow starthistle	1High		A	B	A	3.0	·CA-FP	Grasslands, woodlands, occasionally riparian
Chondrilla juncea	rush skeletonweed	2Moderate		B	B	B	3.1	·CaR ·CW ·GV ·NW ·SN	Grasslands. Very invasive in other western states, but currently limited in distribution in CA.
Chorispora tenella	blue mustard	4Eval No List		U	C	C	1.5	·CaR ·GV ·SW ·GB	Impacts unknown
Cirsium arvense	Canada thistle	2Moderate		B	B	B	2.8	·CA-FP ·DMoj	Grasslands, riparian areas, forests. Severe impacts in other western states. Limited distribution in CA.
Cirsium vulgare	bull thistle	2Moderate		B	B	B	3.3	·CA-FP ·GB	Riparian areas, marshes, meadows. Widespread, can be very problematic regionally.
Conium maculatum	poison-hemlock	2Moderate		B	B	B	2.8	·CA-FP	Riparian woodland, grassland. Widespread in disturbed areas. Abiotic impacts unknown. Impacts can vary locally.
Convolvulus arvensis	field bindweed	4Eval No List		C	B	B	3.5	·All CA	Only known as agricultural weed
Cynodon dactylon	bermudagrass	2Moderate		B	B	B	3.3	·CA-FP ·D	Riparian scrub in southern CA. Common landscape weed, but can be very invasive in desert washes.
Cynosurus echinatus	hedgehog dogtailgrass	2Moderate		B	B	A	2.5	·CW ·GV ·NW ·SN ·SW	Oak woodland, grassland. Widespread, impacts vary regionally, but typically not in monotypic stands.
Cytisus scoparius	Scotch broom	1High		A	B	A	3.2	·CA-FP	Coastal scrub, oak woodland, horticultural varieties may also be invasive.
Dactylis glomerata	orchardgrass	3Limited		C	B	B	2.9	·CA-FP ·GB	Grasslands, broadleaved forest, woodlands; common forage species. Impacts appear to be minor.
Daucus carota	wild carrot, Queen Anne's lace	4Eval No List		D	C	B	2.7	·All CA	Very widespread, but primarily in disturbed sites, particularly roadsides
Descurainia sophia	flixweed, tansy mustard	3Limited		C	B	B	1.9	·All CA	Scrub, grassland, woodland. Impacts appear to be minor, but locally more invasive in NE CA.
Dimorphotheca sinuata	African daisy	4Eval No List		D	C	B	1.8	·CW ·GV ·SW	Impacts to abiotic processes and plant communities unknown
Dittrichia graveolens	stinkwort	2Moderate	Alert	B	A	C	3.0	·CW ·GV ·NW ·SN ·SW	Grasslands, riparian scrub. Spreading rapidly, impacts may become more important in future.
Egeria densa	Brazilian egeria	1High		A	A	B	3.1	·GV ·SN ·SW ·SNE	Streams, ponds, sloughs, lakes, Sacramento-San Joaquin Delta.
Eichhornia crassipes	water hyacinth	1High	Alert	A	A	C	3.2	·CW ·GV ·SW	Aquatic systems in Sacramento-San Joaquin Delta
Elaeagnus angustifolia	Russian-olive	2Moderate		B	A	B	3.3	·CW ·GV ·SW ·SNE ·DMoj	Interior riparian. Impacts more severe in other western states. Current distribution limited in CA.
Erodium botrys	broadleaf filaree	4Eval No List		D	C	A	2.8	·CA-FP	Present in wildlands but known impacts are negligible. Often transient.
Erodium brachycarpum	short-fruited filaree	4Eval No List		C	C	A	2.6	·CA-FP	Present in wildlands but known impacts are negligible.Often transient.
Erodium cicutarium	redstem filaree	3Limited		C	C	A	3.1	·All CA	Many habitats. Widespread. Impacts minor in wildlands. High-density populations transient.
Erodium moschatum	whitestem filaree	4Eval No List		D	C	A	2.7	·CA-FP	Primarily an agricultural weed, little impact in wildlands.
Eucalyptus camaldulensis	red gum	3Limited		C	C	C	2.2	·CW ·GV ·NW ·SW	Mainly southern CA urban areas. Impacts, invasiveness and distribution all minor.
Eucalyptus globulus	Tasmanian blue gum	2Moderate		B	B	B	2.8	·CW ·GV ·NW ·SW	Riparian areas, coastal grasslands, scrub. Impacts can be much higher in coastal areas.
Euphorbia lathyris	caper spurge	4Eval No List		D	C	B	2.2	·CW ·GV ·NW ·SW	Abiotic impacts unknown
Euphorbia oblongata	oblong spurge	3Limited		C	C	B	2.0	·CaR ·CW ·GV ·NW ·SN	Meadows, woodlands. Limited distribution. Impacts unknown. Locally in dense stands.
Festuca arundinacea	tall fescue	2Moderate		B	B	A	2.9	·CA-FP	Coastal scrub, grasslands; common forage grass. Widespread, abiotic impacts unknown.
Ficus carica	edible fig	2Moderate		B	A	B	2.6	·CW ·GV ·SW	Riparian woodland. Can spread rapidly. Abiotic impacts unknown. Can be locally very problematic.
Foeniculum vulgare	fennel	1High		A	B	A	3.0	·CA-FP	Grasslands, scrub.
Geranium dissectum	cutleaf geranium	2Moderate		C	B	A	1.7	·CA-FP	Numerous habitats but impacts appear minor.
Geranium molle	dovefoot geranium	4Eval No List		D	B	A	1.7	·CA-FP	Present in wildlands, but known impacts are negligible
Gleditsia triacanthos	honey locust	4Eval No List		D	B	C	3.3	·GV	Impacts unknown and distribution very limited
Glyceria declinata	waxy mannagrass	2Moderate		B	B	B	1.9	·GV ·SW	Vernal pools, moist grasslands. Often confused with native Glyceria. Impacts largely unknown, but may be significant in vernal pools.
Hedera helix, H. canariensis	English ivy, Algerian ivy	1High		A	A	A	2.7	·CA-FP	Coastal forests, riparian areas. Species combined due to genetics questions.
Hirschfeldia incana	shortpod mustard, summer mustard	2Moderate		B	B	A	1.9	·CW ·GV ·NW ·SN ·SW ·DMoj	Scrub, grasslands, riparian areas. Impacts not well understood, but appear to be greater in southern CA.
Holcus lanatus	common velvet grass	2Moderate		B	B	A	2.9	·CA-FP ·GB ·DMoj	Coastal grasslands, wetlands. Impacts can be more severe locally, especially in wetland areas.
Hordeum marinum, H. murinum	Mediterranean barley, hare barley, wall barley	2Moderate		B	B	A	2.8	·All CA	Grasslands; H. marinum invades drier habitats, while H. murinum invades wetlands. Widespread, but generally do not form dominant stands.
Hydrilla verticillata	hydrilla	1High	Alert	A	B	C	3.2	·GV ·NW ·SN ·SW ·D	Freshwater aquatic systems. The most important submerged aquatic invasive in southern states.
Hypericum perforatum	common St. John's wort, klamathweed	2Moderate		B	B	B	3.7	·CW ·GV ·NW ·SW	Many northern CA habitats. Abiotic impacts low. Biological control agents have reduced overall impact.
Hypochaeris glabra	smooth catsear	3Limited		C	B	B	3.1	·CA-FP	Scrub and woodlands. Widespread. Impacts appear to be minor. Some local variability.
Hypochaeris radicata	rough catsear, hairy dandelion	2Moderate		C	B	A	2.2	·CA-FP	Coastal dunes, scrub, and prairie; woodland, forest. Widespread. Impacts unknown or appear to be minor.
Iris pseudacorus	yellowflag iris	3Limited		C	B	C	2.3	·CaR ·CW ·GV ·NW ·SW	Riparian, wetland areas, esp. southern CA. Limited distribution. Abiotic impacts unknown.
Kochia scoparia	kochia	2Moderate		B	C	B	3.2	·CW ·GV ·SW ·GB ·D	Scrub, chaparral, grasslands
Lactuca serriola	prickly lettuce	4Eval No List		D	B	B	3.1	·All CA	Primarily an agricultural and roadside weed
Lepidium latifolium	perennial pepperweed, tall whitetop	1High		A	A	A	3.1	·CA-FP ·GB ·DMoj	Coastal and inland marshes, riparian areas, wetlands, grasslands; potential to invade montane wetlands.
Linaria genistifolia ssp. dalmatica	Dalmation toadflax	2Moderate		B	B	B	2.8	·CA-FP	Grasslands, forest clearings. Limited distribution. More severe impacts in other western states.
Linaria vulgaris	yellow toadflax, butter and eggs	2Moderate		B	B	B	2.3	·CA-FP	valley and foothill grassland, Great Basin grassland, riparian woodland, lower montane coniferous forest, upper montane coniferous forest
Lolium multiflorum	Italian ryegrass	2Moderate		A	B	A	2.6	·CA-FP	Grasslands, oak woodland, pinyon-juniper woodland; widely used for post-fire erosion control. Widespread. Impacts can vary with region.
Lotus corniculatus	birdsfoot trefoil	4Eval No List		D	B	B	2.8	·CA-FP ·GB	Primarily a turf or agricultural weed in CA
Ludwigia peploides ssp. montevidensis	creeping water-primrose	1High		A	B	B	2.5	·CW ·GV ·NW ·SN ·SW ·DMoj	Freshwater aquatic systems. Clarification needed on taxonomic identification.
Lythrum hyssopifolium	hyssop loosestrife	3Limited		C	B	B	3.0	·CA-FP	Grasslands, wetlands, vernal pools. Widespread. Impacts unknown, but appear to be minor.
Lythrum salicaria	purple loosestrife	1High		A	A	B	3.8	·GV ·NW ·SW ·MP	Wetlands, marshes, riparian areas
Marrubium vulgare	white horehound	3Limited		C	C	B	2.8	·CA-FP ·DMoj	Grasslands scrub, riparian areas. Widespread. Rarely in dense stands. Impacts relatively minor.
Medicago polymorpha	California burclover	3Limited		C	C	A	2.8	·CA-FP	Grasslands. Widespread weed of agriculture and disturbed areas. Impacts in wildlands minor.
Melilotus officinalis	yellow sweetclover	4Eval No List		D	C	C	3.3	·CA-FP ·GB	Present in human-disturbed habitats only
Mentha pulegium	pennyroyal	2Moderate		C	A	A	2.7	·CW ·GV ·NW ·SW	Vernal pools, wetlands. Poisonous to livestock. Spreading rapidly. Impacts largely unknown.
Myosotis latifolia	common forget-me-not	3Limited		C	B	B	2.2	·CA-FP ·DMoj	Coniferous forest, riparian. Little information on impacts.
Myriophyllum spicatum	Eurasian watermilfoil	1High		A	A	B	2.8	·CW ·GV ·SN	Freshwater aquatic systems
Nerium oleander	oleander	4Eval No List		D	B	D	2.6	·CaR ·GV	Not known to be invasive, although reported from riparian areas in Central Valley and San Bernardino Mtns
Nicotiana glauca	tree tobacco	2Moderate		B	B	B	2.5	·GV ·NW ·SN ·SW ·D	Coastal scrub, grasslands, riparian woodland. Abiotic impacts unknown. Impacts vary locally. Rarely in dense stands.
Nothoscordum gracile	false garlic	4Eval No List		D	B	D	2.1	·CW ·GV ·SW	Mainly an urban garden weed.
Nymphaea odorata	fragrant waterlily	4Eval No List		D	B	C	2.3	·GV ·SN ·SW	Present only at one site.
Olea europaea	olive	3Limited		C	B	B	2.5	·CW ·GV ·NW ·SW	A problem in Australia. Currently a rare escape in CA but is of concern due to the possibility of spread from planted groves.
Onopordum acanthium	Scotch thistle	1High		B	B	B	2.9	·CA-FP ·MP	Wet meadows, sage brush, riparian areas
Oxalis corniculata	creeping woodsorrel	4Eval No List		D	C	C	2.2	·All CA	Primarily a turf weed in CA
Parkinsonia aculeata	Mexican Palo Verde	4Eval No List		D	B	D	2.2	·GV ·SW	Has not escaped into wildland enough to cause impacts.
Pennisetum setaceum	crimson fountaingrass	2Moderate		B	B	B	2.9	·CW ·GV ·SW ·D	Coastal dunes and scrub, chaparral, grasslands. Some horticultural cultivars sterile. Very invasive in Hawaii.
Phragmites australis	common reed	5Native		B	B	B	2.5	·All CA	Genetic issues make it unclear which strains are native to CA.
Phytolacca americana	common pokeweed	3Limited		C	B	C	2.8	·CA-FP	riparian forest, riparian woodland
Picris echioides	bristly oxtongue	3Limited		C	B	B	2.4	·CA-FP	Coastal prairie, scrub, riparian woodland. Widespread locally. Abiotic impacts unknown.
Piptatherum miliaceum	smilograss	3Limited		C	B	B	2.4	·CW ·GV ·NW ·SN ·SW	Coastal dunes, scrub, riparian, grassland. Expanding range. Impacts largely unknown.
Plantago coronopus	cutleaf plantain	4Eval No List		U	C	B	1.7	·CW ·GV ·NW ·SN ·SW	Impacts unknown. Common on north coast
Plantago lanceolata	buckhorn plantain, English plantain	3Limited		C	C	B	2.1	·CA-FP	Many habitats. Turf weed primarily. Low density and impact in wildlands.
Poa pratensis	Kentucky bluegrass	3Limited		C	B	B	2.7	·All CA	Grasslands scrub, riparian areas. Widespread turf plant. Abiotic impacts unknown.
Polygonum cuspidatum	Japanese knotweed	2Moderate	Alert	B	B	D	2.7	·CaR ·CW ·GV ·NW ·SN	Riparian areas, wetlands, forest edges. More severe impacts in NW wetlands. Distribution limited in CA.
Polygonum sachalinense	Sakhalin knotweed	2Moderate	Alert	B	B	D	2.5	·CaR ·CW ·GV ·NW ·SN	Riparian areas. More severe impacts in NW wetlands. Distribution limited in CA.
Polypogon monspeliensis and subspp.	rabbitfoot polypogon, annual beardgrass	3Limited		C	C	B	2.3	·All CA	Margins of ponds and streams, seasonally wet places, edge of coastal dunes. Widespread. Impacts appear to be minor.
Potamogeton crispus	curlyleaf pondweed	2Moderate		B	B	B	3.2	·CW ·GV ·NW ·SW ·DMoj	Freshwater aquatic systems. Can be very invasive locally.
Raphanus sativus	radish	3Limited		C	C	B	2.5	·CA-FP	Present at low levels in numerous habitats. Widespread in disturbed sites.
Ricinus communis	castorbean	3Limited		C	B	B	2.5	·CaR ·CW ·GV ·SN ·SW ·DMoj	Coastal scrub and prairie, riparian areas. Widespread in southern CA. Impacts locally variable.
Robinia pseudoacacia	black locust	3Limited		C	B	B	2.8	·CA-FP ·GB	Riparian areas, canyons. Severe impacts in southern states. Impacts minor in CA.
Rubus armeniacus	Himalaya blackberry	1High		A	A	A	3.0	·CA-FP	Riparian areas, marshes, oak woodlands
Rumex acetosella	red sorrel, sheep sorrel	2Moderate		B	B	A	2.3	·CA-FP	Many habitats, riparian areas, forest, wetlands. Widespread. Abiotic impacts unknown. Impacts can vary locally.
Rumex crispus	curly dock	3Limited		C	C	A	2.7	·All CA	Grasslands, vernal pool, meadows, riparian. Widespread. Impacts appear to be minor.
Saccharum ravennae	ravennagrass	2Moderate	Alert	B	A	C		·GV ·DSon	riparian scrub, marsh and swamp
Salsola tragus	Russian-thistle	3Limited		C	B	B	2.8	·All CA	Desert dunes and scrub, alkali playa. Widespread. Impacts minor in wildlands.
Sapium sebiferum	Chinese tallowtree	2Moderate	Alert	B	B	C	3.2	·CW ·GV ·NW	Riparian areas. Impacts severe in southeast US. Limited distribution in California, but spreading rapidly regionally.
Saponaria officinalis	bouncingbet	3Limited		C	B	C	2.5	·CW ·GV ·NW ·SW ·GB	Riparian scrub and woodland. Impacts unknown or minor, but appear to be locally variable.
Schinus molle	Peruvian peppertree	3Limited		C	B	B	2.5	·CW ·GV ·SN ·SW	Riparian. Limited distribution. Impacts largely unknown in CA.
Schismus arabicus, Schismus barbatus	mediterraneangrass	3Limited		B	C	A	2.3	·CW ·GV ·SW ·D	Scrub, thorn woodland. Widespread in deserts. Impacts can be more important locally.
Senecio jacobaea	tansy ragwort	3Limited		C	B	B	2.8	·CA-FP	Grasslands, riparian. Impacts generally minor. Can be locally important in NW CA.
Sesbania punicea	red sesbania, scarlet wisteria	1High	Alert	A	B	C	3.2	·CA-FP ·DSon	Riparian areas
Silybum marianum	blessed milkthistle	3Limited		C	C	A	3.5	·CA-FP	Grasslands, riparian. Widespread, primarily in disturbed areas Impacts can be higher locally
Sinapis arvensis	wild mustard, charlock	3Limited		C	C	C	2.9	·CA-FP	Grasslands. Primarily in disturbed sites. Impacts minor or unknown in wildlands.
Sisymbrium irio	London rocket	2Moderate		B	B	A	1.9	·GV ·SW	Scrub, grasslands. Widespread. Primarily in disturbed sites. Impacts vary locally.
Solanum elaeagnifolium	silverleaf nightshade	4Eval No List		D	B	C	2.8	·CA-FP ·D	Primarily agricultural weed, but escaping to wildlands in other countries. May prove to be more important in future.
Sonchus asper	spiny sowthistle	4Eval No List		D	B	B	3.1	·All CA	Primarily an agricultural weed
Spartium junceum	Spanish broom	1High		A	B	B	3.2	·CA-FP ·DMoj	Coastal scrub, grasslands, wetlands, oak woodland, forests
Taeniatherum caput-medusae	medusahead	1High		A	A	A	3.4	·CA-FP ·MP	Grasslands, scrub, woodland
Tamarix aphylla	athel tamarisk	3Limited		C	B	B	3.5	·GV ·SW ·D	Desert washes, riparian areas. Limited distribution. Impacts minor, but can be locally higher.
Tamarix parviflora	smallflower tamarisk	1High		A	A	B	3.1	·CaR ·CW ·GV ·SN ·SW ·SNE ·DMoj	Riparian areas, desert washes, coastal scrub
Tamarix ramosissima	saltcedar, tamarisk	1High		A	A	A	3.3	·CW ·GV ·NW ·SN ·SW ·SNE ·D	Desert washes, riparian areas, seeps and springs
Taraxacum officinale	common dandelion	4Eval No List		D	B	B	2.8	·CA-FP ·GB	Primarily a turf weed in CA
Torilis arvensis	hedgeparsley	2Moderate		C	B	B	2.3	·CA-FP	Expanding range. Appear to have only moderate ecological impacts.
Tragopogon dubius	yellow salsify	4Eval No List		D	C	B	3.2	·CW ·GV ·SN ·SW	Generally a minor component of disturbed areas.
Trifolium hirtum	rose clover	2Moderate		C	B	B	2.8	·CA-FP	Grasslands, oak woodland. Widely planted in CA. Impacts relatively minor in most areas.
Ulmus pumila	Siberian elm	4Eval No List		D	B	B	2.5	·GV ·SN ·DMoj	Impacts unknown
Verbena bonariensis, Verbena litoralis	tall vervain, seashore vervain	4Eval No List		D	B	C	2.1	·CaR ·GV ·NW	Often in disturbed areas of irrigation canals
Vicia villosa	hairy vetch	4Eval No List		D	C	B	2.8	·CA-FP	Primarily an agricultural weed, Widespread but impacts minor in wildlands.
Vinca major	big periwinkle	2Moderate		B	B	B	2.8	·CA-FP ·DMoj	Riparian, oak woodlands, coastal scrub. Distribution currently limited but spreading in riparian areas. Impacts can be higher locally.
Vulpia bromoides	squirreltail fescue	4Eval No List		D	C	B	2.9	·CA-FP	Less common than V. myuros
Vulpia myuros	rattail fescue	2Moderate		B	B	A	3.0	·CA-FP ·D	Coastal sage scrub, chaparral. Widespread. Rarely forms monotypic stands, but locally problematic

Nomenclature:

Scientific names are based on The Jepson Manual.
For each species, the first common name is based on the Weed Science Society of America's "Composite List of Weeds", followed by other names used in California.

Citation:

Cal-IPC. 2006. California Invasive Plant Inventory. Cal-IPC Publication 2006-02. California Invasive Plant Council: Berkeley, CA.