A list of invasive plant species in California. Numerous plants have been introduced to the California Floristic Province and within the state's borders. Many of them have become invasive species and/or noxious weeds. The following are some of these species: List Acacia dealbata—silver wattle Acacia melanoxylon—blackwood acacia Acacia paradoxa—paradox acacia Agrostis avenacea—Pacific bentgrass Ailanthus altissima—tree-of-heaven Aira caryophyllea Allium neapolitanum—white garlic Alliaria petiolata Alternanthera philoxeroides—alligatorweed Alternanthera sessilis—sessile joyweed Ammophila arenaria Ammophila breviligulata Ampelodesmos Andropogon virginicus Arctotheca calendula—capeweed Artemisia biennis Anthoxanthum odoratum—sweet vernal grass Arundo donax—giant reed Asparagus aethiopicus Asparagus asparagoides—bridal creeper Atriplex lindleyi Atriplex rosea Atriplex semibaccata—Australian saltbush Atriplex suberecta Avena barbata—slender oat Avena fatua—wild oats Avena sterilis—animated oat Azolla pinnata Brachypodium distachyon—annual false-brome Brachypodium sylvaticum—slender false-brome Brassica nigra—black mustard Brassica rapa-field mustard Brassica tournefortii Briza maxima—rattlesnake grass Bromus alopecuros Bromus arenarius Bromus catharticus Bromus commutatus Bromus diandrus—ripgut brome Bromus hordeaceus—soft chess Bromus madritensis ssp. rubens—red brome Bromus secalinus Bromus sterilis Bromus tectorum—cheatgrass Broom (plant) Cardaria draba—whitetop Carduus acanthoides Carduus crispus Carduus nutans—musk thistle Carduus pycnocephalus—Italian thistle Carduus tenuiflorus—winged plumeless thistle Carpobrotus chilensis—sea-fig Carpobrotus edulis—iceplant Castor oil plant Caulerpa taxifolia Centaurea calcitrapa—purple starthistle Centaurea diffusa—diffuse knapweed Centaurea iberica—Iberian knapweed Centaurea solstitialis—yellow starthistle Centaurea sulphurea—sulphur knapweed Centaurea virgata—squarrose knapweed Chenopodiastrum murale Chenopodium vulvaria Chloris gayana Cirsium arvense—Canada thistle Cirsium ochrocentrum—yellowspine thistle Cirsium vulgare—bull thistle Cistus monspeliensis Conium Cordyline australis—New Zealand cabbage tree Cortaderia jubata—pampasgrass Cortaderia selloana—white pampasgrass Cotoneaster franchetii—Cotoneaster Cotoneaster lacteus—Parney's Cotoneaster Cotoneaster pannosus—silverleaf cotoneaster Crataegus monogyna—common hawthorn Crocosmia x crocosmiiflora—montbretia Cynara cardunculus—cardoon thistle Cynanchum louiseae Cynodon dactylon—Bermuda grass Cyperus rotundus Cytisus multiflorus Cytisus scoparius—Scotch broom Cytisus striatus—Portuguese broom Dactylis glomerata—orchard grass Dactyloctenium aegyptium Delairea odorata—Cape ivy, German ivy Digitalis purpurea—foxglove Diplotaxis muralis Diplotaxis tenuifolia Dittrichia graveolens Echium candicans—pride-of-Madeira Eichhornia crassipes—water hyacinth Elaeagnus angustifolia—Russian olive Equisetum—horsetail Equisetum hyemale—scouringrush horsetail Eragrostis cilianensis—candy grass Erica lusitanica—Spanish heath Erodium botrys—broadleaf filaree Erodium cicutarium—redstem filaree Erysimum repandum Eucalyptus camaldulensis—red gum Eucalyptus globulus—blue gum Euphorbia peplus Fallopia baldschuanica Fennel Festuca arundinacea—coarse fescue Festuca myuros—red-tailed fescue Ficus carica—edible fig Foeniculum vulgare—fennel Gazania linearis—gazania Genista canariensis—Canary Islands broom Genista linifolia—Mediterranean broom Genista monosperma—bridal veil broom Genista monspessulana—French broom Geranium dissectum—cutleaf geranium Geranium molle—covesfoot cranesbill Glyceria declinata—mannagrass Hedera canariensis—Algerian ivy Hedera helix—English ivy Hedypnois cretica Helichrysum petiolare—licorice plant Hirschfeldia incana—Mediterranean mustard Heteranthera limosa Holcus lanatus—velvet grass, Yorkshire fog Hordeum marinum—Mediterranean barley Hordeum murinum—hare barley Hyparrhenia hirta Hypericum canariense—Canary Island St. Johnswort Hypericum perforatum—St. John's Wort Ilex aquifolium—English holly Ipomoea cairica—Coast Morning Glory Ipomoea indica—blue morning glory Iris missouriensis—western blue flag