Geranium dissectum (cutleaf Geranium) is an annual or biennial forb/herb (family Geraniaceae) found throughout California along waste ground, grasslands, and hedge banks. It can compete with native vegetation for resources.

Crocosmia x crocosmiiflora (crocosmia or montbretia) is a perennial (family Iridaceae) found along the coast of California and in the San Francsico Bay region. Crocosmia is a commonly cultivated ornamental plant, and is most commonly found near urban areas. It prefers disturbed areas, including roadsides, coastal scrub, prairie and forests. Crocosmia is a superior competitor […]

Crupina vulgaris (common Crupina, bearded creeper) is a winter annual forb (family Asteraceae) located in Sonoma and Modoc counties where they are found on grassy sites, rangelands, forested areas, and roadsides. Crupina vulgaris reduces forage for grazing animals. It is a bigger problem in other western states and its current distribution in California has been […]

Cupressus macrocarpa (Monterey cypress) Monterey cypress is native to the Monterey coast area, but is considered moderately invasive in other parts of California where it spreads from planted windbreaks or hedgerows into surrounding vegetation. Jepson Manual, 2nd Edition: Hesperocyparis macrocarpa

Cynara cardunculus (artichoke thistle) is a large perennial thistle (family Asteraceae) from the Mediterranean region found below 500 m elevations throughout California, except in the Great Basin and Desert Regions. Artichoke thistle prefers disturbed open sites, including grassland, chaparral, coastal scrub, and riparian areas. This thistle is closely related to cultivated artichokes (Cynara scolymus), and […]

Cynodon dactylon (Bermuda grass) is a low-statured, creeping, warm season perennial grass (family Poaceae) that is commonly planted in garden lawns and as turf. It is native to East Africa but has become a cosmopolitan weed in warmer regions around the world, where it tolerates a broad range of soil types and moister levels. Bermuda […]

Dipsacus sativus (Fuller’s teasel) is a biennial (family Dipsacaceae) found in California’s Coastal and Peninsular Ranges and the San Francisco Bay area. It favors disturbed sites, including grasslands, roadsides, ditches and riparian sites. Fuller’s teasel’s spiny flower heads were used for carding wool before metal carding combs were created. Teasel plants may grow to form […]

Dittrichia graveolens (stinkwort) is a fall-flowering, sticky aromatic annual (family Asteraceae) that is native to southern Europe, northern Africa, and southwestern Asia.  It was first recorded in California in 1984 and has rapidly spread across many parts of the state since its introduction. Stinkwort has glandular-haired leaves and stems and grows to a height of […]

Echium candicans (pride-of-Madeira) is a shrub (family Boraginaceae) found along the central and south coast of California, and in the San Francisco Bay region. This native to Madeira and the Canary Islands inhabits open coastal bluffs and hillsides. Pride-of-Madeira is a common landscape ornamental requiring a summer source of moisture in inland areas, but can […]

Egeria densa (Brazilian Egeria) is a common aquatic perennial (family Hydrocharitaceae) that occurs in lakes, springs, ponds, and streams. Its underwater growth significantly retards water flow and decreases the abundance and diversity of native plant seeds in lake bottoms. It was introduced as a freshwater aquarium plant.