Ambrosia trifida (giant ragweed) is an annual herb (family Asteraceae) with a long cluster of green-yellow flowers and opposite leaves found in the central western and southwestern areas of California. Giant ragweed has both female and male flower parts. It is native to the central and eastern United States. It favors grasslands. It spreads via […]

Araujia sericifera (bladderflower) is a perennial vine (family Asclepiadaceae) with white to pale pink flowers and triangular leaves found in the central and south coast ranges and transverse ranges of California. It is native to South America. It grows in woodlands, grasslands, and scrub and chaparral habitat. Its seed pods spread predominantly via wind, but […]

Berberis darwinii (Darwin barberry) is a shrub (family Berberidaceae ) with yellow-orange flowers and small spiny leaves found in the central and north coast ranges of California. It is native to southern South America. It favors forest and woodland habitats. It spreads via birds and other animals that eat the fruit, and may also be dispersed […]

Berteroa incana (hoary Alyssum) is a hairy herb (family Brassicaceae) with a cluster of white flowers and grayish leaves found in the Central Valley, Modoc Plateau area and desert ranges of California. It is native to Eurasia. It favors grasslands and wetlands. It spreads via seeds and possibly suckers, and vegetatively re-sprouts from its base.

Buddleja davidii (butterfly bush) is a shrub (family Buddlejaceae) with a cluster of pink to purple flowers and narrow leaves found in the San Francisco Bay area and coastal ranges of California, and is invasive in the Pacific Northwest. It is native to China. It favors riparian and bottomland habitat. It is highly regenerative and […]

Carex pendula (hanging sedge) is a sedge (family Cyperaceae) that can grow to be more than 6 feet tall and is found in the San Francisco Bay area and Sacramento Valley in California. It has red-brown to purple tips. It is native to Europe. It spreads via rhizomes and seeds. One plant can produce 20,000 […]

Casuarina equisetifolia (beach sheoak) is an evergreen tree (family Casuarinaceae) with tiny red flowers and needle-like leaves found in the Sacramento Valley, San Francisco Bay area, south coast ranges and desert ranges of California. It has both female and male flower parts. It is native to northern Australia and Southeast Asia. It occurs in dunes. It […]

Catharanthus roseus (Madagascar periwinkle) is a herb/ (family Apocynaceae) with pink flowers and oval shaped leaves found in the south coast and desert ranges of California. It is native to Madagascar. It favors dunes, grasslands, and scrub and chaparral habitat. It spreads via seeds and is easily cultivated. Seeds are dispersed by ants, water, wind […]

Cenchrus echinatus (southern sandbur) is an annual grass (family Poaceae) that can grow up to 30 inches tall and is found in the San Francisco Bay area and the south coast and desert ranges of California. It is native to the southern United States, Mexico, Central America and South America. It favors grasslands and dunes. […]

Cenchrus longispinus (mat sandbur) is an annual grass (family Poaceae) that can grow up to 2 feet tall and is found in the Central Valley, Modoc Plateau area, and the south coast and desert ranges of California. It is native to the central and eastern United States. It favors grasslands and dunes. It reproduces by […]