Geranium robertianum

Robert geranium

Family: Geraniaceae · Type: annual · Not Native

Robert geranium is a naturalized annual plant found in northern coastal, central coastal, and San Francisco Bay Area regions in open to shaded sites at elevations below 500 meters. Flowering throughout the year, this plant produces delicate pink to red-purple flowers 10.5 to 12.5 millimeters long with rounded petals. Growing with decumbent to ascending stems 10 to 50 centimeters tall and 1 to 3 millimeters wide, it has sparse hairs along the stem. Its distinctive leaves are deeply divided into 5 segments, each pinnately lobed with the middle segment having 16 to 37 lobes in the upper half. The fruit is characterized by a long 17 to 19 millimeter beak with a narrow 4 to 5 millimeter tip.

Habitat: Open to shaded sites

Bloom period: All year

Elevation: < 500 m

Bioregions: NCo, CCo, SnFrB

California counties: Mariposa, Alameda, Los Angeles, Riverside, Calaveras, Sonoma, Santa Cruz, Amador, Marin, Solano, Monterey, San Francisco, Santa Clara, Contra Costa, Del Norte, Napa, San Mateo, San Luis Obispo

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Jepson eFlora, Cal-IPC, and more.