Eriogonum truncatum

Mount diablo buckwheat, Mount Diablo Buckwheat

Family: Polygonaceae · Type: annual · Native

Conservation status: CNPS 1B.1

Mount diablo buckwheat is a rare (CNPS 1B.1) California native annual found in the northern eastern San Francisco Bay and Sacramento Valley regions, specifically around Mount Diablo in Contra Costa County, growing in sandy habitats at elevations of 200 to 400 meters. Flowering from April to August, this plant produces delicate white to rose-colored flowers in small clustered inflorescences. Growing to 10 to 45 centimeters tall with tomentose (woolly) stems, it develops distinctive basal and cauline leaves 1 to 5 centimeters long with soft, hairy surfaces. Its leaves are relatively broad, measuring 1 to 2 centimeters wide, with a soft tomentose texture especially on the undersides. The small fruit, approximately 1.7 to 2 millimeters long, has a smooth tip and completes the plant's compact, intricate structure.

Habitat: Sand

Bloom period: Apr-Aug

Elevation: 200-400 m

Bioregions: ScV (extirpated near Suisun, Solano Co.), ne SnFrB (Mount Diablo, Contra Costa Co. extirpated Alameda Co.).

California counties: Contra Costa, Alameda

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