Perideridia oregana

Oregon yampah

Family: Apiaceae · Type: perennial · Native

Oregon yampah is a California native perennial found in the Klamath Ranges, northern Coast Ranges, California High Cascade Range, San Francisco Bay Area, and southern Coast Ranges in pine and oak woodland at elevations of 60 to 2,100 meters. Flowering from July to August, this plant produces white flowers in delicate umbels with 10 to 29 small blossoms. Growing 1 to 9 decimeters tall with green to bluish-green stems, it develops distinctive tuberous roots clustered in groups of two to six. Its complex basal leaves are broadly ovate, divided into intricate ternate-pinnate sections with linear or oblong leaflets 0.5 to 6 centimeters long. The plant produces small oblong fruits 3 to 6 millimeters long with delicate thread-like ribs.

Habitat: Open flats or slopes, pine/oak woodland

Bloom period: Jul-Aug

Elevation: 60-2100 m

Bioregions: KR, NCoR, CaRH, SnFrB, SCoRI, MP

California counties: Del Norte, Modoc, Monterey, San Diego, Siskiyou, Trinity, Sonoma, Lassen, Butte, Glenn, Mendocino, Tehama, Napa, San Luis Obispo, San Benito, Humboldt, Contra Costa, Alameda, Lake, Colusa, Shasta, Santa Clara, Los Angeles, Fresno

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