Perideridia bolanderi
Bolander's yampah
(c) Matt Lavin, some rights reserved (CC BY) · licence
Family: Apiaceae · Type: Herb · Native
Perideridia bolanderi (Bolander's yampah) is a native California herb in the Apiaceae family, recognized by thread-like to oblong leaf segments.
Bolander's yampah is a California native perennial herb found in open grasslands and meadows at elevations of 300 to 1,500 meters. Flowering from June to August, this plant produces small white flowers in delicate compound umbels with 9 to 23 rays. Growing 15 to 90 centimeters tall with distinctive tuberous roots clustered in groups of two or three, it develops finely dissected basal leaves with thread-like segments. Its leaves are characteristically complex, with basal blades 10 to 20 centimeters long that are ovate and intricately divided into thread-like or oblong segments up to 6 centimeters long. The fruit is small, approximately 4 to 6 millimeters long with slender thread-like ribs.
Identification and appearance
Key characters: Geographically isolated; thread-like to oblong leaf segments
Habitat and range
California counties: Lassen, Mariposa, Tuolumne, Nevada, Placer, Plumas, Fresno, Shasta, Alpine, Mono, Sierra, Trinity, Madera, Tulare, Modoc, Butte, Siskiyou, Inyo
How to tell it apart
vs Ligusticum: Perideridia grows from tubers in grasslands; Ligusticum grows from taproots in mountain forests.; vs Daucus: Perideridia fruits are rounded with thin ribs; Daucus fruits are bristly and form a bird's-nest cluster.; vs Eriogonum: Eriogonum is in the buckwheat family with papery flowers; Perideridia has carrot-family umbels.; vs Angelica: Perideridia has small rounded fruits; Angelica has large flattened fruits with broad wings.; vs Achillea: Achillea is in the sunflower family with flat-topped flower heads; Perideridia has carrot-family umbels.
Frequently asked questions
Is Perideridia bolanderi native to California?
Yes. Perideridia bolanderi is native to California (recorded as native).
Where in California does Perideridia bolanderi grow?
Perideridia bolanderi occurs in Lassen, Mariposa, Tuolumne, Nevada, Placer, Plumas, Fresno, Shasta and other counties.
What plant family does Perideridia bolanderi belong to?
Perideridia bolanderi is in the Apiaceae family, genus Perideridia.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · Index of California Plant Names · CalPhotos
Last updated 2026-10-07
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.