Perideridia gairdneri subsp. borealis
(c) Matt Lavin, some rights reserved (CC BY-SA) · licence
Family: Apiaceae · Type: Herb · Native
Perideridia gairdneri subsp. borealis is a native California herb in the Apiaceae family, recognized by multi-veined petals diagnostic.
Northern gairdner's yampah is a California native perennial found in the Klamath Ranges, northern Coast Ranges, and Warner Mountains in moist meadows, flats, and streamside habitats at elevations below 3,000 meters. Flowering from June to August, this plant produces white flowers in umbels with generally 11 to 16 rays. Growing with a rigid stem and clustered tuberous roots less than 15 millimeters wide, it develops compact underground structures that support its growth. Its leaves are finely divided, typical of the carrot family, creating delicate, lacy foliage that complements its slender flowering structure. The plant's petals are distinctively marked with 5 or 7 prominent veins, adding subtle complexity to its simple white flowers.
Identification and appearance
Key characters: 9 sympatric species; multi-veined petals diagnostic
Habitat and range
Habitat: Generally moist soil of flats, meadows, streamsides
Elevation: < 3000 m
Outside California: to southwestern Canada, South Dakota
Bloom period
Perideridia gairdneri subsp. borealis blooms Jun-Aug.
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 gairdneri subsp. borealis native to California?
Yes. Perideridia gairdneri subsp. borealis is native to California (recorded as native).
When does Perideridia gairdneri subsp. borealis bloom?
Perideridia gairdneri subsp. borealis blooms Jun-Aug.
What plant family does Perideridia gairdneri subsp. borealis belong to?
Perideridia gairdneri subsp. borealis is in the Apiaceae family, genus Perideridia.
What habitat does Perideridia gairdneri subsp. borealis grow in?
Perideridia gairdneri subsp. borealis grows in Generally moist soil of flats, meadows, streamsides.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · 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.