Perideridia leptocarpa
Narrow-seeded yampah
Family: Apiaceae · Type: Herb · Native
Conservation status: CNPS 4.3
Perideridia leptocarpa (Narrow-seeded yampah) is a native California herb in the Apiaceae family, recognized by linear to club-shaped fruits diagnostic.
Narrow-seeded yampah is a California native perennial found in the Klamath Ranges in serpentine woodland outcrops at elevations of 600 to 1,500 meters. Flowering from June to August, this plant produces white flowers in delicate umbels with 12 to 18 unequal rays. Growing 45 to 75 centimeters tall with tuberous roots clustered in groups of two or three, it has a distinctive multi-layered leaf structure. Its basal leaves are lance-ovate and 2-pinnate, featuring narrow linear leaflets one to five centimeters long that are entire and sharply pointed. The fruit is a linear to club-shaped structure five to seven millimeters long with thread-like ribs.
Identification and appearance
Key characters: 9 sympatric species; linear to club-shaped fruits diagnostic
Habitat and range
Habitat: Serpentine outcrops in woodland
Elevation: 600-1500 m
California counties: Siskiyou, Trinity
Bloom period
Perideridia leptocarpa blooms Jun-Aug.
Conservation status
CNPS 4.3
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 leptocarpa native to California?
Yes. Perideridia leptocarpa is native to California (recorded as native).
When does Perideridia leptocarpa bloom?
Perideridia leptocarpa blooms Jun-Aug.
Where in California does Perideridia leptocarpa grow?
Perideridia leptocarpa occurs in Siskiyou, Trinity, at elevations of 600-1500 m.
What plant family does Perideridia leptocarpa belong to?
Perideridia leptocarpa is in the Apiaceae family, genus Perideridia.
Is Perideridia leptocarpa rare or endangered?
Perideridia leptocarpa carries California Rare Plant Rank 4.3, state rank S3.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · CNPS Rare Plant Inventory · Index of California Plant Names · CalPhotos · CDFW CNDDB
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.