Perideridia kelloggii
Kellogg's yampah
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Family: Apiaceae · Type: Herb · Native
Perideridia kelloggii (Kellogg's yampah) is a native California herb in the Apiaceae family, recognized by fibrous roots and reflexed bracts diagnostic.
Kellogg's yampah is a California native perennial found in northwestern California, the Cascade Range, central Sierra Nevada, central Coast Ranges, and San Francisco Bay Area in open grasslands and serpentine outcrops at elevations to 1,800 meters. Flowering from July to August, this plant produces white flowers in delicate umbels with 9 to 20 rays spreading in an ascending pattern. Growing 70 to 150 centimeters tall with fibrous roots clustered in groups of 5 to 15, it has distinctive finely divided leaves with multiple linear leaflets. Its basal leaves are broadly triangular, 1 to 2 times ternate-pinnate, with narrow leaflets 3 to 12 centimeters long and 2 to 8 millimeters wide. The fruit is a small elliptic-oblong structure 4 to 5 millimeters long with thread-like ribs.
Identification and appearance
Key characters: 11 sympatric species; fibrous roots and reflexed bracts diagnostic
Habitat and range
Habitat: Open grassland, serpentine outcrops
Elevation: < 1800 m
California counties: Mendocino, Lake, Sonoma, San Mateo, Alameda, Marin, San Benito, Monterey, Humboldt, Shasta, Trinity, Butte, Tuolumne, San Francisco, Santa Cruz, Modoc, Sierra, Yuba, Colusa, Solano, Contra Costa, Tehama, Sutter, Nevada, Lassen, Napa, Santa Clara, Calaveras, Fresno, Amador, San Diego, El Dorado, Glenn, Mariposa, San Joaquin, San Luis Obispo, Yolo, Sacramento
Bloom period
Perideridia kelloggii blooms Jul-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 kelloggii native to California?
Yes. Perideridia kelloggii is native to California (recorded as native).
When does Perideridia kelloggii bloom?
Perideridia kelloggii blooms Jul-Aug.
Where in California does Perideridia kelloggii grow?
Perideridia kelloggii occurs in Mendocino, Lake, Sonoma, San Mateo, Alameda, Marin, San Benito, Monterey and other counties, at elevations of < 1800 m.
What plant family does Perideridia kelloggii belong to?
Perideridia kelloggii is in the Apiaceae family, genus Perideridia.
What habitat does Perideridia kelloggii grow in?
Perideridia kelloggii grows in Open grassland, serpentine outcrops.
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.