Page author: Don Knoke
Perideridia bolanderi
Bolander's yampah
WTU specimens
Other herbaria

Distribution: Northeast Oregon and adjacent Idaho, south through eastern Oregon and western Idaho to Nevada and Utah.

Habitat: Dry, open, often rocky hillsides, ridges and dry washes in the foothills and high plains.

Flowers: July - August

Origin: Native

Conservation Status: Not of concern


Slender, glabrous perennial from a tuberous-thickened, edible, fascicled root, the stem solitary, 2-6 dm. tall.


Lower leaves well-developed and crowded, the petiole dilated, 2-8 cm. long, the blade 5-25 cm. long, ternate-pinnately dissected, with narrow, numerous ultimate segments, these distinctly dimorphic; upper leaves few and reduced, the petiole well-deeloped but the blade often reduced to a single, narrow segment.


Umbles 1-several, long-pedunculate, 1.5-5 cm. wide, the rays up to 3.5 cm. long; bractlets of the involucel well-developed, scarious, narrowly lanceolate to obovate, acuminate; calyx teeth well developed; flowers white.


Fruit oblong, 3-5 mm. long.

Accepted Name:
Perideridia bolanderi (A. Gray) A. Nelson & J.F. Macbr.

Synonyms & Misapplications:
Eulophus bolanderi
Podosciadium bolanderi
ssp. bolanderi – Bolander's yampah
Additional Resources:

PNW Herbaria: Specimen records of Perideridia bolanderi in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Perideridia bolanderi checklist entry.

E-Flora BC: Perideridia bolanderi atlas page.

CalPhotos: Perideridia bolanderi photos.

USDA Plants: Perideridia bolanderi information.

8 photographs:
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