Perideridia bolanderi (A. Gray) A. Nels. & J. F. Macbr.

Perideridia bolanderi (A. Gray) Nelson & Macbr Bot. Gaz. 61: 33. 1916.
Podosciadium Bolanderi A. Grav. Proc. Am. Acad. 7: 346. 1868. Eulophus Bolanderi Coult. & Rose. Rev. N. Am. Umbell. 112. 1888. Conopodium Bolanderi K.-Pol. Bull. Soc. Nat. Mosc. II. 29: 205. 1916. Eulophus Bolanderi var. benignus Jepson. Madrono 1: 130. 1923. Eulophus euspidatns Jepson, Madrono 1: 133. 1923.
Slender, from a fascicle of fusiform tubers, 2.5-S dm. high; leaves deltoid in general outline, excluding the petioles 5-15 em. long, ternate-pinnately dissected, the ultimate divisions oblong to filiform, 5-30 mm. long, the terminal often elongate, 5-8 cm. long, the lateral usually lobed and toothed, the petioles and rachises somewhat inflated; petioles 2-8 cm. long; peduncles slender, 6-14 cm. long; involucre of 1-several narrowly lanceolate to linear, searious bracts, 5-12 mm. long; involucel of several narrowly lanceolate to obovate, acuminate, searious bractlets, 3-6 mm. long, shorter or longer than the flowers and fruit; rays 10-20, 1-2.5 cm. long; pedicels 3-6 mm. long; styles slender, recurved, 1-2 mm. long; stylopodium low; fruit oblong, 3-5 mm. long, 2-2.5 mm. broad; oil-tubes 2-5 in the intervals, 6 on the commissure; seed flattened dorsally.
Type locality: Mariposa Trail. Yosemite, Sierra Nevada. California, Bolandcr. Distribution: Wvomiug and Idaho to northwestern Utah and eastern Oregon, south in the Sierra Nevada to central California (Baker 1360, Heller 11.572, Purpus 5293).

Perideridia bolanderi is a species of flowering plant in the family Apiaceae known by the common name Bolander's yampah. It is native to the western United States, where it grows in many types of habitat. It is a perennial herb which may approach one meter in maximum height, its slender, erect stem growing from tubers measuring up to 7 centimeters long. Leaves near the base of the plant have blades up to 20 centimeters long which are divided into many subdivided lobes of various sizes and shapes; the terminal segments are usually lined with teeth. Leaves higher on the plant are smaller and less divided. The inflorescence is a compound umbel of many spherical clusters of small white flowers. These yield ribbed, oblong-shaped fruits about half a centimeter long. The Atsugewi and Miwok of California used the tuberous roots of this plant for food.