Parish's Yampah

Perideridia parishii (Coult. & Rose) Nelson & Macbr Bot. Gaz. 61: 33. 1916.
Cayutn Gairdneri var. latifolinm A. Gray, Proc. Am. Acad. 7: 344. 186S.
Pimpinella Parishii Coult. & Rose. Bot. Gaz. 12: 157. 1887.
Eulophus Parishii Coult. & Rose. Rev. N. Am. Umbell. 112. 1888.
Eulophus Pringlei var. simplex Coult. & Rose, Rev. N. Am. Umbell. 113. 1888.
Eulophus Parishii var. Rusbvi Coult. & Rose, Bot. Gaz. 14: 281. 1889.
Carum Lemmuni Coult. & Rose. Bot. Gaz. 14: 283. 1889.
Eulophus simplex Coult. & Rose. Contr. U. S. Nat. Herb. 7: 1 12. 1900.
Perideridia simplex Nelson & Macbr. Bot. Gaz. 61: 33. 1916.
( onopodium Parish, i K.-Pol. Bull. Soc. Nat. Mosc. II. 29: 205. 1916.
Conopodium simplex K.-Pol. Bull. Soc. Nat. Mosc. II. 29: 205. 1916.
Perideridia Pringlei var. simplex House. Bull. N. Y. State Mus. 233-234: 68. 1921.
Perideridia Rusbvi House. Bull. N. Y. State Mus. 233-234: 68. 1921.
Ataenia Lemmonii H. Wolff in Engler, Pflanzenreich 90 (ia ) : 172. 1927.
Eulophus Parishii var. typicus H. Wolff in Engler, Pflanzenreich 90 (4 :28 ) : 334. 1927.
Slender, from a solitary tuber or a fascicle of fusiform or ovoid tubers, 2-8 dm. high; leaves lanceolate to ovate in general outline, excluding the petioles 5-15 cm. long, ternate, or sometimes simple or biternate, the leaflets linear to lanceolate, 2-10 cm. long, the terminal often elongate and more or less distant; petioles 3-7 cm. long; peduncles slender, 6-15 cm. long; involucre wanting, or of an occasional minute bract; involucel of several linear to obovate, searious or colored bractlets, 2-4 mm. long, shorter than the flowers and fruit; rays S-I5, usually unequal, 1-4 cm. long; pedicels 3-8 mm. long; styles slender, recurved, 1-2 mm. long; stylopodium conic; fruit oblong to ovoid, 2.5-3.5 mm. long, 1.5-2.5 mm. broad; oil-tubes 2-4 in the intervals, 6 on the commissure.
Type locality: Damp meadows, Bear Valley, San Bernardino Mountains, California, Parish 9S7 (part).
Distribution: Nevada to California, south to Arizona and through the Sierra Nevada to southern California (Heller 11,649, Parish 3171).

Perideridia parishii is a species of flowering plant in the family Apiaceae known by the common name Parish's yampah. It is native to mountainous regions of the southwestern United States, where it grows in forests and other habitat. It is a perennial herb growing up to 90 centimeters tall, its slender green stem growing from a small tuber. Leaves near the base of the plant have blades 10 to 20 centimeters long divided into pairs of leaflets, which may be subdivided or lobed. The inflorescence is a compound umbel of many spherical clusters of small white flowers. These yield ribbed, round or oblong-shaped fruits each about half a centimeter long.