Alpine Oreoxis

Oreoxis alpina (A. Gray) Coult. & Rose, Contr U. S. Nat. Herb. 7: 144. 1900.
Cymopterus alpinus A. Gray, Am. Jour. Sci. II. 33: 408. 1862.
Plants 1-17 cm. high, puberulent; leaves oblong in general outline, excluding the petioles 5-50 mm. long, 3-15 mm. broad, 1-2-pinnate, the ultimate divisions mostly distinct, 2-30 mm. long, 1-2 mm. broad; petioles 1-7 cm. long; peduncles 0.5-15 cm. long; involucre occasionally of an inconspicuous linear bract; involucel dimidiate, the bractlets linear, 2-5 mm. long, usually ciliate; rays 3-6, 2-7 mm. long; flowers yellow; fruit oblong, boat-shaped, 3-6 mm. long, 2-4 mm. broad, glabrous when mature but pubescent when young, the wings obovate, narrowed at the base, acuminate to obtuse at the apex in cross section; oil-tubes usually solitary in the intervals, 2-4 on the commissure.
Type locality: "From the head-waters of Clear Creek, and the alpine ridges lying east of •Middle Park,'" Colorado, Parry 158.
Distribution: Mountains, Wyoming and central Colorado to northern New Mexico and eastern Utah to northeastern Arizona (Baker 847, Hall if Harbour 213).