Musineon divaricatum (Pursh) Nutt.

Musineon divaricatum (Pursh) Nutt. ; T. & G. Fl N. Am. 1: 642, in part. 1840.*
Seseli divaricatum Pursh, Fl. Am. Sept. 732. 1814.
Adorium crassifolium Raf. Bull. Bot. Seringe 217. 1830.
Musineon peduyiculatum A. Nelson, Bull. Torrey Club 28: 225. 1901.
Plants caulescent, spreading to erect, the stems glabrous to somewhat scabrous, usually dichotomously branching and longer than the leaves; leaves ovate-oblong in general outline, excluding the petioles 1.5-9 cm. long, 1-S cm. broad, 1-2-pinnate or ternate-pinnate, the leaflets oblong, pinnately lobed, 5-15 mm. long, 3-10 mm. broad; petioles 1-13 cm. long; bractlets 2-4 mm. long, linear-lanceolate, acute, more or less distinct, sometimes scarious-margined, scaberulous, shorter than the yellow flowers; rays 10-20, subequal, 4-45 mm. long, glabrous or scaberulous; pedicels 1-3 mm. long; fruit ovoid to oblong, constricted at the apex, 3-6 mm. long, about 2 mm. broad, glabrous or rarely minutely scaberulous, the oil-tubes 3-4 in the intervals, 4—6 on the commissure and sometimes one in each rib, the seed-face concave.
Type locality: "In Upper Louisiana," Missouri bluffs at the mouth of L'eau qui court (Niobrara River, South Dakota). Bradbury.
Distribution : Northern Montana to central Colorado, Missouri River valley of South Dakota and Nebraska, west to western Wyoming and Montana (Nelson 709 3, Oslerhout 2801).