This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Perennial, acaulescent herbs, with stout rootstocks, pinnately compound leaves and yellow flowers in compound cymes. Involucre mostly wanting. Involucels of a few narrow bracts. Calyx-teeth evident. Fruit oblong, strongly flattened dorsally, the carpels with sharp prominent dorsal and intermediate ribs, the lateral ribs broader and winged; oil-tubes usually 3-5 in the intervals and several on the commissural side. Stylopodium flat, evident. Seed-face flat. [Greek, dog-parsley.]
Six known species of the western United States, the following typical.
1876. Peucedanum graveolens S. Wats. Bot. King's Exp.
128. 1871. Peucedanum Kingii S. Wats. Proc. Am. Acad. 22:
474. 1887. Cynomarathrum Nuttallii Coult. & Rose, Contr. Nat.
Herb. 7: 245. 1960.
Glabrous, scape striate, 6-20' high, as long as the leaves or somewhat longer. Leaves all basal, long-petioled, pinnately or 2-pinnately divided into narrowly linear segments 1/2" wide or less; umbel unequally 4-20-rayed; rays 1/2'-1 1/2' long; involucels of several lanceolate at first partly united bracts; calyx-teeth short; fruit oblong, glabrous, 4"-6" long, nearly 2" wide, the carpels with narrow lateral wings, the dorsal and intermediate ribs also somewhat winged; oil-tubes 3-6 in the intervals, and 6-10 on the commissural side.
In dry, often rocky soil, western Nebraska, Wyoming and Utah. June-Aug.