Salmonflower Biscuitroot

Lomatium salmoniflorum (Coult. & Rose) Math. & Const Bull. Torrey Club 69: 246. 1942.
Peucedanum salmoniflorum Coult. & Rose; Holz. Contr. U. S. Nat. Herb. 3: 228. 1895. Leptotaenia salmonifiora Coult. & Rose, Contr. U. S. Nat. Herb. 7: 201. 1900.
Plants caulescent, 2-5 dm. high, from a stout thickened root, glabrous; leaves deltoid in general outline, excluding the petioles 1-3.5 dm. long, ternate, then 2-4-pinnate, the ultimate divisions filiform to linear, 1-7 mm. long, 0.5-1 mm. broad; petioles 5-15 cm. long, sheathing at the base; cauline leaves few, like the basal, short-petiolate with dilated sheaths; peduncles exceeding the leaves; involucel of a few filiform bractlets, shorter than the flowers, or wanting; rays 4—13, spreading, 1-6 cm. long, subequal; pedicels 2-14 mm. long, the umbellets 10-20flowered; flowers salmon-yellow; fruit oblong-oval, 10-14 mm. long, 5-6 mm. broad, glabrous, the wings much narrower than and homochromous with the body, slightly corky-thickened; oil-tubes solitary in the intervals, 2 on the commissure.
Type locality: "On basaltic rocks near upper ferry, Clearwater River above Lewiston, Nez Perce County," Idaho, Sandberg 24.
Distribution: Drainage svstem of the Snake River in northwestern Idaho and adjacent Washington and Oregon (Heller & Heller 3060, Piper 2781, 2782).