Lomatium dissectum, giant lomatium

l dissectum
Photo by Richard Mcneill

Intermountain Flora
Robust perennial from an often very large, woody taproot that may be surmounted by a branching caudex, mostly 5-15 (20) dm tall at maturity; stems several, stout, glabrous, usually ascending rather than strictly erect; leaves large, basal and cauline, the lower ones the largest, all generally more or less scaberulous, seldom glabrous, ternate-pinnately dissected into small and often narrow ultimate segments up to about 1 (2) cm long; rays of the umbel mostly 10-30, equal or unequal, well developed at anthesis, so that the umbellets are clearly distinct, at least the longer rays mostly 4-10 cm long at maturity; involucel of well developed narrow bractlets; flowers yellow or sometimes purple, always some of them sterile, the fruiting pedicels in our vars. well developed, mostly 4-20 mm long; fruit elliptic, 8-17 mm long and 4.5-10 mm wide, the wings narrow (up to about 1 mm wide) and more or less corky-thickened, the dorsal ribs inconspicuous, the oil-tubes obscure; 2n = 22.

Cronquist, A., Holmgren, J.L., and Holmgren, P.K. (1997) "Intermountain Flora" pg. 398, vol. 3 part A, The New York Botanical Garden New York.