Cymopterus longipes, long-stalk spring-parsley

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Intermountain Flora
Perennial with a long, thickened taproot and subterranean, simple or few-branched crown from which 1 or more stout pseudoscapes arise, these reaching the ground-level at anthesis, but usually continuing to elongate and becoming 5-20 cm long in fruit, often more or less sprawling at maturity, the herbage glaucous, glabrous or in var. ibapensis mostly several, 3-15 cm long (or to 25 cm in fruit); leaves clustered at the top of the pseudoscape, rather openly pinnately about twice or three times dissected, the primary pinnae all in nearly the same plane, 2 to several pairs, discrete and well separated on the leaf rachis, the secondary ones often more or less confluent and sometimes with a few lobes or teeth, the blade mostly 2-8 cm long overall, from evidently longer than wide to nearly as wide as long; inflorescence compact at anthesis but still evidently a compound umbel, a little looser in fruit, the rays becoming 0.8-4 cm long, the pedicels 3-8 mm long in fruit; involucre wanting, the involucel of several well developed, slender bractlets, tending to be dimidiate; carpophore well developed, bifid to the base, tending to persist after the mericarps have fallen; fruit 5-8 mm long, the lateral wings well developed, mostly 1-2 mm wide, the dorsal ones similar or often somewhat narrower, sometimes scarcely developed and the fruit suggesting that of a Lomatium, the oil-tubes readily visible through the pericarp, 3-7 in the intervals, 4-9 on the commissure.

Cronquist, A., Holmgren, N.H., and Holmgren, P.K. (1997) "Intermountain Flora" pg. 392, vol. 3 part A, The New York Botanical Garden New York.