Vesper bulbosus (A. Nels.) R. L. Hartm. & G. L. Nesom

Cymopterus bulbosus A. Nelson, Bull. Torrey Club 26: 241. 1899
Cymopterus utahensis var. Eastwoodae M. E. Jones, Proc. Calif. Acad. II. 5: 685. 1895. Phellopterus bulbosus Coult. & Rose, Contr. U. S. Nat. Herb. 7: 168. 1900.
Phellopterus purpurascens var. Eastwoodae Coult. & Rose, Contr. U. S. Nat. Herb. 7: 169. 1900. Phellopterus camporum Rydb. Bull. Torrey Club 31: 574. 1904.
Plants acaulescent or subcaulescent with the development of a pseudoscape, 5-35 cm. high, from long, slender to clavate taproots, glabrous; leaves ovate-oblong in general outline, excluding the petioles 1-9 cm. long, 0.6-7 cm. broad, pinnate to bipinnate, pallid, somewhat fleshy, the leaflets entire to pinnately lobed, the lobes obtuse, linear, 1-10 mm. long, 1-5 mm. broad, confluent; petioles 1.5-9 cm. long; peduncles usually several and exceeding the leaves, 1.5-26 cm. long; involucre conspicuous, varying from a low sheath to conspicuous, connate, whitish, 1-3-nerved bracts; involucel similar to the involucre, equaling or exceeding the flowers; fertile rays 3-8, spreading, 5-50 mm. long, the secondary rays short; pedicels 3-12 mm. long; flowers purplish; fruit ovoid-oblong to oblong, 7-17 mm. long, 4-12 mm. broad, the wings narrow or slightly enlarged at the base, narrower to broader than the body, acute; oil-tubes 1-9 in the intervals, 3-10 on the commissure.
Type locality: Green River, Wyoming, A. Nelson 4709.
Distribution: Central Colorado and southwestern Wyoming to western Texas and central New Mexico (Baker 59, Payson if Payson 2579).