Vesper multinervatus (J. M. Coult. & Rose) R. L. Hartm. & G. L. Nesom

Cymopterus multinervatus (Coult. & Rose) Tidestrom,
Proc. Biol. Soc. Wash. 48: 41. 1935.
Cymopterus purpurascens M. E. Jones, Proc. Calif. Acad. II. 5: 687. 1895. Not C. purpurascens
M. E. Jones, 1893. Phellopterus multinervatus Coult. & Rose, Contr. U. S. Nat. Herb. 7: 169. 1900.
Plants acaulescent or subcaulescent with the development of a pseudoscape, 4-20 cm. high, from long, slender or subfusiform tap-roots; leaves ovate-oblong in general outline, excluding the petioles 1-8.5 cm. long, 0.5-6 cm. broad, pinnate, bipinnate, or occasionally ternate-pinnate, somewhat fleshy, pallid, the leaflets entire to pinnately lobed, the lobes acute or obtuse, mucronulate, 0.5-6 mm. long, 0.5-2 mm. broad, usually confluent, glabrate; petioles 2-7 cm. long; peduncles equaling or exceeding the leaves, 2-14 cm. long, glabrous; involucre a low scarious sheath or of 1 or 2 conspicuous, nerved bracts, or a conspicuous, purplish, connate cup with irregular many-nerved lobes; involucel of conspicuous, ovate to ovate-oblong, subconnate, many-nerved, greenish or purple bractlets, usually with a whitish margin, about equaling the flowers; umbels compact, the fertile rays usually 1-5, 5-25 mm. long, glabrous, the inner rays shorter and the umbellets usually sterile, the secondary rays short; pedicels less than 1 mm. long; flowers purplish; fruit ovoid to ovoid-oblong, 8-17 mm. long, 8-17 mm. broad, frequently purplish-tinged, the wings long and slender, slightly enlarged at the base, twice to thrice as broad as the body; oil-tubes 3-9 in the intervals, 5-12 on the commissure, accessory tubes occasionally present in the wings; strengthening cells present or absent in the wing-base.
Type locality: Peach Springs. Arizona, Lemmon & Lemmon.
Distribution: Southern Utah and New Mexico to Texas, northern Mexico, southern Nevada, and southeastern California (Eastwood S1S8, Jones 5002, Metcalfe 3).

Vesper multinervatus, synonym Cymopterus multinervatus, is a species of flowering plant in the carrot family Apiaceae, known by the common name purplenerve springparsley. It is a perennial herb native to the southwestern United States, including the desert regions. It is stemless, producing leaves and inflorescence at ground level from a taproot. The leaves are erect on petioles of a few centimeters in length, with a fleshy blade dissected into waxy multilobed leaflets. The inflorescence arises on a stout purple or greenish peduncle up to about 14 centimeters tall. At the top is a rounded cluster of purple flowers sheathed in purple-veined bracts.