Uinta Basin Springparsley

Cymopterus duchesnensis M. EJones, Contr W. Bot. 13: 12. 1910.
Aulospermum duchesnense Tidestrom, Contr. U. S. Nat. Herb. 25: 397. 1925.
Plants acaulescent or subcaulescent with the development of an inconspicuous pseudoscape, 10-25 cm. high, glabrous; leaves broadly ovate-oblong in general outline, excluding the petioles 3-9 cm. long, 3-6.5 cm. broad, pinnate or occasionally ternate, the leaflets membranaceous, pallid, glaucescent, cuneate to obovate, 15-40 mm. long, 10-45 mm. broad, ternately or quinately lobed and deeply dentate at the apex, the teeth lanceolate to ovate, acute, mucronate, 4-8 mm. long, 2-5 mm. broad, distinct to confluent; petioles 3-10 cm. long; peduncles exceeding the leaves, 5-20 cm. long; involucre wanting; involucel of several conspicuous, distinct, linear bractlets, usually exceeding the flowers; fertile rays 6-10, spreading, 15-35 mm. long; pedicels 2-A mm. long; flowers yellow; fruit ovoid-oblong, 8-10 mm. long, 5-8 mm. broad, the wings narrow at the base, about twice as wide as the body; oil-tubes 3-7 in the intervals, 5-6 on the commissure; seed-face slightly concave.
Type locality: "Among loose rocks on southern slopes of mesas," Myton, Utah, 5000 feet, M. E. Jones.
Distribution: Uinta Basin. Utah (Graham 7637, 7732, 8872).