Taprooted, acaulescent, tufted, herbaceous perennial; leaves 1 or more times pinnately compound, ovate or broadly ovoid in outline, 2-6 cm wide, 4-8 cm long, glabrous or minutely scabrous on margins, petioles 1-10 cm long, leaflets sessile, filiform to narrowly linear, ascending, 0.5-7 cm long, often opposite on rachis; inflorescences 1-5(-11+) per plant, peduncles (4-)7-40 cm long, glabrous except sparsely to moderately puberulent at apex with minute peg-like hairs appearing glandular, each peduncle terminated by a convex to globose congested umbel, 2-3.5 cm wide, involucre absent, rays 6-24, 3-8 mm long, lengthening slightly in fruit, umbellets of 4-13 flowers, involucel of 5-7 linear, entire bractlets, 1-3 mm long,
pedicels 1-1.5 mm long, to 3 mm long in fruit; flowers yellow, fading to pale yellow or white, sepals 0.2-0.4 mm long, petals 1-1.2 mm long; fruits tan, terete to somewhat dorsally compressed, broadly ovoid to oblong, not constricted at commissure, 4.8-5.2 mm long, 2.7-2.8 mm wide on commissure, dorsal wings straight, smooth, prominently corky, edges acute to rounded, wedge-shaped to truncate-ovate in cross section, 0.5 mm wide at base, 0.6-0.8 mm tall, the lateral ones often the tallest; mericarps with commissure planar to curved adaxially from the two ends, often with central groove or even cupulate due to enlargement of wings, oil tubes 1 per interval, 2 on commissure, forming ribbons about 0.3 mm wide. Flowers late April to late May; fruits mid May to early July.