Plants from an unbranched, tuberous or bulbous taproot. Herbage glabrous. Leaf blades obovate in outline, biternate or triternate; ultimate segments well-separated, linear 1–5 cm long, 2–5 mm wide, >5 times as long as wide; dilated petioles heavily veined. Umbels: peduncles ascending, 5–20 cm; rays unequal, 1–10 cm long; involucel absent. Flowers yellow. Mericarps lanceolate to narrowly elliptic, 5–8 mm long, glabrous; marginal wings up to 0.5 mm wide; oil tubes solitary in the intervals (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).