Plants subacaulescent to caulescent from a slender taproot. Herbage puberulent. Leaf blades lanceolate in outline, bi- to tripinnate, 3–8 cm long; ultimate segments crowded linear, 2–5 mm long. Umbel: peduncles 5–20 cm long; rays becoming unequal, 5–30 mm long; involucel bracts linear, 2–4 mm long, scarious-margined. Flowers white. Mericarps glabrous, elliptic to obovate, 6–9 mm long; marginal wings 0.5–1 mm wide; oil tubes 1 to 4 per interval (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).