Stems erect, 15–70 cm. Herbage glabrous. Leaves bipinnate; leaflets lanceolate, finely serrate, 2–8 cm long. Umbel solitary; rays 1–3 cm long, subequal; involucral bracts leafy, deeply toothed; involucel bracts smaller, few-toothed. Flowers yellow; petals ca. 1 mm long. Mericarps glabrous, broadly elliptic, 5–7 mm long; ribs winged, the lateral slightly wider than the dorsal (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).