Acaulescent with a woody, branched caudex covered in stiff, old petioles. Herbage glabrous. Leaves with long petioles, swollen basally; blades 2–10 cm long, linear-lanceolate in outline, bipinnate; ultimate segments linear, well-separated, 2–5 mm long. Umbels solitary; peduncles 2–30 cm long, erect; rays unequal, 5–30 mm long; involucral and involucel bracts linear, 5–10 mm long. Flowers yellow; sepals scarious-margined, ca. 1 mm long. Mericarps glabrous, elliptic, 3–6 mm long; ribs nearly plane, 1–1.5 mm wide; oil tubes 1 to 5 per interval (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).