Plants, 4–10 cm, usually acaulescent. Taproots stout, to 10 cm. Leaves petiolate; blade oblong-lanceolate in outline, 2–3-pinnate; primary pinnae 4–6 pairs, pinnatifid; ultimate segments linear-lanceolate, 1–3 × 0.5–1 mm. Umbels 4–8 cm across; bracts 3–5, oblanceolate to obovate, 1–2-pinnate, to 2 cm; rays 5–10, 2–7 cm, unequal; bracteoles 6–10, similar to bracts, longer than flowers. Calyx teeth obsolete. Petals white, base shortly clawed. Styles about equaling stylopodium, spreading-ascending. Fruit broadly ovoid, ca. 2.5 × 2 mm, scattered-tuberculate; vittae solitary in each furrow, 2 on commissure. Seed face slightly concave. Carpophore undivided. Fl. and fr. Jul–Oct.
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