Plants perennial, 30–50 cm, generally pubescent throughout. Root cylindrical, 10–20 × ca. 1 cm. Stem much-branched. Basal and lower petioles 5–20 cm; blade ternate-2-pinnate; ultimate segments ovate or ovate-lanceolate, setulose on the veins. Upper leaves 1-pinnate or 2–3-lobed; lobes lanceolate. Umbels 3–11 cm across; bracts 0, occasionally 1, linear, like uppermost leaf; rays 5–25, 0.2–7 cm, stout, extremely unequal; bracteoles 2–8, linear, 1.2–2.3 mm, unequal; umbellules 7–12 mm across, 10–25-flowered; pedicels 1–10 mm, very unequal. Calyx teeth obsolete. Petals white, ovate or broad-ovate, base cuneate, apex notched with incurved lobule. Stylopodium conic; styles ca. equal to stylopodium. Fruit ovoid-globose, 1.8–2 × 1.5–2 mm, sparsely pubescent or glabrescent; vittae 2–4 in each furrow, 4–6 on commissure. Seed face plane. Fl. Jul–Aug, fr. Aug–Oct.
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