Plants perennial, 40–100 cm high. Root tuberous, usually solitary, sometimes 2 or more, oblong, 1–3 × 0.5–1 cm. Basal and lower leaves long-petiolate; petiole to 5 cm; blade deltoid in outline, 2–3-ternate-pinnate; ultimate segments linear or narrowly lanceolate, 5–10(–15) × 0.5–2 mm, adaxially glabrous, abaxially sparsely hispid along veins. Upper leaves reduced; petioles wholly sheathing; ultimate segments of blade often glabrous. Umbels 5–9 cm wide; rays 8–12(–18), to 3.5 cm, unequal; umbellules many-flowered, 1–2 cm wide; flowers bisexual. Pedicels equaling the fruit; bracteoles 8–12, ovate, glabrous. Fruit 5–8 × 1–1.5 mm; ribs inconspicuous. Fl. and fr. May–Jul.
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