Plants 40–100 cm tall, hispid throughout. Root fusiform, aromatic. Stem solitary, ca. 8 mm thick at base, branched above. Basal leaves ovate-oblong, nearly as long as petioles, 10–20 × 5–22 cm, pinnate; pinnae ovate or broad-ovate in outline, 1.5–5 × 1–3 cm, deeply divided into 2 or 3 ovate or lanceolate lobes, hispid on both surfaces, adaxially apparently with bullate creases, margins serrate. Cauline leaves gradually reduced upward. Peduncles to 16 cm, densely hispid near apex; bracts 1–3, linear, or absent; rays 10–20, unequal, 2–5 cm, densely hispid; bracteoles 5–7, linear, shorter than pedicels; flowers more than 30 per umbellule. Calyx teeth minute, triangular. Petals white, outer flowers in umbels radiant, enlarged petals broadly obcordate, deeply lobed. Fruit ovoid-elliptic, 6–8 × 5–7 mm, glabrous; vittae solitary in each furrow, 2 on commissure, clavate, extending to 2/3 length of mericarp. Seed face plane. Fl. May–Jul, fr. Aug–Sep.
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