Plants perennial, 80–100 cm. Taproot rather thick. Stem solitary, erect, striate. Basal and lower petioles 5–15 cm; blade ovate-triangular, 10–20 × 7–15 cm, 2–3-pinnate; ultimate segments ovate-lanceolate to lanceolate, 5–15 × 2–3 mm. Umbels 5–8 cm across; bracts 6–8, lanceolate, 5–15 mm, margins broadly white membranous; rays 10–20, 2–4 cm, unequal; bracteoles 4–7(–9), oblong or oblong-ovate, ca. equal to or longer than pedicels, margins broadly white membranous, apex cuspidate; umbellules 10–20-flowered; pedicels 5–8 mm. Calyx teeth obsolete. Stylopodium conic. Fruit oblong-ovoid, 3–5 × 2–3 mm; ribs subequal. Seed face plane. Fl. Jul–Aug, fr. Aug–Sep.
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