Plants 40–80 cm, monocarpic. Caudex simple, 1–2 cm thick. Stem solitary, much-branched from middle, solid, finely grooved, minutely puberulent or almost glabrous. Basal leaves numerous, long-petiolate; blade triangular-ovate, 6–10 × 5–8 cm, 3-pinnate; pinnae petiolulate; ultimate segments lanceolate or linear, 3–10 × 1–2 mm, margins entire, narrowly revolute, apex mucronate. Synflorescence paniculate; umbels 2–5 cm across; bracts absent; rays 2–10(–15), 0.5–2 cm, slightly unequal, scabrous-pubescent; bracteoles 12–15, ovate-lanceolate, 2–3 × ca. 2 mm, bases connate to the middle, abaxially villous; umbellules 22–30(–40)-flowered, densely capitate, flowers sessile. Calyx teeth obsolete. Petals white, abaxially puberulous. Stylopodium depressed; styles slightly elongate, divergent. Fruit oblong, slightly dorsally compressed, 5–6.5 × 2–3 mm, densely tomentose; dorsal ribs thick, acute, prominent, lateral ribs slightly broader than dorsal; vittae 1 in each furrow, 2 on commissure. Fl. and fr. Jul–Sep.
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