Plants 25–50 cm. Caudex branched. Stems several, much-branched from base or middle, solid, rigid, finely grooved, glabrous. Leaf blade broadly ovate, 7–10 × 3–5 cm, 2-pinnatisect; ultimate segments linear, 20–40(–80) × 0.5–1(–1.5) mm, glabrous, margins revolute. Synflorescence paniculate; umbels 2–4 cm across; bracts absent or 1–2, subulate, 1–3 × 0.5–1 mm; rays 6–10, 0.6–2(–2.5) cm, subequal, glabrous; bracteoles 6–8, lanceolate or linear-subulate, shorter than flowers, usually reflexed, glabrous, margin scarious; umbellules 8–15-flowered; pedicels 2–5 mm. Calyx teeth obsolete. Petals white, costa yellow, emarginate, glabrous. Ovary and fruit with a white, membranous disk at base, disk 0.6–1 mm across, persistent. Stylopodium conic; styles reflexed. Fruit ellipsoid or narrowly ovoid, dorsally compressed, 2.7–4.5 × 0.9–1.3 mm, finely papillose or slightly scabrous, sometimes subglabrous; ribs equal, prominent, filiform or shortly keeled; vittae 1 in each furrow, 2 on commissure. Fl. Jun–Jul, fr. Aug–Sep.
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