Plants 5–130 cm. Stem glabrous. Basal leaf blade broadly triangular in outline, ternate/3–4-pinnatisect; ultimate segments elongate, narrowly linear, (1–)3–10 × 0.1–0.3 cm, glabrous. Stem leaves less divided than basal, upper leaves with bladeless, lanceolate sheaths. Umbels 5–15 cm across; bracts 3–7, subulate to linear, unequal; rays 15–25(–30), unequal, spreading in flower, becoming rigidly contracted; bracteoles 5–13, linear to subulate, unequal, shorter than flowers; umbellules 25–30-flowered. Calyx teeth conspicuous, triangular. Petals pale yellow, elliptic, with a narrowly inflexed apex. Stylopodium styles short. Fruit ellipsoid, 8–9 × 4–5 mm; dorsal ribs filiform, slightly prominent, lateral narrow-winged; vittae 1 in each furrow, 2 on commissure. Fl. Jul–Aug, fr. Aug–Sep.
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