Plants 50–100 cm. Stem weakly-erect, branched above, branches 4-angled, remote, flexuose. Basal leaves petiolate; blade broadly ovate-triangular, ternate-3-pinnately dissected; ultimate segments lanceolate or ovate, 5–10 × 2–3 mm, margins with bristles, apex 2–3-lobed. Upper leaves smaller, heteromorphic; ultimate segments linear, elongate, 20–30 × 1–2 mm, usually entire. Umbels 1.5–3.5 cm across; peduncles 1–4 cm; bracts absent; rays 4–7, 6–10 mm, subequal, 4-angled, very slender, divergent; bracteoles few, minute, ca. 1.5 mm; umbellules 4–8 mm across, 3–8-flowered; pedicels 2–3 mm. Fruit ovoid-globose, ca. 2 × 1.3 mm; ribs narrowly winged, wings irregular, coarsely toothed. Fl. and fr. Jul–Sep.
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