Plants (30–)50–100 cm. Stem, erect, hollow, much-branched above. Basal leaves petiolate, petiole 6–10 cm; blade broadly triangular, 3–4-pinnately dissected; ultimate segments linear-oblong, 1–2.5 × 0.3–0.6 mm. Upper leaves reduced, similar to basal. Synflorescence much branched; umbels 3–5 cm across; peduncles 3–8 cm; bracts usually 1, narrowly linear, ca. 4 mm; rays 5–7, 1–2.5 cm, subequal; bracteoles 4–6, linear or subulate, 0.6–2.2 mm, unequal; umbellules 6–12 mm across, 6–12(–16)-flowered; pedicels 1–5 mm, unequal. Petals white, ovate to oblong, apex with narrow inflexed lobule. Fruit subglobose, ca. 1.7–2 × 1.3–1.7 mm, base cordate; ribs prominent, carinate, equal. Fl. and fr. Jul–Sep.
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