Plants 15–30 cm. Rootstock 2.5–5 × 0.5–1.8 mm, stout, often branched. Stems 1–3, 1–3-branched or unbranched. Basal petioles 8–15 cm, sparsely pubescent, sheaths broadly ovate; blade triangular in outline, 2–9 × 3–10 cm, 2-pinnate; pinnae 3–7 pairs, basal pinnae petiolulate; ultimate segments oblong-ovate, 5–10 × 3–5 mm, margins serrate, abaxially sparsely pubescent along veins. Upper leaves 1-pinnate. Umbels 1.5–5 cm across; bracts 1–4, linear-lanceolate, 2–4 mm, or absent; rays 2–8, 1–3 cm, subequal; bracteoles 5–8, 1–2 mm, similar to bracts; umbellules 2–12 mm across, 10–15(–20)-flowered; pedicels 2–4 mm, unequal. Calyx teeth subulate, ca. 0.2 mm. Petals white, apex subacute. Young fruit oblong, ca. 1 × 0.6 mm (mature fruit unknown). Fl. Jul–Aug.
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