Plants 12–15 cm high. Taproot bearing numerous dark brown fibrous roots. Stem erect, unbranched. Basal leaves several; petiole 5–15 cm; blade cordate to reniform, 2–3.5 × 4–7 cm, 3-parted, segments distally irregularly serrulate; central segment obovate, base cuneate, midrib elongate to tip, apex acute to subtruncate, usually shallowly 3-lobed; lateral segments broadly obovate or oblique-rounded, parted to middle or below. Bracts 2, opposite, foliaceous, 2–3-parted, lobes obovate, 2.5–3.5 × 1–2 cm, serrulate; rays 3, 0.5–3.5 cm; bracteoles 3–6, narrowly lanceolate or linear, 0.5–1.5 mm, entire or 1–2-serrate; umbellules many-flowered. Staminate flowers ca. 20 per umbellule, pedicels ca. 2 mm; calyx teeth ovate or ovate-lanceolate; petals purplish red. Fertile flowers 3 per umbellule, sessile; calyx teeth narrowly deltoid ca. 2 mm; petals ca. 2 × 1 mm; styles about 2 times as long as calyx teeth, recurved. Fruit ovoid-globose, ca. 4.5 × 4 mm, covered with tubercles and straight or slightly curved spinules; vittae 5. Fl. May.

Wet valleys, swamps, roadsides; 200–600 m. Heilongjiang [S Japan, Korea].