Cardamine anemonoides O. E. Schulz, Bot. Jahrb. Syst. 32: 340. 1903; Dentaria corymbosa Matsumura, Bot. Mag. (Tokyo) 13: 52. 1899; Cardamine matsumurana Nemoto, Fl. Japan Suppl. 263. 1936; not C. corymbosa J. D. Hooker, Icon. Pl. 7: 686. 1844. TYPE: Japan, select one of the five syntypes. (lectotype, TI!).

Cardamine anemonoides var. suavis O. E. Schulz, Bot. Jahrb. Syst. 32: 341. 1903. TYPE: Schikoku, Prof. Tosa, pr. Nanokawa, 17 Apr 1890, Watanabe s.n. (holotype, GH!).

Herbs, perennial. Rhizomes creeping, scaly, subfleshy, without tuberous knots, 1–3 mm in diam., not stoloniferous. Stems , 6–30 cm, slender, erect, simple, glabrous. Rhizomal leaves withered by flowering time; cauline leaves 2–5, trifoliolate or very rarely simple, not auriculate, hirsutulous with antrorse trichomes 0.3–0.5 mm; petiole (0.5–)1–3.5 cm; terminal leaflet (or leaf when simple) broadly ovate, lanceolate, or elliptic, rarely obovate, 1–6 ´ 0.6–2.5 cm, on a petiolule to 1 cm, base cuneate, margin ciliolate antrorse trichomes to 0.1 mm, crenate-serrate to serrate, the teeth mucronate, apex acute to acuminate; lateral leaflets 1 pair, sessile, similar to terminal leaflet in shape but smaller and often with oblique base. Racemes ebracteate, 2–7-flowered; fruiting pedicels ascending to suberect, 1–2.5 cm, straight, slender. Sepals narrowly oblong, 3–4 ´ 1–1.5 mm; petals white, narrowly obovate, 6–10 ´ 2–3 mm, apex rounded; median filament pairs 5–6 mm, lateral pair 4–5 mm; anthers oblong, 1.2–1.5 mm; ovules 8–20 per ovary. Fruit linear, 3–4.7 cm ´ 1–1.5 mm; valves smooth, glabrous; style 3–8 mm. Seeds brown, oblong, 1–15 ´ 0.7–1 mm.

Flowering: Apr–May.

Habitat: mountain forests.

Elevation: 500–1300 m.

Distribution: Japan (Honshu).