Japan Flora: Sparsely long-pilose; rhizomes rather long, branched; leaves reniform-orbicular or orbicular, 2-6 cm. long, 2-7 cm. wide, deeply cordate, toothed, very shallowly lobulate, green, with needle-shaped cystoliths; scapes 20-40 cm. long; cymes panicu­late, 10-30 cm. long, with soft glandular-hairs; calyx-lobes recurved after anthesis, 2-4 mm. long; petals spreading, white, the upper 3 broadly ovate, subacute, short-clawed at base, spotted on the lower portion, 3-4 mm. long, the lower 2 larger, unequal, lanceolate, acute, 10-25 mm. long, not spotted; sta­mens 3-5 mm. long, the filaments slightly broadened above; capsules broadly ovoid, 4-5 mm. long, shallowly 2-fid; styles ascending; seeds small, granular-tuberculate. Apr .-May. Mountains.

Honshu (n. and centr. distr. incl. Kanto); rare.