Japan Flora: Glabrous green perennial herb from short sparingly fibrillose rhizomes; radical leaves long-petioled, ovate-oblong to ovate, sometimes broadly ovate, subacute to rather obtuse, broadly cuneate to rounded at base, 15-60 nun. long, 10-25 mm. wide, the margin undulate; scapes 10-30 cm. long, slender, simple, erect, the cauline leaves 1-3 cm. long, green, lanceolate, subobtuse, sessile, ascending to appressed; inflorescence elongating after anthesis, very slender, the flowers relatively numerous, the upper tepals filiform, scarcely dilated above, about 10 mm. long, pale greenish, the lower ones sup­pressed; stamens 6, the 3 outer slightly longer than the inner.  Moist places along streams in mountains.

Honshu (Mi- kawa and Kii Prov.), Shikoku, Kyushu (Yakushima); rare.