Japan Flora: . Smooth glabrous perennial; stems 30-60 cm. long, with several leaves on the upper half; leaves flat, ob­long-ovate or ovate, 6-15 cm. long, 3-8 cm. wide, abrupdy acute to abruptly short-acuminate, rounded-truncate to shal­lowly cordate at base, 5- to 9-ribbed, the 3 median ribs extend­ing to the apex, the peduncles decumbent, 2.5-5 cm. long, with a small bract below the middle, the pedicels 5-8 mm. long, slightly thickened upward; flowers yellowish green, pendulous, one of the 4 perianth-segments larger than the others, 8-10 mm. long, the smaller broadly ovate, 5-7 mm. long, both flat and spreading, obtuse, sparsely and minutely papillose inside; filaments nearly smooth. Apr.-June. Mountain forests.

Honshu (s. Kanto Distr. and westw.), Shikoku, Kyushu.