Japan Flora: Rhizomes elongate, the internodes 5-15 mm. long; leaves membranous, deciduous, long-petioled, usually 2, approximate, cordate, 6-15 cm. wide, abruptly acuminate, deeply cordate at base, loosely pilose on margin and on both sides; flowers solitary, terminal, the pedicels 3-4 cm. long, longer than the flowers, loosely pubescent with multicellular hairs, the perianth-segments ovate, slightly united at base, forming a short false tube on lower half, reflexed on upper half. Mar.-May. Woods in mountains;

Honshu, Shikoku, Kyushu.