Japan Flora: Small, glabrous perennial with slender, short-creeping rhizomes and elongate roots covered with prominent root-hairs; steins 10-20 cm. long, glabrous, with 2 or 3, tliinly membranous scaly sheaths at base; leaves 2, opposite, sessile, not sheathed，flat, rounded-cordate, 3-5 cm. long and as wide, glabrous except on the margins, 2- to 5 (-7)-nerved, acute to short-acute, rounded to slightly cordate at base; peduncle solitary, terminal, strongly declined, glabrous, 2-3 cm. long; bracts broadly linear, 1.5-2 cm. long; flowers 2-2.5 cm. across, yellowish green with a purple hue, pendulous, glabrous; perianth-segments acute with an obtuse tip, about 1.5 cm. long; dorsal sepal narrowly ovate, the lateral ones wholly united to the tip; petals broadly lanceolate; lip slightly shorter than the petals. May-June. Woods in mountains;

Hokkaido (s. distr.), Honshu, Shikoku.