Japan Flora: Rhizomes short, slender; stems 10-20 cm. long, slender, 2-leaved near the middle, the lower portion glabrous, the upper part glandular-puberulent; leaves deltoid-reniform or deltoid-cordate, 8-20 mm. long, 1-2.5 cm. wide, obtuse, mucronate, slightly cordate to truncate at base; scalelike leaves absent; racemes loosely 4-10 flowered; flowers greenish yellow or purplish; bracts spreading, deltoid-ovate, rather acute, about 1 mm. long; sepals spreading, narrowly oblong, obtuse, 1.5-2 mm. long, the petals narrowly ovate, nearly as long as the sepals; lip spreading, cuneate, 25-3.5 mm. long, deeply bifid, toothed at the base, the lobes linear; ovary pedicelled; capsules ellipsoidal, 3-4 mm. long, slightly shorter than the pedicels. July-Aug. Woods in high mountains;

Hokkaido, Honshu (centr. and n. distr.), Shikoku; rather rare. Europe, Siberia, and N. America.

The Japanese phase has relatively smaller flowers and broader leaves than the plant in Europe and is sometimes called var. japonica Hara.