Japan Flora: Glabrous, erect perennial, blackened when dry, with ovoid tuberous roots; stems 20-50 cm. long; principal leaves 3-5, on lower part of stem, alternate, broadly lanceolate, 5- 10 cm. long, 1.5-2.5 cm. wide, short-acuminate, the reduced upper leaves few, appressed to the stem; spike 1G-20 cm. long, rather many-flowered; bracts broadly lanceolate, 5-10 mm. long; flowers green; dorsal sepal narrowly ovate, rather obtuse, die lateral sepals obliquely oblong, obtuse, reflexed at anthesis; petals narrowly ovate, nearly as long as the lateral sepals, erect; lip 3-lobed nearly to the base, about 2 mm. long, the lateral lobes 6-7 mm. long, the terminal lobe short, obtuse, lanceolate; spur clavate, 3-4 mm. long; ovary 5-7 mm. long. Sept.-Oct. Grassy places in lowlands;

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