Japan Flora: Rhizomes stout and very short, ascending, 1.5-2 cm. in diameter; stems stout, terete, 30-80 cm. long, glabrous or sometimes scattered pubescent; leaves 8-10, broadly lanceolate to narrowly obovate-oblong, 20-30 cm. long, 3-8 cm. wide, abruptly acuminate, gradually narrowed below to the subsessile base; peduncles solitary, 1-flowered, 3-8 cm. long; outer tepals &-10，white, spreading, narrowly oblong, narrowly ovate to broadly lanceolate, 3-5 cm. long, acuminate; anthers 5-8 mm. long, nearly as long as the filaments, the connective not extended beyond the anther; styles about 8.June-Aug. High mountains;

Honshu (n. and centr. distr.).