Japan Flora: Rhizomes slender, elongate, 3-4 mm. in diameter; stems 20-40 cm. long, glabrous; leaves oblong or elliptic, rarely broadly lanceolate, 4(-5), 4-10 cm. long, 1.5-4 cm. wide, acuminate, acute at base, sessile, 3-nerved; flowers solitary, the peduncle 3-10(-15) cm. long, erect; outer tepals green, 1-2 cm. long, 3-8 mm. wide, acuminate; stamens 8, the filaments 3-4 mm. long, as long as the anthers, the connective not extended beyond the anther; styles 4. May-Aug. Woods in mountains;

Hokkaido, Honshu, Shikoku, Kyushu.

var. penduliflora Murata & Yamanaka. Differs from the typical phase in the flowers nod-ding at anthesis and the leaves narrower, 8-24 mm. wide; Shikoku.