Japan Flora: Tuber depressed-globose; pseudostem 20-80 cm. long; leaves 2, the lower one larger, the petiole 5，］5 cm. long; leaf­lets 9-18, lanceolate, Jinear-lanceolate, or oblong, acuminate, serrulate or entire (forma integrum Nakai); scape 5-15 cm. long; spathe green or purplish above, upper margins of the tube recurved, the blade dekoid-ovate, 5-7 cm. long, sub­abruptly acute, tip obliquely declined over the spadix; spadix­appendage linear, rounded, about 2 mm. in diameter at apex, to 6 mm. in diameter at base.  May-June.

Honshu (Kanto and n. distr. on the Pacific side)