Japan Flora: Tuber depressed-globose, about 4 cm. across; pseudostem 2(M0 cm. long; leaves 2, the lower one larger, 11> to 13-foliolate, with an erect spreading petiole about 10 cm. long, the upper one smaller, with a petiole about 5 cm. long, 5- to 9-foJiolate; leaflets narrowly oblong or narrowly lanceo­late, entire; peduncle 15-17 cm. long, longer than the leaves; spathe-tube 6-6.5 cm. long, 1-1.5 cm. in diameter, purplish, with longitudinal pale stripes, the spathe blade broadly ovate or deltoid-ovate, acuminate, declined over the spadix, purple to dark purple with longitudinal white stripes, 3-5 cm. wide; spadix-appendage narrowly cylindric. Mar. 

Tuber depressed-globose, with few lateral tubers; pseu­dostem 30-50 cm. long; leaves 2, the lower one larger, the petiole nearly erect, 10-25 cm. long; terminal leaflet oblong to broadly lanceolate, 10-30 cm. long, 3-8 cm. wide, abruptly acuminate; peduncle 10-30 cm. long; spathe with the upper margin of the tube narrow, recurved, the blade narrowly ovate or oblong, 6-9 cm. long, obliquely bent downward, straight, long-acuminate, dark purple (forma japonicum) or green (forma viridans T. Koyama), longitudinally white-striped; spadix-appendage cylindric, 1-3 (-5) mm. in diameter, not thickened above, smooth, slightly thickened and truncate at base.  Apr.-May.

Honshu (Echizen, Mino, Omi Prov. and westw.), Shikoku, Kyushu.

var. brachyspatha T.Koyama.  Spathe­blade considerably shorter, bent forward horizontally, abruptly narrowed at apex, short-acuminate, otherwise with the charac­ters of the typical phase. Honshu (Suruga, Mikawa, Owari Prov. and elsewhere).

var. akitense Nakai Leaflets larger, oval to obovate-oval, to 10 cm. wide, otherwise with the characters of the typical phase. Honshu (Ugo Prov.);