Japan Flora: Tuber depressed-globose; pseudostem 20-80 cm. long; leaf solitary, the petiole terete, 7-15 cm. long; leaflets 7-11, ovate to oblong, sometimes obovate, abruptly cuneate-acuminate at tip, entire (forma integrum Nakai) or serrulate (forma serrula- tum Nakai), the terminal one as large as or sometimes slightly smaller than the next lateral ones, 10-20 cm. long, 3-7 cm. wide; peduncle 3-10 cm. long at anthesis, later elongating; spathe light green, marked with a dark purple transverse band inside, the upper margins of the tube scarcely recurved, the blade deltoid-lanceolate, 5-6 cm. long, gradually long- acuminate, erect or slightly oblique, in part dark purple; spadix-appendage narrowly cylindric, slightly bent forward and somewhat thickened at apex, slightly thickened and trun­cate at base. Apr.-May.

Honshu (Shimotsuke, Musashi, Sagami, Idzu, Shin ano, Ugo and elsewhere).

var. atrolinguum (F. Maekawa) Kurata. Blade of spathe dark purple, slightly arching over the spadix.  Honshu (Sagami, Idzu)