Japan Flora: Tuber depressed-globose or hemispherical; leaves 2, the petiole erect-ascending, 7-20 cm. long; leaflets 3, rhom­boid-ovate, 7-15 cm. long, 3-8 cm. wide, abruptly mucronate, cuneate and sessile at base in the terminal one, rounded at base in the lateral ones, bearing subtranslucent dense papillae on margin; peduncle 10-15 cm. long, shorter than the petiole; spathe dark purple, broadly auricled on the upper margin of the tube, the blade long-deltoid, about 3 cm. wide, 7 cm. long, acuminate, arching over the spadix; spadix-appendage cyl- indric, rather stout, 2.5-3 mm. across, thickened and truncate at base.  Apr.-May.

Honshu (Suruga Prov.), Shikoku, Kyushu.