Japan Flora: Tuber depressed-globose, more or less irregu­lar in shape, 3-7 cm. across; scalelike leaves 2, whitish, tuni­cate; leaves 2, the petioles terete, 5-20 cm. long; leaflets 9-15, lanceolate, 8-20 cm. long, 1.5-5 cm. wide, undulate, cuneate at base; peduncle erect, elongate after anthesis, 4-8 mm. in di­ameter; spathe light or pale green, the tube cylin dric, slightly ampliate above, the blade obliquely ascending forward, nar­rowly ovate, 7-8 cm. long, gradually acuminate; appendage of spadix linear, 10-15 cm. long, purplish, somewhat thick­ened, long-exserted, gradually thickened at base, the floriferous part often with rather loose hornlike tubercles. Mar.-May. 

Honshu (Hachijo and Miyake Isis, in Izu).