Japan Flora: tuber depressed-glo­bose, bearing several to rather many small lateral tubers; leaf solitary (very rarely 2), the petiole terete, nearly erect, 30-50 cm. long, the leaflets 11-15, oblanceolate to broadly lanceolate, acuminate, the terminal one 10-18 cm. long, 2-3.5 cm. wide; peduncle 10-20 cm. long, arising 7-15 cm. above base of petiole; spathe dark to bronze-purple, sometimes reddish purple, the blade ovate to broadly so, abruptly long taillike at tip, strongly arching over the spadix; spadix-appendage filiform, 40-60 cm. long, long-exserted, the upper half bent abruptly downward and pendulous, gradually thickened below forming a smooth oblong enlargement then gradually passing into the floriferous part. Apr.-May.

Hokkaido (Oshima and Hidaka Prov.), Honshu, Shikoku.