Japan Flora: Large, fleshy, glabrous, foetid perennial; leaves tufted, long-petiolatc, the blade orbicular, acute, deeply cordate at base, 30-40 cm. long and as wide; flowering before the leaves, the peduncle short; spathe 8-20 cm. long, 5-12 cm. wide, purplish to green, navicular-hemispherical gradually acuminate; spadix ellipsoidal, about 2 cm. long, densely flowered; fruit ripening in summer of the same year. Wet places.
Hokkaido, Honshu (centr. and n. distr.). Amur, Sakhalin, and Ussuri