Japan Flora: Tuber large, depressed-globose, to 25 cm. across; leaf solitary, arising from the center of the tuber, more than 1 m. 切11，the petiole long, spotted with purple, the blade ternate, the primary leaflets again binate or ternate or 2- or 3- parted, the ultimate leaflets or segments pinnately parted on a winged axis, the lobes ovate to narrowly so, caudate-acuminate, 4-8 cm. long, entire, glabrous; scape arising from the center of the tuber, about 1 m. long, with several scales at base; inflores­cence 30-50 cm. long; spathe broadly ovate, tubular-infundi- buliform, with dark purple variegations, glabrous outside, with small protuberances at base inside; spadix with the pistil­late flowers below and continuous with the upper staminate flowers, the appendage erect, much longer than the fertile part, long-exserted from the spathe, dark purple, obtuse; berries yellowish red when mature.  May.

Native of Indochina, widely cultivated in our area for “Konnyaku” or mannan from the tubers.