Tuber 2–2 1/2 in. diam., flattened. Leaf about 2 1/2 ft. diam., glabrous; petiole 1–1 1/4 ft. (or more?) long, smooth; terminal segments 6–8 in. long, 1/2– 3/4 in. broad, the lowest smaller, all linear-lanceolate, gradually acuminate, decurrent at the base. Peduncle 4–6 in. long, glabrous, smooth. Spathe erect, glabrous; tube 2 in. long, 1 in. diam. at the top, convolute, narrowly funnel-shaped, inside longitudinally furrowed, dark purple with a pale zone around the mouth; limb 4–4 1/2 in. long, erect, very concave or somewhat hooded, with the apex directed forwards, wavy on the margins, dark purple. Spadix much shorter than the spathe, sessile; flowering part cylindric, dense, female about 3/4 in. long, male about 1 in. long, both about 4–5 lin. thick; appendix 1 1/2–1 3/4 in. long, about 1/2 in. thick cylindric, obtuse, abruptly contracted at the base, apparently dark purple, smooth. Ovary ovoid, 2-celled; stigma large, subsessile, two lobed. Stamens crowded; filaments stout, 2/3 lin. long; anther-cells subglobose.
