Tuber 2 1/2–3 in. diam., depressed-globose. Leaf about 2 ft. diam., glabrous; petiole 1–2 ft. long, smooth, green; terminal segments 3–5 in. long, 1 1/4–2 1/4 in. broad, the others smaller, all elliptic-obovate or elliptic-oblong, shortly and abruptly acuminate, narrowed to a decurrent base. Peduncle 1/2–1 1/4 in. long, smooth, green. Spathe small, 2–3 in. long, obliquely campanulate; tube convolute, about as broad as long, its margin recurved, forming a broad wavy frill dorsally prolonged into a short, broadly ovate, spreading, obtuse apex; outside pale greenish-white with darker lines; inside of tube with numerous longitudinal crisped rugosities, rich dark purple with a broad white zone around its mouth, frill and apex dark purple-brown. Spadix about twice as long as the spathe, sessile or subsessile; flowering part cylindric, female 3–4 lin. long, male 5–9 lin. long, separated from the female by a naked space 1–1 1/2 lin. long; appendix 2 1/2–3 3/4 in. long, 4–8 lin. thick, conoid or conoid-fusiform, obtuse. Ovaries not crowded, subglobose, 2-celled; stigma sessile, very stout, 2-lobed.
