Herb to 120 cm. tall.. Tuber depressed-globose, 2–6 cm. in diameter.. Leaves usually 2; petioles with basal sheaths imbricate, forming green, purplish-or red-mottled pseudostem up to 100 cm. tall; free apical part 8–23 cm. long; blade subcircular to reniform in outline, compound, radiate to ± compactly pedate, divided to base, leaflet bases up to 0.7 cm. apart; leaflets 5–7(–9), central 1–3 the largest, lateral leaflets decreasing in size outwards, elliptic to obovate, acuminate, base unequally cuneate, largest 8–26 cm. long, 2.5–10.5 cm. broad, margins entire or crisped, rarely obscurely serrate-dentate.. Inflorescence ± equalling or overtopping leaves; free part of peduncle 14–26 cm. long, green.. Spathe 16–28 cm. long; tube cylindric to somewhat obconic, not constricted apically, 6–15 cm. long, 1.7–3.5 cm. in diameter, outer surface glaucous green with white, yellowish or purplish stripes along veins; limb ovate or oblong-ovate, long-acuminate, 10–13 cm. long, 3–5.5 cm. broad, longer or shorter than tube, often with filamentous tip up to 4 cm. long, green.. Spadix normally unisexual, 9–17 cm. long, just overtopping spathe-tube; sterile appendix cylindric to clavate, sharply narrowed and subtruncate basally with short stipe, 5–9 cm. long, 0.7–1.4 cm. in diameter, apex rounded, pale green to greenish yellow; staminate spadix subsessile, fertile part subcylindric, 2.5–7 cm. long, 0.7–1.4 cm. in diameter, flowers distant; pistillate spadix subsessile, fertile part gradually tapering upwards, usually with a few subulate sterile projections at appendix base, ± 4.5 cm. long, 1.1 cm. in diameter, flowers ± congested.. Staminate flower composed of 3–5 stamens; anthers dehiscing by subcircular oblique apical slits.. Pistil ovoid, 3–4 mm. long, green; ovary 2–2.5 mm. in diameter, tapering to short style with capitate stigma.. Fruiting spadix to 12 cm. long, without appendix. Berries subglobose, 0.5–1 cm. in diameter, 2–4-seeded.. Seeds 4–5 mm. in diameter.
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