Herb to 200 cm. tall.. Tuber discoid to depressed-globose, up to 5 cm. in diameter or more.. Leaves 2–3; petioles with basal sheaths imbricate, forming green pseudostem to ± 75 cm. or more; free apical part of petiole 5–40 cm. long; blade radiately divided to base, circular in outline; leaflets (5–)9–15, subequal in size, usually narrowly elliptic to elliptic or narrowly oblanceolate to obovate, 4.5–27 cm. long, 1–9 cm. broad, acuminate, base cuneate, margins usually finely serrate-dentate with acuminate teeth up to 2 mm, long, rarely subentire.. Inflorescence equalling or overtopping leaves; free part of peduncle 9–35 cm. long, green.. Spathe 8–31 cm. long; tube cylindric to narrowly obconic, not or hardly constricted apically, 3–12 cm. long, 0.8–3 cm. in diameter, outer surface green with white to yellow longitudinal stripes along veins; limb oblong-lanceolate, sometimes ovate, 5–21.5 cm. long, 1–5 cm. broad, shorter or longer than tube, sometimes with very long filamentous tip, green, rarely purple-brown tinged.. Spadix usually unisexual, rarely with flowers of both sexes present, 3.8–12.8 cm. long, slightly longer than spathe-tube; sterile appendix cylindric to conic, 2–9 cm. long, 0.2–1.4 cm. in diameter, narrowed basally, sometimes truncate with stipe up to 1 cm. long, apex rounded, pale green to yellowish green; staminate spadix ± sessile, fertile part subcylindric, 1.4–4.3 cm. long, 0.4–0.8 cm. in diameter, flowers ± distant; pistillate spadix subsessile, fertile part gradually tapering upwards, 3–5 cm. long, 1.2–1.3 cm. in diameter, flowers congested to ± distant.. Staminate flower composed of 2–3 stamens; anthers dehiscing by subcircular oblique apical slits.. Pistils ovoid, 3–4.5 mm. long, green; ovary 2–2.5 mm. in diameter, tapering to short style with capitate whitish stigma.. Berries subglobose, 0.5–0.8 cm. in diameter, scarlet when ripe, green with yellowish stripes when immature, 3–4-seeded.. Seeds ± 4 mm. in diameter.
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