Underground part a broad and flattened rhizome, to 5 × 2.5cm, to 1.8cm high, producing numerous small, fusiform offsets. Petiole green, 20–40cm; leaf blade pale green abaxially, green adaxially, entire, cordate-hastate, ovate or deltoid in outline, 7–10 × 7–9cm, terminal lobe ovate, basal lobes ovate to deltoid. Inflorescence appearing alongside leaves; peduncle pale green, 9–11cm. Spathe convolute at base, green, ellipsoid to ovoid, 1.6–4cm × 8–15mm, distinctly constricted at apex; limb spreading, inside greenish purple to dark purple, ovate, 12–18 × 4–5cm, long cuspidate. Spadix erect, subequaling spathe; female zone conic, 1.5–3mm, 3–4mm in diam. at base; ovary cream-colored; stigma sessile, reddish or pale pinkish; sterile zone 1.7–4cm, proximal 7–8mm covered with densely congested staminodes, rest naked, terete; staminodes ascending or variously curved, yellow or basal part reddish, narrowly fusiform, ca. 4mm; male zone 4–9mm; stamens yellow, sub-sessile; anthers orange; appendix narrowly conic, 10–13cm, proximally corrugate, distally smooth, tapering to sharply acute apex, base truncate or obliquely truncate, usually with a stipe 5–7mm. 2n = 52.