Tuber dark brown, subglobose or depressed globose, to 10 cm high, to 12 cm in diam., developing numerous offsets annually, these shortly narrowly fusiform, 1-3 × ca. 1 cm. Leaf solitary; petiole green or grayish green with numerous elongate, confluent, pale green or brownish green spots, 30-60 × 1-1.5 cm, glabrous; leaf blade to ca. 100 cm in diam., rachises winged throughout; leaflets dark green adaxially, elliptic-lanceolate, 3-21 × 1.5-7 cm, acuminate. Inflorescence solitary, long pedunculate, producing a scent of fresh carrots; peduncle colored as petiole, 20-60 cm, 0.7-1.8 cm in diam. at base. Spathe shortly convolute at base, outside bright pale green, basally with rounded white spots, these distally grading to whitish green, inside base or a larger patch reddish purple, remainder and limb as outside but paler, broadly ovate, strongly concave, 8.5-24 × 8.5-23 cm, base within ridged-verruculose, apex acute, overarching spadix. Spadix stipitate or rarely nearly sessile, slightly shorter than spathe, 8-20 cm; stipe colored as peduncle but much paler, 0.5-1.5 cm; female zone cylindric, distal part occasionally broadened, 0.5-2.5 × 1-2.2 cm, flowers congested; ovary pale green, depressed, angulate in cross section, 1-1.5 mm high, 2-3 mm in diam., 2-or 3-loculed, with 1 basal ovule per locule; style pale green, 0.5-1 × 0.8-1 mm; stigma yellowish, flattened, ca. 1 mm high, ca. 2 mm in diam., 2-or 3(or 4)-lobed, oval or triangular in cross section, scabrous-verrucate, lobes obtuse; male zone broadly fusiform, 1.8-3 × 1.3-3.5 cm, flowers congested; male flowers consisting of 4 or 5 stamens; stamens ca. 3 mm; filaments ca. 1.5 mm, basal 1/3 connate; anthers butterfly-shaped in cross section, ca. 1.5 × 1.5-1.8 mm; pores elongate, apical but near margin, sometimes connected by an eccentric groove; pollen striate; appendix ivory-white, narrowly to broadly conic, usually slightly dorsiventrally compressed, occasionally substipitate, variable, hollow, 3-14 cm, 1.3-4.5 cm in diam. near base, glabrous or entirely echinate or verruculose, or only distal 1/3 so, base constricted and sometimes grooved, apex subacute or obtuse. Infructescence: fruiting zone cylindric, ca. 12 × 5 cm. Berries crowded, shortly stalked, glossy dark blue, elongate, to ca. 1.8 × 1.5 cm.
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