Plants terrestrial, usually large, arising from hypogean tubers; leaf one, the petiole very long, vaginate only at the base, often tuberculate and maculate, the blade deeply 3-parted, the segments 2-to 3-parted and again pinnately parted; peduncle short, at least during anthesis; spathe oblong, cuspidate-acuminate, con-volute below, open above, persistent; spadix short-stipitate, short-cylindric, free, densely many-flowered, much shorter than the spathe; flowers perfect, perigoniate; sepals 4-8, biseriate, dilated toward the apex and fornicate, irregularly imbricate; stamens 4-6, biseriate, the filaments slightly dilated, subcompressed, abruptly contracted at the apex into the connective; anthers much longer than the connec-tive, linear-elliptic, dehiscent by a vertical slit; ovary ovoid, incompletely 2-to 5-celled, attenuate to the elongate style; ovules solitary; stigmas small, 2-to 5-parted; fruit baccate, surrounded by the perianth, obscurely 2-to 5-lobate; seeds rounded-reniform, somewhat compressed.
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