Stem robust, branched, ± sulcate, glabrous. Leaves glabrous; leaf blade ovate-oblong, 8-16 × 5-10 cm, leathery, abaxially with distinct reticulate veins, lateral veins 3 or 4 pairs, adaxially smooth, base rounded or slightly emarginate, margin entire, apex acute; petiole 1.5-3 cm, glabrous. Male peduncle slender; rachis ca. 16 cm, much branched; pedicel robust, 4-5 mm, with articulation; calyx segments ovate-triangular, ca. 2 mm, glabrous, apex acute; corolla pale yellow-brown; segments oblong, 3-3.5 × 1-1.5 mm, apex obtuse. Female peduncle 10-30 cm, sparsely 5-10-flowered; pedicels thick; calyx segments ca. 4 mm, apex obtuse; corolla segments 6-8 mm; ovary obconic-cylindric, 10-12 mm. Fruit brownish, 6-10 × 2.5-5 cm, finely granulate, base obtuse, apex truncate. Seeds oblong, ca. 2 × 1-1.5 cm; wing yellowish or white, surrounding central seed, 5-8 × 1.3-2 cm, base and apex rounded.
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