Byttneria grandifolia DC., Prodr. 1: 486. Jan. 1824. Buenneria aspera.Colebr. ex Wallich in Roxb., Fl. India 2: 383. March-June 1824; Masters in Fl. Brit. India 1: 371. 1874.

Large, woody climbers or trees; bark dark brown, longitudinally or spirally close furrowed on old stems; branchlets grooved, stellate pubescent. Leaves 10 - 20 cm in diam., suborbicular or broadly ovate-oblong, cordate at base, obtuse or abruptly acuminate at apex, entire or obscurely repand, chartaceous, glabrescent and shining above, puberulous on nerves beneath, 5 - 7-nerved at base; petioles 5 - 13 cm long, grooved, puberulous; stipules 8 - 12 mm long, linear-lanceolate, early caducous. Flowers minute, in axillary, umbellate cymes; pedicels slender; bracts and bracteoles subulate. Sepals ca 3 x 1 mm, lanceolate to deltoid, hairy outside. Petals ca 2 mm long with short, narrow claw and limb with hood and an entire appendage which enter into the staminal cup covering the anther lobes. Anther lobes reniform, divergent; staminodes ovate. Ovary ca 1 mm in diam., styles about as long as ovary, 5-fid at tip. Capsules 2 - 4 cm in diam., globose, woody, covered with stout sharp, distant, curved prickles. Seed 1 in each locule, ca 12 x 7 mm, elliptic-oblong, triangular.

Fl. April- June; Fr. Sept. - March.

Distrib. India: Bihar, West Bengal, Sikkim, Assam, Arunachal Pradesh, Megbalaya and Andaman & Nicobar Islands.

Nepal, Bhutan, Bangladesh, S. China, and Indo-China.

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