Scandent herb 1-4 m long; stems usually purplish, pilose, with long internodes. Leaves joined by the connate petioles; leaf-blades sagittate or narrowly triangular, 6-11 cm long, 3.5-7 cm broad, acute or somewhat acuminate, basally truncate or slightly cordate, the margin irregularly doubly dentate or serrate, above green, pilose, beneath pale green or grayish green, reticulate venose, the nerves villous with whitish hairs, the lamina glabrous or pilose; petiole 2-5 cm long, winged, the margin entire or denticulate, at the connate base 2-4 cm broad, distally 0.5-1.5 cm broad. Inflorescence of 2-4 pairs of 10-20-flowered axillary cymes; peduncles 6-15 cm long; pedicels 1.5-4.5 cm long, villous with spreading whitish hairs; bracts oblique ovate, sessile, acuminate, dimidiate, irregularly dentate, 3-7 cm long, 2-4 cm broad, subordinate bracts lacking. Flowers with the sepals 9-12 mm long, 6-8 mm broad, somewhat enlarged during ripening of the capsule, yellowish, ovate, caudate acuminate, puberulent on both the surfaces, ciliate; corolla sulphur yellow, the upper lip paler, externally slightly pilose, the upper lip globose, arched over the anthers, 4-6 mm long, 6-9 mm broad, the lower lip inflated, projecting, finally pendent, 15-20 mm long, 8-15 mm broad, saccate to about 1/2 of its length; anthers dark brown, horseshoe shaped, the cells decurved laterally, each 2-3 mm long; filament glabrous, 1-2 mm; ovary covered with a villous tomentum; style almost straight, 5-7 mm long. Capsule 6-7 mm long, ovoid conic, puberulent.
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