A large evergreen climber. Stem woody with rusty pubescent shoot, milky juice flows from cut stems; leaves opposite, exstipulate, membranous-coriaceous, ovate to ovate-oblong, abruptly acuminate usually smooth and glabrous, rarely sparesely hairy below, 15-30 x 7-18 cm, petiole 1.25-2.5 cm long, hairy. Calyx segments oblanceolate, tomentose, c. 3.5 cm long, often glandular within, dark red or reddish brown in colour. Corolla 7.5 - 12.5 cm long, campanulate, white or creamish, glabrous or pubescent, lobes 5, c. 2.5 cm long rounded, acute with a short tube. Stamens 5, inserted on the corolla tube, alternating with the lobes; anthers sagittate, connivent to the stigma forming five sided cone, disc 5-lobed. Style filiform, stigma fusiform. Follicles oblong, thick, woody, turgid green. Seeds many ovoid or oblong, compressed, contracted at the top.

Fl. Per.: March - April.

Type: “A native of the hilly parts of Chittagong & Sylhet”.

Distribution: Native to the Eastern Himalayas, cultivated in gardens of Pakistan.

Cultivated for its ornamental flowers, the young branches are used for making course ropes.