Perennial erect herb, with clear latex in all parts. Leaves opposite, linear to linear-lanceolate, slightly V-shaped in cross section, coriaceous, attenuate at base, acute to acuminate at apex, margins entire, lightly revolute with scattered hairs. Inflorescence a 1-flowered cyme, axillary or extra-axillary. Calyx deeply 5-parted; sepals yellowish green to green, linear-lanceolate, sharply acute at apex, glabrous. Corolla tubular-urceolate, upright, not curved; corolla tube almost brown to purple–brown with 5 white bands opposite to the sepals, glabrous, slightly inflated at base; lobes narrowly linear-lanceolate, drawn out into long tails, brown to purple–brown; basal part loosely twisted; margins slightly reflexed; upper parts overlapping and tightly right twisted. Corona double. Pollinium broadly ovoid, yellow. Ovaries 2, glabrous. Follicles usually 2, linear-lanceolate in outline, green when young and turning reddish–brown with age. Seeds oblong, coma silky white.
