Decumbent or twining herb, with clear sap in all parts. Leaves opposite, coriaceous, pubescent; ovate or ovate-elliptic or elliptic, 2.4–5.1 × 1.5–2.4 cm, apex acute, margins entire and ciliate; base acute, obtuse to rounded with 1–2 small colleters. Inflorescences 1–2-flowered cymes, extra-axillary. Calyx deeply 5-parted; lobes yellowish green or reddish brown, linear, sharply acute at apex, abaxially pubescent. Corolla tubular-funnel shaped, upright,
curved; corolla tube yellowish white to pinkish white with reddish brown bands or dot lines alternate to the sepals, glabrous, 2.9–3.7 cm long, inflated at base, the interior of the inflated portion maroon, purple brown to dark purple and covered with long white hairs; corolla lobes lanceolate, apex acute, each lobe reduplicate from near the base, tip connated, lower part of lobe yellow, covered with long white hairs only at the midrib, upper part of lobe green, with purplish hairs. Corona double, interstaminal
corona formed by five lobes, joined to form a shallow
cup, apex of lobes bifid, segments triangular, purple to dark
purple and covered with white hair. Pollinium broadly ovoid, yellow. Fruits follicles usually 2, linear-lanceolate in outline, green when young but turning reddish brown with age. Seeds oblong, brown; coma silky white.