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Corolla tube 14–25 mm. long, widening at 1/7-1/4 of its length into a cylindrical or slightly infundibuliform upper part, at the mouth 6–13 mm. wide, glabrous outside and puberulous inside; corona lobes subulate, (1·3)2–5 x 1–1·6 mm. puberulous; corolla lobes ovate, 5–10 x 3–6 mm., gradually narrowing into the spreading tails; lobes (including the tails) 30–59 mm. long, glabrous on both sides but puberulous near the base.
Leaves petiolate; petiole 1–6 mm. long, lamina ovate, narrowly ovate, or elliptic, 1·7–4(5) times as long as wide, 3–6 x 1–2 cm., cuneate at the base, rounded or acuminate at the apex, rarely acuminate (acumen up to 3 mm. long), sometimes with a revolute margin, chartaceous or thinly coriaceous, glabrous with 3–6(8) pairs of secondary veins; tertiary venation inconspicuous.
Shrub or slender climber. Leaves glabrous, 10-20 mm broad. Flower parts glabrous. Calyx lobes shorter than 10 mm and 1-2 mm broad, linear-subulate, recurved. Corolla lobes spreading, 30-50 mm long. Plumose awn on seed with naked stalk 20-30 mm long. Flowers with pink to mauve tube, lobes yellow.
Follicles divergent at an angle of 180–230°, tapering into a narrow obtuse apex, sometimes apically curved inwards at the apex, 11–24 cm. long and 1·5–2 cm. in diam.; exocarp brown or red-brown, thick and hard, glabrous, very densely lenticellate.
Trunk up to 2·5 cm. in diam., older branches with longitudinal corky ridges up to 6 cm. long and 1·5 cm. high, younger branches with triangular flat protuberances at the nodes; branchlets glabrous.
Seeds with the grain 10–18 x 2·2–4 mm., densely pubescent; rostrum glabrous for 18–40 mm. and bearing a coma for 25–65 mm.; coma 45–85 mm. long.
Stamens included for (0·6)2·7–6 mm., filaments straight or slightly curved, anthers 6·4–8·6 x 1–1·5 mm., glabrous; acumen 1·8–3·8 mm. long.
Sepals subequal, recurved for half their length, ovate or narrowly ovate, 2–6 times as long as wide, 3–10 x 1·5–2·5 mm., acute, glabrous.
Ovary 0·9–2 x 1·7–2·8 mm., glabrous; style 4·5–7 mm. long, smooth or wrinkled; clavuncula 1·4–2 x 1·3–1·9 mm., stigma 0·2–0·7 mm. high.
Inflorescence l–2(5)-flowered, glabrous in all parts; pedicels 3–10 mm. long; bracts sepal-like.
Liana, 3–12 m. high, deciduous, flowers appearing before or with the leaves; latex white.
