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Corolla tube 10–18 mm. long and widening at 1/2-2/3 of its length into a cyathiform upper part, at the mouth 6–12 mm. wide, puberulous on both sides except for the base inside; corona lobes Ungulate or subulate, 1·5–3·5 x 1–2 mm. minutely papillose or minutely puberulous; corolla lobes ovate, 4–8 x 2·8–5·5 mm., abruptly narrowing into pendulous tails; lobes (including the tails) 36·86 mm. long, puberulous on both sides except for the apex.
Leaves petiolate; petiole 1–5 mm. long; lamina elliptic, obovate, or rarely ovate, 1·4–3(4·6) times as long as wide, 2·5–6·5 x 1·1–3·1 cm., cuneate at the base, rounded, mucronate, acute, or acuminate at the apex (acumen 1–3(7) mm. long), membranaceous or papyraceous, glabrous or sparsely to densely puberulous, with 4–6(8) pairs of secondary veins; tertiary venation conspicuous beneath.
Scandent shrub or climber, 3-8 m high. Flower parts and branchlets pubescent. Calyx lobes 10-13 mm long and 2-3 mm broad. Corolla lobes pendulous, 50-80 mm long. Plumose awn on seed with naked stalk 20-30 mm long. Flowers yellowish with purple markings in throat and on outside of tube.
Follicles divergent at an angle of 180–200°, long-tapering towards the apex and ending in a small knob, 16–29 cm. long and 1–1·5 cm. in diam.; exocarp brown, fairly thick and hard, densely pubescent in young fruits and glabrescent in older fruits, densely lenticellate.
Stamens included for 0·5–2 mm.; filaments curved, 0·9–1·1 mm. high, puberulous or pubescent; anthers 3·3–4·5 x 1–1·3 mm., glabrous, except for a small pubescent patch around the filament; acumen 0·2–0·3 m. long.
Ovary 0·7–1·8 x 1·1–2·4 mm., pubescent in the upper part or all over with erect hairs; style 7–9·6 mm. long; clavuncula 0·9–1·1 x 0·8 x 1·2 mm.; stigma minute.
Inflorescence 1(6)-flowered, sessile or pedunculate, fairly congested if branched, puberulous in all parts; pedicels 3–13 mm. long; bracts sepal-like.
Seed with the grain 12–17 x 2–3 mm., densely short-pubescent; rostrum glabrous for 28–45 mm. and bearing a coma for 30–45 mm.; coma 58–80 mm. long.
Liana, 2–6 m. high; deciduous, flowers and leaves appearing at the same time; latex white or yellow.
Sepals subequal, elliptic or narrowly ovate, 5–14·8 x 1–4 mm., acute, puberulous.
Roots semi-tuberous; trunk up to 1–25 cm. in diam.; branchlets puberulous.
