Climbing herb with branched stems 6–30 m. long, pubescent or puberulous when young but soon glabrescent.. Leaf-blades obovate, elliptic or obovate-oblong, 3–12 cm. long, 1–6 cm. wide, shortly acuminate at the apex, cuneate at the base, glabrous; petioles 0.7–1.5 cm. long; stipules broadly triangular or acuminate, 1.5–2 mm. long, ± glabrous.. Flowers in terminal and axillary inflorescences, sometimes forming ample panicles 2.2–6 cm. long, glabrous to pubescent; peduncles 0.4–3.5 cm. long; pedicels up to 3 mm. long; bracts subulate, 2–3.5 mm. long.. Calyx-tube subglobose, 1 mm. long, pubescent or glabrous; lobes deltoid or ovate, 0.5–1 mm. long, up to 0.5 mm. wide, the margins and midrib ciliolate.. Corolla at first yellow or greenish-white but later orange-red or tube white and lobes bright vermilion; tube 2.5–6 mm. long, 1 mm. wide at the base, 1.7 mm. wide at the apex, glabrous outside, densely yellow pilose in the throat, particularly in long-styled flowers; lobes lanceolate, 2.5–4 mm. long, 1–1.2 mm. wide, thickened at the apices, glabrous.. Stamens included in long-styled flowers but long-exserted in short-styled flowers.. Style 7–8 mm. long in long-styled flowers and 3 mm. long in short-styled flowers, the stigma-arms filiform, 2–3(–4) mm. long.. Capsule subglobose, 3 mm. in diameter, glabrous or puberulous, the valves sulcate.. Seeds brown, 0.5–1 mm. in diameter, with a broad irregularly lacerate circumferential wing.. Fig. 20, p. 182.
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