Usually a straggling half-shrub, sometimes a large, woody climber; twigs glabrous. Leaves ovate-lanceolate (to ovate), (7-)10-12 by 2-5.5 cm, thin-chartaceous to pergamentaceous, base rounded to cuneate, apex long and slenderly acute-acuminate; midrib sunken above; nerves c. 5-8 pairs; petioles ¾-1 cm. Inflorescences terminal and in the upper leaf-axils, together making a pyramidal leafy panicle; lower axillary branches up to 6 cm, the terminal inflorescence c. 3 cm, all sparsely pubescent. Bracts acutely triangular to subulate, up to 4 mm long, ciliate and pubescent on the prominent midrib beneath. Pedicels c. 0.75 cm, bibracteolate. Sepals oblong-ovate, 2½-3½ by 1.25-1.75 mm, acute, erect, outside glabrous or slightly pubescent on the thicken ed to keeled midrib, inside glabrous; no colleters Corolla 1-1.5 cm long, bright yellow to orange, the tube outside brownish, mouth spotted with red, the tube 7-9 mm, thin, fully glabrous, lobes blunt to acute. Stamens inserted about the middle of the tube, filaments 3.5-4 mm long, anthers oblong-ovate to lanceolate, 1½-2 mm long, acute. Ovary oblong to obovoid-lanceolate, 2-2½ mm; style 8-12½ mm. Fruits ellipsoid, 4-10 by 3-4 mm, smooth and glabrous, papyraceous, the valves split at the top. Seeds c. 8 per cell, elliptic to bean-shaped, 3.5 mm ø, warty, the central part hairy, winged all around.
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Climbers, twining, to 12 m. Petiole 6--12 mm; leaf blade ovate, narrowly ovate, or very narrowly ovate, 5--12 X 2--6 cm, membranous to papery, base broadly cuneate to subrounded, apex acuminate, lateral veins 5--7 pairs. Thyrses with main nodes each having 2 lateral cymes and a continuing main axis; bracts acutely triangular to awl-shaped, to 4 mm, ciliate. Pedicel 3--8 mm. Corolla yellow to orange, 1.2--1.9 cm; tube 7--10 mm, outside brownish, mouth with reddish spots; lobes ovate, 5--9 mm, apex blunt to acute. Stamens inserted at middle of corolla tube; filaments 3.5--4 mm; anthers narrowly ovate, 1.5--2 mm, exserted. Ovary narrowly ovoid, 2--2.5 mm. Style 0.8--1.2 cm; stigma pubescent. Capsules ellipsoid to ovoid, 10--14 X 6--8 mm, smooth, glabrous. Seeds elliptic to reniform, ca. 5.5 mm in diam., central part hairy, winged all around. Fl. May-Nov.
A climber or twining plant. It is 12 m long. The leaf stalk is 6-12 mm long. The leaf blade is oval and 5-12 cm long by 2-6 cm wide. The base of the leaf circles the branch. The flower is yellow to orange with red spots. They occur at the tips of the branches in groups of 3. The fruit is a capsule 1-1.4 cm long by 6-8 mm wide. The seeds are kidney shaped and about 5.5 mm long.
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