Climbers to 5 m tall. Branches glabrous. Petiole 5-10 mm, blackish and minutely transversely wrinkled when dried; leaf blade oblong, 4-20 × 1-5 cm, papery, abaxially yellowish, very sparsely puberulent, and reddish yellow when dry, adaxially glabrous, secondary veins 8-12[-18] on each side of midvein and adaxially flat to slightly prominent, tertiary veins inconspicuously raised, base rounded to cuneate, apex acute. Inflorescences axillary or subaxillary, sometimes ± grouped into terminal thyrses, 1-or 2-flowered; peduncle 1-3 mm; bracts minute, scalelike. Flowers fragrant. Pedicel ca. 2 cm, minutely appressed pubescent, minutely bracteolate below middle. Sepals ovate-triangular, ca. 2 mm, outside pubescent, inside glabrous. Petals yellow; outer petals ovate-triangular, ca. 2.4 × 1.4 cm, thickened, outside fulvous pubescent, inside glabrous, apex obtuse; inner petals lanceolate, 1.2-1.4 × ca. 0.6 cm, inside basally concave and apically convex. Stamens oblong; connectives 3-angular. Carpels oblong, pubescent; ovules 9-16 per carpel, in 2 series; styles cylindric, short, glabrous; stigmas apically entire. Monocarp stipes short, thick; monocarps globose to shortly cylindric, 4-5 × ca. 4 cm, pubescent to glabrescent. Seeds 9-16 per monocarp, in 2 series. Fl. Mar-Jun, fr. Jun-Dec.
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A climber. It grows 5 m long. The leaves are oblong and 4-20 cm long by 1-5 cm wide. They are yellowish underneath. The flowers are in the axils of leaves and there can be 1 or 2 flowers. They have a scent. They are yellow. The fruit are 4-5 cm long by 4 cm wide. There are 9-16 seeds.
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