Unona latifolia Dunal, Monogr. Anonac. 115. 1817; Melodorum latifolium (Dunal) J. D. Hooker & Thomson.

Climbers to 5 m tall. Branches tawny pubescent when young, glabrescent. Petiole 1-1.5 cm, robust, abaxially grooved, tawny pubescent; leaf blade oblong, oblong-elliptic, or obovate, 13-35 × 5-15 cm, papery, abaxially tawny pubescent and more densely so on veins, adaxially puberulent, secondary veins 18-22 on each side of midvein, at ca. 45° to midvein, anastomosing before margin, and adaxially impressed, reticulate veins dense and nearly at 90° to secondary veins, base rounded, apex acute. Inflorescences leaf-opposed, panicles borne on apical branches, to 20 cm, densely tawny pubescent; peduncle 1.5-1.8 cm; bracts broadly ovate, 3-4 × 3-4 mm, abaxially densely tawny pubescent. Pedicel ca. 2 cm, bracteolate at middle. Flower buds ovoid, recurved. Sepals broadly ovate, 5-6 × 5-6 mm, outside densely tawny pubescent. Outer petals outside reddish and basally orange, inside orangish red, ovate, 1.6-2.2 × 1.1-1.5 cm, thickened, outside brown pubescent, inside glabrous; inner petals ovate, 1.2-1.5 × 0.6-0.8 cm, glabrous. Stamens oblong, ca. 2.5 mm; connectives ovoid, apex obtuse. Carpels oblong, densely villous; ovules 8 per carpel; stigmas pubescent. Monocarp stipes ca. 3 cm, pubescent; monocarps globose, ca. 2 cm in diam., densely brown pubescent. Seeds 4-8 per monocarp. Fl. Mar-Nov, fr. Jun-Jan.

Forested slopes; 500-1200 m. S Yunnan [India, Indonesia, Malaysia, Philippines, Thailand, Vietnam].