Branchlets lenticellate, glabrous. Leaves: petiole 0.6-2.5 cm long; blade elliptic, obovate or oblong, 4.7-21 by 2.3-10.2 cm, 1.9-3.5 times as long as wide, apex acuminate to rounded or apiculate, base acute to rounded, 12-22 pairs of straight secondary veins at an angle of c. 80°, forming a looped intramarginal vein, tertiary venation of strong intercalcated veins and then laxly reticulate, glabrous. Inflorescence 9-15 cm long, peduncle 1.7-3.9 cm long, glabrous. Sepals ovate, deciduous, 6.4-11 by 2.2-5 mm, 1.5-3 times as long as wide, apex acuminate, glabrous. Corolla white; tube 2.5-5.2 cm long; lobes 2-4.4 by 1-4.5 cm; glabrous outside, pubescent in tube above anthers and on the insertion of the stamens to the corolla. Stamens inserted at 14-19 mm from corolla base which is 0.4-0.5 of corolla length; anthers pubescent on the back, 9.2-9.8 by 1.6-2 mm. Disk c. 0.6 mm high. Ovaries c. 1.2 mm long; style 18-21.5 mm long, style head 2.9-3.3 mm long. Fruit 15.8-20.6 by 1.7-2.9 cm. Seeds 28-56 by 4.6-12 mm.
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