Leaves: petiole 1-2 cm long, glabrous or sparsely puberulent; blade papery, elliptic to obovate, 5.5-24.5 by 2-13 cm, 1.5-2.6 times as long as wide, apex acuminate, base cuneate, older leaves sparsely pubescent on underside of veins. Inflorescence lax, 10-17 cm long, c. 8-flowered; peduncle 3-10 cm long; pedicels 1.5-4 cm long. Sepals leafy, elliptic, 9-20(-30) by 2-6(-10) mm, 2-4.5 times as long as wide, apex acuminate, tomentose. Corolla white and pale yellow or green; tube (2-)3-4.6(-5) cm long, lower part of tube 5-10 mm long; lobes 1.7-3 cm long, apex rounded to acuminate; tomentose outside and on lobes inside, inside of tube glabrous. Stamens inserted at 1-1.5(-2) cm from corolla base; filaments 1.5-2.7 cm long, glabrous; anthers 10-13 by 1.9-3 mm. Disk glabrous or very sparsely pubescent. Ovaries densely pubescent, 0.5-2 mm long; style and style head 2.5-3.4 cm long, very sparsely pubescent. Fruit a solitary follicle, oblong/ellipsoid, apex rounded, base cordate, 10-26 by 3-7 cm. Seeds ellipsoid; flattened; (10-)14-20 by (2-)3.5-7 mm; coma (1.5-)2-5 cm.
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