Evergreen shrub, up to 2 m. Leaves 4-10 x 3-5 cm, elliptic or elliptic-oblong, glabrous, acuminate, entire; petiole c. 2-3 mm long; interpetiolar stipules fused to form a sheath, acute. Flowers terminal and solitary, white or creamy white, fragrant, 4-5 cm across. Pedicel 6-8 mm, long winged. Calyx-tube winged, 7-8 mm long, 6-lobed, persistent. Corolla-tube 2-3.5 cm long, glabrous; 6-lobed, lobes 2-2.5 cm long, fleshy, waxy. Stamens 6, exserted. Fruit 2.5-4 x 1.25-2 cm, ovoid or elliptic, winged in six ridges.