Trees. Leaves alternate. Conflorescence raceme-like, terminal, paniculately-branched. Flowers bisexual, zygomorphic, sessile, paired on a common peduncle; peduncle bracts and floral bracts usually absent at anthesis. Tepals valvate, reflexed at anthesis. Stamens 4; anthers 2-locular, basifixed, dehiscing by longitudinal slits. Hypogynous glands 4 (2 large, 2 smaller), ±globular. Ovary stipitate; ovules c. 10-14; pollen presenter dilated; stigmatic surface lateral, ±circular, central, mammiform. Fruit a large, woody follicle. Seeds many, ±elliptic, winged.