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Shrubs, glabrous. Leaves opposite on mature branches and alternate on juvenile branches, obtusely serrate. Inflorescences axillary, cymose. Flowers bisexual, 5-merous. Disk thin, cupuliform, weakly 5-lobed, intrastaminal; anthers longitudinally dehiscent, introrse. Ovary 3-locular; ovules erect, 2 per locule. Capsule cylindric, bony, loculicidally dehiscent. Seeds 1-3, with membranous, basal wing.
Leaves opposite on flowering shoots, alternate on vegetative ones, petiolate; stipules free or ± united interpetiolarly, rapidly caducous.
Ovary superior, sessile, 3-locular (sometimes incompletely so), with 2 erect collateral ovules per loculus; styles and stigmas 3, free.
Stamens 5, with filaments united with base of disk; anthers basifixed, with separate thecae dehiscing longitudinally; pollen simple.
Inflorescence pedunculate, cymose, regularly dichasial, simple, axillary; bracts persistent.
Seeds 1–3, with a wing developed below the point of attachment.
Disk intra-staminal, single, concave, thin, shallowly 5-lobed.
Fruit capsular, dehiscing loculicidally in 3 valves.
Petals 5, white or greenish, imbricate in bud.
Trees or shrubs, without latex, glabrous.
Sepals 5, imbricate, united at the base.
Flowers bisexual, pedicellate.
