Flowers crowded, compact, on globose common bracteolate receptacles. Calyx-tubes contiguous, prismatic; limb half 5-cleft. Corolla-tube usually elongated; throat funnel-shaped, glabrous; lobes 5, short, ovate or rounded, valvate in the bud. Stamens 5, inserted on the throat of the corolla; filaments short; anthers basifixed, shortly oblong, exserted. Disk cup-shaped. Ovary 2-celled; style filiform, much exserted; stigma capitate; ovules numerous, pendulous, imbricated. Capsule septicidally dicoccous; cocci dehiscing inside. Seeds oblong, winged at both ends. —Trees or shrubs with terete branches, opposite or whorled petiolate leaves, interpetiolar ample oblong obtuse stipules, solitary or panicled pedunculate heads, and small flowers.