Large trees, unarmed; buds flattened with stipules erect and pressed to each other. Raphides absent. Leaves opposite, decussate, with domatia; stipules caducous, interpetiolar, ovate to oblong, entire. Inflorescences axillary, capitate with 1 or 2(-5) fasciculate globose heads, many flowered, pedunculate, bracteate; peduncles articulate and bracteate near top; bracteoles spatulate to spatulate-clavate. Flowers sessile, bisexual, monomorphic. Calyx limb 5-lobed. Corolla pale to dark yellow, salverform, glabrous inside; lobes 5, imbricate in bud. Stamens 5, inserted in upper part of corolla tube, partially exserted; filaments reduced; anthers basifixed. Ovary 2-celled, ovules numerous in each cell, pendulous on axile placentas attached to upper third of septum; stigma ovoid to subglobose, exserted. Fruiting heads globose, with fruit rather tightly packed. Fruit capsular, obconic to ellipsoid-oblong, septicidally then loculicidally dehiscent into 2 valves separating from base to apex and from persistent septum, cartilaginous to stiffly papery, with calyx limb persistent on persistent septum; seeds numerous, medium-sized, ovoid to fusiform, slightly flattened, shortly winged on ends.
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