Evergreen tree. Twigs thick, hard, lenticellate, nodes with pitted glands, inter-nodes flattened. Leaves 1-pinnate; leaflets without domatia. Racemes ox panicles terminal or from the twigs, hairy and with numerous capitate-glandular hairs. Thyrses terminal, sometimes reduced to short-racemiform. Flowers large, not articulated with the pedicels. Pedicels bracteolate, often with abortive flowers in the axil. Calyx halfway split, valvately 5-lobed already in bud, thin, veined. Corolla campanulate, hardly zygomorphic, without basal tube, glabrous, glandular-punctate; lobes 5, imbricate in bud, rounded, entire. Stamens 4 and a staminode, inserted in the hairy throat. Ovary 4-sulcate, each cell with 2 placentas on the septum, ovules very many, in many rows; stigma with 2 oblong-spathulate lips. Capsule (immature, 4½ cm long) linear, shortly beaked, oval in CS with a flat septum on which developed winged ovules; pericarp with 2 fine grooves in the middle of the valves and obviously the capsule loculicid.
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