Trees, small, or shrubs, the stems corky and fistulose, lacticiferous. Leaves spi-ral or alternate, clustered at the ends of branches, non-glandular, pinnately nerved; petiolate or subsessile, glandular or non-glandular in the axils. Inflorescences corymbose to thyrsiform, sometimes fastigiately so, the secondary peduncles mostly terminal, frequently developed, few-to many-flowered. Flowers large and showy; calyx 5-lobed, the lobes equal to subequal, usually small, without squamellae; co-rolla salverform or sometimes subinfundibuliform, thick and waxy, white to red, without appendages, 5-lobed, sinistrorsely convolute; stamens 5, wholly included, attached near the base of the corolla tube, the anthers not connivent and not ag-glutinated to the stigma, without an enlarged connective; gynoecium 2-carpellate, apocarpous, the ovary subinferior, the ovules numerous, without a nectary, the style 1, short, the stigma slenderly bicapitate, almost sessile. Fruit apocarpous, of 2 follicles, coriaceous or woody; seeds numerous, dry, flattened, winged basally, the wing large and irregular.
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Trees with copious latex. Branchlets 2-3 cm thick, nearly fleshy. Leaves alternate, long petiolate. Cymes terminal, 2-or 3branched, pedunculate; bracts usually large, deciduous before anthesis. Flowers fragrant, waxy. Calyx small, without glands. Corolla white, yellowish, pink-red, or rose-purple, funnelform; tube narrow, hairy inside, faucal scales absent; lobes overlapping to left. Stamens inserted at or near base of corolla tube; anthers free from pistil head, oblong, rounded at base; disc absent. Ovaries 2, distinct; ovules numerous, multiseriate on each placenta. Style short; pistil head with obtusely 2-cleft apex. Follicles 2. Seeds many, flat proximally, with a membranous wing; endosperm fleshy; cotyledons oblong, radicle short.
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