Trees evergreen, of main canopy or understory, white resinous. Stipules caducous, small; leaf blade thinly leathery; lateral veins pinnate; tertiary veins scalariform (in Chinese species) [or subreticulate], margin entire. Flowers sessile or shortly pedicellate, in lax panicles of unilateral racemes; bracts early caducuous, linear. Calyx segments imbricate. Exposed parts of petals usually pubescent in bud. Stamens (10-)15, slightly connate and adnate to petals; anthers ovoid, small, subequal; connectival appendages aristate or filiform. Ovary ovoid, with prominent filiform style, or hourglass-shaped, with short tapering style. Fruit ovoid or globose; pericarp usually thin, waxy; 1-seeded, closely surrounded by thickened base of calyx segments; 2 fruit sepals winglike, linear, or all orbicular or ovate, subequal.