Trees or shrubs. Leaves alternate, pinnately compound with or without a terminal leaflet. Stipules wanting. Indument usually simple, rarely of stellate or dibrachiate hairs. Inflorescence axillary or terminal, usually thyrsoid or rarely racemose. Flowers actinomorphic, hermaphrodite or unisexual and then the rudiments of the opposite sex well differentiated in the unisexual flowers. Calyx of 4—5 sepals, usually lobed or less frequently truncate or with the sepals free. Petals (3—) 4—5 (—7), imbricate or valvate, free or partly united. Stamens 5—10; filaments partly or completely united into a staminal tube or rarely free; with or without appendages; anthers 2-celled, inserted on the top of the filament or on the margin of the staminal tube,...