Deciduous trees. Leaves 2-pinnate, with many leaflets. Flowers in terminal or axillary panicles, showy, blue to violet. Calyx 5-toothed. Corolla campanulate, 2-lipped, 5-lobed; lobes subequal, spreading, obtuse. Stamens 4; staminode present. Capsule suborbicular, compressed, dehiscing by 2 woody valves. Seeds winged.