Deciduous trees The crown is tall, with a height of 12 ~ 15 meters, and the highest can reach 20 meters. The secondary pinnate compound leaves are opposite, with large leaves and usually more than 15 pairs of feathers. Each pinna has 10 ~ 24 pairs of leaflets, which are pinnate and densely planted. Leaflets are oblong, about 65438 0 cm long, entire, with acute apex and slightly puberulent. Panicle terminal or axillary, bell-shaped, corolla 2-lipped, 5 cm long, blue-purple, with two strong stamens.