The two trees differ in height, leaves, flowers and fruits.

1. Different heights: The sapindus tree is a tall tree that can grow to more than 20 meters, while the height of the Luan tree is not as high as the former, and generally can only grow to 7-13 meters high. .

2. Different leaves: The leaves of the Sapindus tree and the Luan tree are obviously different. The Sapindus tree has pinnate compound leaves, the petiole is about 25 cm long, and the leaf shape is oblong-lanceolate or sickle-shaped. ; The leaves of Luan tree are bipinnately compound leaves, without petioles, and the leaf shape is ovate-lanceolate.

3. The flowers are different: the flowers of soapberry are in panicles, and the flowers are very small; the flowers of leucophylla are in cymes panicles, with many branches, and the calyx is lanceolate.

4. The fruits are different: the fruits of soapberry are spherical, brown when young, yellow or brown when mature, and the seeds are black; the fruits of Luan tree are conical, with a slightly pointed top. The fruit is red and contains brown granular seeds.