1、 Blade difference

Robinia pseudoacacia leaves alternate, with 7-19 leaves forming pinnate compound leaves, oval to oval oblong, about 3-6cm long, dark green and shiny. The leaves of Robinia pseudoacacia are usually opposite, oval, oval or long oval, which are smaller than the former. The apex is round or concave, with a small tip. The base is round to wide wedge-shaped, green above and grayish green below

2、 The difference between flowers

Sophora japonica is a raceme with drooping shape and red color. It can bloom 200-500 flowers at the same time and has a very strong floral fragrance. The black locust is a spike, the bracts fall early, the color is white, and the black locust flower is edible