Are Robinia pseudoacacia and Sophora japonica a kind of tree?

Are Robinia pseudoacacia and Sophora japonica the same tree?

Robinia pseudoacacia and Sophora japonica are not the same tree, which can be distinguished from the following points.

1. flowering period: the flowering period of Sophora japonica is July-August every year, while that of Robinia pseudoacacia is April-May in spring and summer, so we can distinguish Sophora japonica from Sophora japonica according to the flowering period.

2. Leaf shape: Sophora japonica is an oval leaf with a sharp tip, while Robinia pseudoacacia is an oval leaf with a round or slightly concave tip, which can be distinguished from Sophora japonica according to its leaf shape.

3. Fruit: The fruit of Sophora japonica is a rosary pod, while the fruit of Robinia pseudoacacia is a flat English fruit, so it can also be distinguished from Sophora japonica according to its shape.

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Robinia pseudoacacia characteristics

1, Sophora japonica is a deciduous tree with a height of 10 ~ 25m. Its bark is grayish brown, its twigs are grayish brown, it has hair when it is young, and it has no hair and stipules when it is adult.

2. Robinia pseudoacacia leaflets are often opposite, ovoid or ovoid, with round front end, slightly concave, small top end, round to wide wedge-shaped base, whole edge, green top and gray-green bottom, pubescent when young, and hairless after.

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Characteristics of Sophora japonica

1, Sophora japonica is a tree with a height of 25 meters. Its bark is grayish brown with longitudinal cracks. When young, its branches are green and hairless, and its leaves are pinnately compound. At first, the leaf axis is soft, and the petiole base that falls off immediately after rotation expands, and the shape of the leaves around the bud changes, sometimes oval, leaf-shaped, linear or subulate, and falls off early.

2. There are 4-7 pairs of lobules of Sophora japonica, which are nearly alternate, ovate-lanceolate or oval-oblong, with sharp front end, small top end, round or wide wedge-shaped base and grayish white lower part.

Schematic diagram of the difference between Sophora japonica and Robinia pseudoacacia

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