1、 Bark difference

Eupatorium adenophorum belongs to deciduous small or large trees, with a height of 4-10 meters and a maximum length of 15 meters. The bark is purple grayish brown. Lilac is a shrub or small tree, about 5 meters high, and the bark is grayish brown or gray

2、 Difference between blades

The leaves of Eupatorium adenophorum are broadly ovate, ovate to elliptic ovate or oblong lanceolate. The apex is short, and the tail tip is pointed to the tail shape. The base is oblong or wedge-shaped. The color above is yellow green and the color below is light yellow green. The leaves of lilac are leathery or thick paper, oval to kidney shaped, short convex and pointed to long pointed at the apex, heart-shaped at the base, close to round, dark green above and light green below

3、 The difference between flowers

The Corolla is white, radial, and the lobes are oval. The color of lilac corolla is purple, and the lobes are oval, oval to inverted oval

4、 Fruit difference

The fruit of Syringa oblongata is long and oval, with smooth surface or small lenticels. The fruiting period is from August to October. The fruit of lilac is inverted oval or oval to long oval, and the surface is very smooth. The fruiting period is from June to October