Deciduous trees, up to 20 cm tall. The bark is thin and there is often milk in the twigs. The single leaf is opposite, the lobe diameter is 7 cm- 15 cm, usually palmately 5-lobed, the base is often heart-shaped, the lobe is ovoid, entire, both sides are hairless or there are tufts of hairs only in the axils of lower leaves. Flowers mixed, corymb terminal. The fruit is flat, the wings of the fruit are spread at a pure angle, and the wings are twice as long as nuts. The flowering period is April-May, and the fruiting period is 9-65438+1October. Mainly produced in the Yangtze River basin, southwest, north China, southeast, west to Sichuan, with Shaanxi being the most widely distributed.

2. Castanea henryi (Acer truncatum)

Small deciduous trees, 7 cm -8 cm tall, umbrella-shaped or spherical, with slender branches, purple or grayish purple. Leaf blade diameter is 6 cm- 10 cm, palmately parted by 5 cm-7 cm, usually 7-parted, split, lobes oval to lanceolate, leaf margin with serrations, only tufts of hairs below the axils, mixed flowers and purplish red. The fruit is spherical, Zhang Kaicheng right angle to obtuse angle, purplish red when young, and brownish yellow when mature. Flowering in May, bearing fruit in September. Mainly distributed in East China and Central China.

3. Acer truncatum (Acer truncatum)

Deciduous trees, up to 10 m. The crown of the tree is umbrella-shaped or obovate. Leaves palmately 5-lobed, lobes entire, lobes acute. Leaf base is usually truncated. The drupe is flat, the wings of the two fruits spread at right angles, and the wings are wider, equal to or slightly longer than the nutlet. Mainly produced in north and southeast China, but also distributed in Inner Mongolia, Shaanxi, Shandong, Jiangsu and An Wei.

4. Triangle maple (maple, pineapple)

Deciduous tree, up to 20 meters high, with thin strips of bark peeling off and oval crown. Leaf apex 3-lobed or indehiscent, entire or slightly sparsely serrate. The two sides of the fruit are convex, and the two fruit wings are nearly parallel. It is produced in all parts of the Yangtze River valley and cultivated in North China, South China and Southwest China.

5. Acer ginnala

Deciduous shrubs or small trees usually have 3 (1-5) pinnate leaves, prominent middle lobes, straight or inconspicuous on both sides, irregularly serrated, pinnate veins and three bases. The fruit protrudes to both sides, with wings twice as long as the fruiting body, standing at an acute angle and overlapping inner edges. Northeast China, North China, Kucha strip subspecies, produced in the middle and lower reaches of the Yangtze River basin.

6. Acer negundo (Fraxinus mandshurica, Acer saccharum)