Plant Pu Shu: deciduous trees, up to 20 meters high; The bark is grayish brown, smooth and unbroken, and the branches are flat. Annual branchlets have dense hairs. The leaves are thick, broadly oval or round, and the middle and upper edges are serrated; Three veins, lateral veins below six pairs, not directly to the leaf margin, the leaf surface is hairless, and the veins are sparsely pubescent along the back. The petiole is about 65438 0 cm long. The heterozygosity of flowers is the same; Male flowers cluster in the axils of the lower leaves of the branches of the current year; Female flowers are solitary in the axils of upper branches, and 1-3 flowers are clustered. Drupe subglobose, solitary leaf axils, reddish brown, 4-5 mm in diameter; Fruit stalk equal to or slightly longer than petiole; The flowering period is April, and the fruit maturity is 65438+ 10. Drupe is nearly spherical, orange-red when mature, with pits and ridges on the surface, single or two. Most of them are distributed in places where the plains are tolerant to shade; It is distributed in Huaihe River basin, south of Qinling Mountains to South China, scattered in plains and low mountainous areas, and is common near villages.

Garden use: Pu Shu has a complete and broad crown and rich shade, which is the most suitable shade tree for parks and gardens. It can also be used for planting street trees in streets and expressway. Urban residential areas, schools, factories and mines, street green spaces and rural "four sides" greening are all available, and they are also windproof and dike-fixing trees in river network areas. It can also be used as village landscape material. Pu Shu's leaves are solitary, alternate, Ye Guang-shaped, 3-9 cm long and 5 cm wide, with short and sharp tips, wedge-shaped bases and many asymmetries. There are 3 veins at the base, only the veins on the surface of the leaves are hairy, the veins on the back of the leaves are yellowish brown, the veins are arc-shaped and do not reach the leaf margin, the middle and upper parts of the leaf margin are sparsely serrated, and the petiole is 0.6- 1.0 cm long and short hair. Trees with smooth gray bark; Annual branches have dense hairs. Leaves alternate and petioles are long; Leaf blade leathery, broadly ovoid to narrowly ovoid, apex acute to acuminate, base rounded or broadly cuneate, oblique, shallowly serrated above the middle, three veins, hairless at the top, and sparse hairs along veins and axils below. Flower heterozygosity (bisexual flowers and unisexual flowers are the same plant), leaf axils of branches of the current year; Drupe is subglobose and reddish brown.

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