Small-leaved maple (lat. Acer mono) is a species of tree in the genus Maple (Acer) of the Sapindaceae family. It grows naturally in Japan, Korea, China, Mongolia, the Russian far East and Sakhalin. Deciduous tree 15-20 (up to 24) m high, pyramidal prostrate crown. The bark is smooth, yellow-gray from the second year. The buds are dark red in winter. Leaves with five or seven lobes, 8-15 cm wide, green on both sides, cut weakly or up to the middle, the edges are even; the underside is not pubescent or with soft hairs on the main vessels. The blades are triangular and evenly pointed. Petioles are long. Autumn coloring from yellow to red. The flowers are yellow, on pedicels 4-6 cm, collected in a brush, appear simultaneously or before the leaves. Usually there are only male or female flowers on one tree. The fruit is a paired lionfish, the wing is elongated 1-1. 5 cm wide and 3-3.5 cm long, including a flat nut 1-1. 3 cm long and 8-10 mm wide. The wings are located in the winglet at various angles. Blooms in April-may, bears fruit in September. Winter-hardy, shade-tolerant, prefers fresh drained soil, wind-resistant. Relatively hardy in the city. It tolerates transplants well. In the first 3 years, it grows slowly. Blooms and bears fruit from the age of 11. Yields of seed reproduction. Seedlings need shelter for the winter, their winter hardiness is lower than adult plants. Recommended for alleyways, single and group plantings, creating edges and mixed stands of forest parks. Effectively reduces the noise of the city. In the culture since 1861. Small-leaved maple is endowed with very valuable healing properties, while for medicinal purposes it is recommended to use the bark and leaves of this plant. Small-leaved maple bark is recommended as a very valuable astringent. As for the leaves of this plant, they should be used as a wound healing agent.