Laoguyan is also known as Daughter Tea, Smelly Plum, Ussuri Rhamnus, big green, brainy, red-skinned and green trees. It is the fruit of Rhamnaceae plant Rhamnus dauricus. Bark and leaves are used as medicine. Picking tea and bark in spring, frying the tea, scraping the rough skin off the bark and decocting the paste.

The crow's eye is as high as 10m, and the branchlets are stout, nearly opposite, brown or reddish brown, with large buds at the top without thorns, or short needles at the bifurcation. Born in hillside forests below 1800m above sea level, in shady and humid places of thickets or forest edges and ditches. Born in mixed forests, mixed forests and forest margins. It is produced in mountainous areas and semi-districts, and distributed in the northeast, Hebei and Shanxi.

Extended data

The Economic Value of Laoyan Tree

Seed oil is used to make lubricating oil. Bark and fruit contain tannin, which can be used to extract tannin extract and yellow dye. Branches and leaves as pesticides can kill soybean aphids and control rice blast. The wood is hard and can be used for vehicles, pulleys, fine carving, etc.

This species is very similar to the frozen green R. utilis Decne., but the leaves are narrow, narrow oval or narrow oblong, with long petioles, hairless on both sides or sparse short hairs only in the lower vein axils, which is not difficult to distinguish from the latter. The main difference between Rhamnus rhamnoides L. and R. davurica Pall. is that the leaves of the latter are oval or oval, and the terminal buds usually do not form thorns; However, the leaves of this species are long and narrow, and the terminal buds often become acupuncture.

Baidu Encyclopedia-Laoguyan