Morphological characteristics of sour jujube

Sour jujube is also known as "spine". It is native to North China and is also distributed in central and southern provinces. How wild. They are often shrubs and some are small trees. The tree is strong. The shape of branches, leaves and flowers is similar to that of common jujube, but the internodes of branches are shorter and the stipules are well developed. except for each node of the growing branches, the stipules of the branches are also sharp and thin. The leaves are small and dense, the fruit is small, round or oval, the pericarp is thick, smooth, purplish red or purplish brown, the inside is thin, the taste is mostly sour, the core is round or oval, the nuclear surface is smooth, containing 1 or 2 seeds, full kernels can be used as traditional Chinese medicine. Its adaptability is stronger than that of common jujube and its florescence is very long, so it can be a nectar plant.