What are the identification methods for the Chinese medicinal herb Schisandra chinensis?

Schisandra is divided into Liao Schisandra and Shan Schisandra, both traditional Chinese medicinal herbs with a long history of use. In recent years they have sold very well, especially last year when Korean pharmaceutical traders came to China to purchase large quantities of Liao Schisandra, causing the price to soar to around 70 yuan. As the price of the medicinal herb rose, unscrupulous traders tried every means to adulterate and counterfeit it. When the price of Liao Schisandra was high, they mixed Shan Schisandra into @#@136@#@. Now the prices of Liao Schisandra and Shan Schisandra are similar, and both remain high, so they have mixed in the seeds of a wild type of cultivated mountain grape. To improve everyone's identification ability, the key identification points we have mastered are listed below for reference. Liao Schisandra: also called Bei Schisandra, it is irregularly round-spherical, 5-8 mm in diameter, with a purplish-red surface; older stock has a dull, brownish color, shriveled but soft and moist flesh, and a fairly strong sour taste when chewed. Inside are 2 yellow kidney-shaped seeds, occasionally 1 seed, with a glossy seed coat that gives off a fragrant aroma when crushed, and a pungent, bitter taste. Shan Schisandra: also called Xi Schisandra or Nan Schisandra, it is irregularly round-spherical, 3-5 mm in diameter, slightly smaller than Liao Schisandra, less red in color than Liao Schisandra, mostly brownish-red when dried, with thinner flesh than Liao Schisandra, containing 1-2 kidney-shaped seeds, with a slightly sour, pungent and bitter taste. Mountain grape is extremely similar in appearance to Shan Schisandra, but the fruit is light and puffy, the outer skin easily crushed when pinched, not shriveled, and odorless, containing several round seeds; after cutting the seeds open, the seed core is dark brown, whereas the seed of genuine Shan Schisandra is kidney-shaped and after cutting open the seed core flesh is white. This is the most obvious difference for distinguishing Schisandra from mountain grape. In addition, the flesh of Schisandra is not easily separated from the seed; the seed adheres to the fruit skin, and the flesh tightly wraps the seed, while the fruit skin is soft and, when lightly rolled by hand, has a tough resilience. Mountain grape fruit skin, however, is dry and relatively thin, not closely attached to the seed, and when lightly rolled by hand the skin breaks and the seed comes out. Besides mountain grape, some unscrupulous traders mix small amounts of red adzuki beans, small lentils and broken twigs into Schisandra to achieve the purpose of increasing weight. With careful identification, these are not hard to spot. All medicinal materials units and the broad community of pharmaceutical traders are requested to pay attention to identification.