The front is green and the back is purple. What kind of plant is it? have

This is Undaria pinnatifida, a perennial herb of Panax notoginseng in Compositae. In southern China, such as Guangdong, Guangxi, Hainan, Fujian, Yunnan, Jiangxi, Sichuan, Taiwan Province and other rural areas, it is cultivated sporadically, mostly for medicinal or vegetable purposes. Undaria pinnatifida originated in China. According to the National Collection of Chinese Herbal Medicines, Undaria pinnatifida has the efficacy of treating hemoptysis, bloody collapse, menstrual pain, insufficient blood gas's disease, bronchitis, pelvic inflammatory disease, heatstroke, dysentery in Aba, trauma and hemostasis. Tested by the Experimental Center of Fujian Academy of Agricultural Sciences, every 100g of Undaria pinnatifida contains 9 1.49 ~ 9 1.66g of water, 6.26 ~19.18g of crude protein and 22.8% of ascorbic acid. Rich in mineral nutrients, especially trace elements such as iron, copper and zinc. It also contains flavonoid glycosides, which is non-toxic, has the effects of prolonging ascorbic acid and reducing blood vessel purple scar, and has moderate resistance to malignant growth cells. Undaria pinnatifida grows vigorously, has strong resistance, and is basically free from pests and pesticides. Its tender branches and leaves are crisp and tender for cooking, with special fragrance and unique flavor of compositae plants. Folk believe that purple pain vegetable has the effect of cooling blood and dispelling deficiency fire, and it is a kind of health-care vegetable beneficial to human health.