A long time ago, there was a legend in China that "Shen Nong tasted hundreds of herbs, encountered seventy-two poisons every day, and drank tea to cure them." It is said that Shen Nong had a crystal-clear belly, and people could clearly see whatever he ate from his gastrointestinal tract. At that time, people ate everything alive, so they often fell ill. In order to relieve people's suffering, Shen Nong tried all the plants he saw to see the changes in the plants in his stomach and judge which ones were non-toxic and which ones were poisonous. When he tasted the young leaves of an evergreen tree with white flowers, they flowed and washed everywhere in his stomach from top to bottom and from bottom to top, as if checking something in his stomach, so he called this green leaf "check". Later, people called "cha" "tea". Shennong spent many years climbing mountains and wading in rivers, trying various herbs, and was poisoned several times a day. He relied on tea to save him. But the last time, Shen Nong had no time to eat the tea and was poisoned by poisonous weeds. It is said that at that time he saw a grass with small yellow flowers, and the calyx was opening and closing. He was curious, so he put the leaves in his mouth and chewed them slowly. After a while, he felt uncomfortable in his stomach. Before he had time to drink the tea, his intestines were broken off section by section. It turned out that he was poisoned by the poison of gallbladder. In order to respect and commemorate the achievements of the inventors of agriculture and medicine, later generations have passed down this story from generation to generation.

Do you think there will be historical data at that time? Moreover, Shennong is just a legend. He probably said before his death: "This grass...is...is...poisonous^"