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There are many weeds in the fields, and they are basically useless, but there is a kind of grass that is very useful. It can not only relieve cough and eliminate phlegm, but also inhibit the activity of pepsin, protect gastric mucosa, and fight ulcers. The name of this grass is Pinellia ternata, also known as Diwen, Shoutian, Sheep's Eye Pinellia, Scorpion Grass, Taro Fruit, Three-Step Tiao, etc.

The functions and indications of Pinellia ternata are drying dampness and resolving phlegm, relieving adverse effects and stopping vomiting, and eliminating lumps and dispersing nodules. It is used for cough and asthma due to excessive phlegm, dizziness and palpitations caused by phlegm and fluid, dizziness caused by wind and phlegm, headache caused by phlegm, vomiting and nausea, chest and abdominal distension, and plum pit qi; it can be used externally in the raw form to treat carbuncles, swellings, and phlegm nodules.

Has unique effects on the respiratory system

1. Antitussive: The alkaloids in Pinellia can inhibit the cough center and produce an antitussive effect. Intravenous injection of decoction of raw pinellia, ginger pinellia and French pinellia has a significant antitussive effect on cough caused by injection of iodine solution into the chest cavity of cats or electrical stimulation of the superior laryngeal nerve. The antitussive effect of 0.6g/kg is close to that of 1mg/kg of codeine.

2. Expectorant: Intraperitoneal injection of Pinellia ternata decoction into rats can significantly inhibit the effect of pilocarpine on saliva secretion. Mice were gavaged with ethanol extracts of raw pinellia and clear pinellia. The phenol red method showed that the ethanol extract of clear pinellia had a certain expectorant effect, while no obvious effect was observed for raw pinellia. Research by Zou Jilong and others shows that the longer the Pinellia is stored, the stronger its expectorant effect is.

Digestive system function

1. Antiemetic and emetic: Processed Pinellia can activate the efferent activity of the vagus nerve and have an antiemetic effect, while raw Pinellia can "induce vomiting" and "stir the throat". Pinellia ternata can prolong the latency period of copper sulfate-induced vomiting in dogs or prevent vomiting, and can antagonize vomiting in dogs induced by subcutaneous injection of dehydrated morphine hydrochloride. This effect is not affected by Chuanwu.

2. Anti-ulcer effect: The decoction of Pinellia ternata in water and alcohol precipitation can reduce the secretion of gastric juice, lower the free acidity and total acidity of gastric juice, inhibit the activity of pepsin, protect the gastric mucosa, and promote the repair of the gastric mucosa. It has the effect of resisting pyloric ligation ulcer, indomethacin ulcer and stress ulcer in rats.

3. Effect on liver and gallbladder: Pinellia can promote bile secretion in rabbits, increase corticosterone in the blood of mice, enhance the induction effect of corticosterone on tyrosine aminotransferase in the liver, and increase the activity of tyrosine aminotransferase in the liver.

Pinellia tuber, in prescription, expectorant and cough relieving,

1. Banxia Xiexin Decoction (from Treatise on Febrile Diseases) is mainly used to treat symptoms of abdominal distension caused by a combination of cold and heat. 12g of Pinellia, 9g each of Scutellaria, dried ginger, and ginseng, 3g of Coptis chinensis, 12 dates, and 9g of Licorice. Take the above seven ingredients, add one dou of water, boil and take out six liters, remove the residue and boil again, take out three liters, take one liter while warm, three times a day. The prescription uses Pinellia ternata, which is pungent and warm, as the main ingredient. It can disperse lumps and eliminate abdominal distension, and it is also good at relieving nausea and vomiting.

2. Banxia Houpu Decoction (from "Golden Chamber Synopsis") is mainly used to treat plum pit qi. 12g of Pinellia, 9g of Magnolia officinalis, 12g of Poria, 9g of Ginger, and 9g of Perilla leaf. Use seven liters of water, boil and take four liters, divide into four portions and take warm, three times a day and once at night. The pinellia in the formula is bitter, pungent, warm and dry, and can resolve phlegm, dissipate nodules, reduce adverse reactions and harmonize the stomach.

3. Banxia Baizhu Tianma Decoction (Medical Insights) is mainly used to treat wind-phlegm disturbance syndrome. 9g of Pinellia, 6g each of Gastrodia elata, Poria cocos and Citrus aurantium, 15g of Atractylodes macrocephala and 3g of Licorice. Take a piece of ginger and two dates, decocted in water. The prescription uses pinellia tuber to dry out dampness and resolve phlegm, and to relieve adverse reactions and stop vomiting

There is a legend about the name of Pinellia. It is said that a long time ago, there was a girl named Baixia. When she was cutting grass in the field, she dug up the underground tuber of a plant. Because she was very hungry, she tried to put the tuber in her mouth and chew it, hoping to fill her stomach with it. Unexpectedly, she vomited after eating. She quickly chewed a piece of ginger to stop the vomiting. The vomiting stopped, and unexpectedly, even the cough that had been incurable for a long time was cured. Therefore, Bai Xia used this medicine and ginger to make soup to treat coughs for the villagers, and the effect was very good. However, the tubers of this plant are rich in pulp and need to be washed many times before use. One day, when Bai Xia was washing the medicine by the river, she accidentally slipped into the river and died. In order to commemorate her, the local people named this medicine "Baixia". Later, people discovered that Baixia was harvested in summer and autumn. As time went by, they gradually changed the name of "Baixia" to "Banxia".

Every plant has its own life and its own mission in the world. People in the world should constantly learn and improve themselves.