Latin literary name: Lemna minor Linn.
English name: Common Duckweed, HERBA SPIRODELAE
Family name: Lemnaceae
The fronds are symmetrical, obovate oval or nearly round, 2-5 mm long, 2-3 mm wide, with 3 inconspicuous veins, green on both sides; the root sheath has no appendages, and the root tip is blunt. The fruit is nearly gyro-shaped; the seeds have deep longitudinal veins.
The flowering period is June-July. It is widely distributed throughout the province and is a common surface floating plant in all provinces in my country.
The whole grass can be used as feed for livestock and poultry.
Source: It is the whole plant of duckweed or duckweed of the duckweed family.
Efficacy: sweating, dispelling wind, moving water, clearing away heat and detoxifying.
Indications: Treatment of hot carbuncle, opaque macules, wind-heat painful rash, skin itching, edema, amenorrhea, ringworm, erysipelas, and burns.
Meridian distribution of nature and flavor: pungent, cold. ① "Herbal Classic": "It tastes pungent and cold." ② "Bielu": "Sour, non-toxic." ③ "Southern Yunnan Materia Medica": "Cold in nature, bitter in taste." ④ "Yilin Compiled Essentials": " Pungent, flat, salty. "
Enter the lung meridian. ① "Compendium": "Enter the lung meridian." ② "Explanation of the medicinal properties of Lei Gongpao": "Enter the lungs and small intestine meridians." ③ "Compendium of Materia Medica": "Human liver and spleen."
Usage Dosage: Oral administration: decoction, 1 to 2 qian (0.5 to 1 tael freshly); pound into juice or make into pills or powder. External use: boil in water, fumigate and wash, grind into powder for withdrawal or mix and apply.
Medicine contraindications: ① "Compendium of Materia Medica": "If the superficial qi is weak and spontaneous sweating occurs, use it in a hurry." ②Ming Materia Medica Congxin: "Unless it is a serious illness or severe fever, do not try it lightly." ③"De" "With Materia Medica": "Blood deficiency, dry skin, Qi deficiency, wind pain, both are contraindicated."
Alternate names: Ping ("Erya"), water duckweed, water flower (Kaben Jing), duckweed, Algae (note by Guo Li in "Erya"), duckweed ("filling the missing elbow behind"), Shuizi, Shuisu ("Bielu"), Xiaopingzi ("Compendium on Materia Medica"), duckweed (named Materia Medica) "Illustrations"), Shuicai ("Pinhui Essence"), Shui Lian, Jiuziping ("Qunfang Pu"), Tian Ping ("Chinese Medicine Chronicles")
Prescription name: Duckweed, Duckweed
Trade name: Duckweed: also known as purple-backed duckweed. The ventral surface is light green to gray-green, and the back surface is brown-green to purple-brown. The best ones are green in color, purple in back, dry, complete, and free of impurities.
Qingping: also known as green-backed duckweed. The ventral and dorsal sides of the fronds are green. The ones that are green in color, dry, complete and free of impurities are preferred.
Distribution of animal and plant resources: distributed throughout our country.
Harvesting and storage of medicinal materials: harvest them from June to September and dry them in the sun.
Latin name: medicinal material Herba Spirodelae original plant ① Purple-backed duckweed ("Shengji Zonglu") Spirodela polyrr-hiza Schleid. ② Qingping ("Effective Prescriptions of World Medical Doctors") Lemna minor L.
Textual research: From "Tang Materia Medica" ① "Tang Materia Medica": "There are three types of water duckweeds: the big one is named Ping; there is also amaranth in the water, which is also similar and has round leaves; the small duckweed on the water is mainly Burns. "② "Compendium of Materia Medica": "Xiaopingzi is the one in the ditch..."Shen Nong's Materia Medica" says Shuiping, which should be small. "③"Compendium of Materia Medica" refers to Xiaofu. Ping is not Da Ping, and Tao Su made a mistake by labeling it Da Ping. Although Pingzhi and Ping have similar sounds, their characters are different and their shapes are also very different. There are many duckweeds everywhere in the pond and still water, and they begin to grow in spring. One leaf has many leaves, and there are tiny whiskers under the leaves, which are their roots. One whose back is all green. A kind of person whose face is green and whose back is purple and red like blood is called Ziping, which is good as medicine. Pick it in July. Purple-backed duckweed is collected in July, picked clean, spread out in the sun through a bamboo sieve, and placed in a basin of water to reflect it, and it will dry easily. "④" Materia Medica Seeking Truth": "Duckweed is also good for burning smoke to repel mosquitoes. But do not approach Qiba if you are weak. "
Identification of raw medicinal materials: Microscopic identification: Surface view of fronds: The vertical walls of the upper epidermal cells are slightly curved, the stomata are infinitive, and there are 5-7 accessory cells. The vertical walls of the lower epidermal cells are nearly straight. , no stomata. The mesophyll cells on the inner side of the upper epidermis are polygonal. Some cells contain calcium oxalate clusters with a diameter of 13-30 μm. Some cells are larger, oblong, and contain calcium oxalate needle crystal bundles. The needle crystals are 17 -100μm, near the lower epidermal cells is aerenchyma, composed of parenchyma cells with large intercellular spaces
Chemical composition of traditional Chinese medicine: Purple back duckweed contains potassium acetate and potassium chloride" and iodine, Australia and other substances ". Qingping contains a large amount of water-soluble vitamins such as vitamins B1, B2, C, etc., flavonoids such as luteolin-7-or-glucose II, 8-hydroxyl draft-8-beta-glucose II and other flavonoids and Iodine, touch and other substances. Its polysaccharide is a rich source of D-Apiose. It also contains resin, wax, graphics, nj6 chlorophyll, sugar, protein, mucus, etc.
The whole plant mainly contains orientin, luteolin-7-monoglucoside, vitex-in, apigenin-7-monoglucoside, cosmosiin, etc. , and also contains tannins and lipid compounds, including linolenic acid, palmitic acid, linoleic acid, etc. It also contains β-carotene, lutein, potassium acetate, and potassium chloride.
Chemical identification of traditional Chinese medicine: Take the acetic acid extract of this product, evaporate it to dryness, add distilled water to dissolve it, add a small amount of magnesium powder and 2 drops of concentrated hydrochloric acid, heat to boiling, and it will appear orange. (Check flavonoids)
Remarks
(1) It is used for exogenous wind-heat and measles with poor penetration. It is often used clinically with Xihe Liu, burdock, mint, etc. . It can also be taken internally or externally for wind-heat addiction rash. Duckweed can release heat and promote diuresis, so it is used for those with edema and superficial heat.