What is Bai Wei?
Bai Wei is also known as Wei Cao, Zhi Wei Lao, Lao Gua Liao Root, Shan Yan Zi, Bai Dang Cao, Bai Ma Wei, Bai Qian, Lao Jun Shu, Latin name:
Cynanchum atratum Bunge. It is an erect perennial herb of the
genus Lauraceae, Gooseberry, with beard-like roots and fragrant. Leaves ovate or ovate-oblong, apically acuminate or acute, base rounded, both surfaces covered with white tomentum, especially on the leaf abaxially and densely on the veins; umbrella-shaped cymes, without involucral pedicels, borne around the stem, flowers dark purple, calyx outside with tomentum, corolla rotate, outside with pubescence and ciliate; lobes peltate, rounded, as long as the gynostegium, anthers apically with a rounded diaphragm; oblong swollen; stigma flattened. Follicles solitary, acuminate toward tip, base obtuse, middle dilated, seeds flattened; seed hairs white, flowering Apr-Aug, fr. The roots and some rhizomes are used for medicinal purposes and have the effect of removing false annoyance, clearing heat and dispersing swelling, producing muscle, and relieving pain.
Morphological characteristics of Bai Wei
Bai Wei is an erect perennial herb, up to 50 cm tall; its roots are bearded and fragrant. Leaves ovate or ovate-oblong, 5-8 cm long, 3-4 cm wide, apically acuminate or acute, base rounded, both surfaces covered with white tomentum, especially dense on the abaxial surface and on the veins; lateral veins 6-7 pairs. Umbrella-shaped cymes, without involucral pedicels, borne around the stem, bearing 8-10 flowers; flowers dark purple, ca. 10 mm in diameter; calyx outside with tomentum, inner face with 5 small glands at the base; corolla rotate, outside pubescent and ciliate; corona 5-lobed, lobes peltate, rounded, as long as the gynostegium, anthers with a rounded diaphragm at the tip; pollinia 1 per locule, pendulous, oblong and swollen; stigma flattened.
Follicles solitary, acuminate toward the tip, base obtuse, middle dilated, 9 cm long, 5-10 mm in diam. Apr-Aug, fr.
Growth environment of Bai Wei
Baiwei is suitable for grass, grass slope, arid land, arid wasteland, thicket, coast beach, rivers, forest edge roadside, forest, forest meadows, valleys, valley and streamside forest, hillside, hillside grass, hillside sparse forest, sparse forest, streamside, suitable for mild and humid climate. A sandy loam or loam with good drainage, fertility, deep soil layer, and rich humus is desirable. It grows in the river, dry wasteland, and grass at an altitude of 100-1800 meters. It is common in mountain gullies and understory grassland.
Cultivation techniques of Bai Wei
Baiwei herb
Planting method
| Land preparation | Winter or early spring, the depth of 20-25cm; Furrow, 1.5-2m wide, 15-20cm high, furrow 30cm wide. The seedbed should be cultivated intensively and loose soil should be made into a 1-1.4m wide bed. |
| Planting | There are two methods: direct seeding and seedling rearing. The suitable sowing period is from March to mid-April. |
| Direct seeding | On demand or on schedule. Holes were opened according to plant spacing of 30cm and row spacing of 30cm. 6-8 seeds were sown at each point, and thin soil was covered after sowing. The spacing of rows was 30cm. The seeds were evenly sown in shallow trenches and covered with soil for 3-4 minutes. |
| Seedling method | Sow seeds in the early and middle of March, with row spacing of 10-12cm, evenly spread the seeds into a ditch, cover the fine soil for 2-3 points, then cover a layer of grass and wood ash, and moisten the irrigation. Seedlings can be transplanted when they are 10-12cm tall. Row spacing 30cm, plant spacing 25cm, after transplantation must be irrigated. |
Field management
The seedlings are overgrown and must be thinned. Remove small, emaciated, dense seedlings. When the seedlings grow 3-4 true leaves, the soil can be loosened and weeded, and then 3-4 times. For transplanters, the soil should be loosened and weeded 3-4 times after survival, while the soil was cultivated. Often pay attention to irrigation, especially in summer, May, and June, and should pay attention to watering, to keep the soil moist. Topdressing 1-2 times, can be used human excrement or bean cake water, both superphosphate and grass and wood ash. In addition, the remaining species should be removed from the flower stem to prevent flowering.
Disease and pest control
High temperatures and rainy season prone to root rot, should pay attention to timely drainage. In late spring and early summer, the aphid is easy to harm the plant, which can be controlled by 40% Dimethoate emulsion 1000~1500 times liquid spray.
Types of Bai Wei
Erect white myrtle, also known as three hundred, hornwort, bitter gall, sheep's tits, and perennial herbs. The plant body has white milk. Rhizome short, clustered with many slender strip roots. Stems erect leaves opposite; With a short stalk; The veins are slightly raised below. Umbel axillary, small pedicels short, flowers dark purple.
Vining white myrtle, similar to white myrtle, the difference is that the plant body does not have white milk, the upper part of the stem is wound and the lower part is erect, and the leaf texture is thinner. Flowers are small, initially yellowish-green, and the gradually purple, inner surface of corolla lobes is puberulent.
Bai Wei benefits
Bai Wei cold has the functions of clearing heat, cooling blood, and detoxifying, and it has a certain effect on heat and moving blood caused by deficiency heat. It is commonly seen in clinical low fever caused by tuberculosis. Patients often feel hot flashes and slight cheek redness in the afternoon or at night, as well as fever of hands and feet and elevated body temperature, and may even be accompanied by cough and hemoptysis. It is recommended that patients use white Wei, which can be used in combination with earth bone skin to increase the intensity of clearing deficiency heat, cooling blood, and relieving cough.
In addition, when women have hematuria or urinary tract infection, the manifestations are hot urine, urgent urine, painful urine, even soy sauce urine, and hematuria caused by kidney disease, white Wei can be used for treatment, which has certain effects of clearing deficiency heat, cooling blood and diuresis. At the same time, the use of plantain, red beans, money grass, etc., can increase the role of clearing heat and diuresis.
Bai Wei side effects
Bai Wei can enhance myocardial contractility and strengthen cardiac function. If taken internally, excessive Bai Wei can produce a strong cardio-side poisoning reaction, the poisoning amount is generally 30 ~ 40 grams. Do not overdose for clinical use. Patients with blood deficiency and no heat, Yang qi, cold food, and loose stool should be taken with caution, and patients with excessive sweating and Yang death should not take it.
a. Clearing heat and cooling blood. Bai Wei is cold and has the function of clearing heat. It can be used to treat pink eye, sore throat, gingivitis, stomatitis, etc. It can also be used to treat bleeding, hemoptysis, hematemesis, disintegrations, and other symptoms caused by blood heat.
b. Diuretic action. Once in the body, Baiwei boosts metabolism and urination. Can be used for the treatment of dysuria and edema, and can also be used for the treatment of heat, blood, drench, and other drench diseases.
c. Detoxification. Bai Wei can also be used for furuncle, scabies, poisonous snake bite, etc.
How to take Bai Wei?
a. The indications of Baiwei should be strictly controlled. It should not be used in patients with a deficient cold of the spleen and stomach and loose stool.
b. Strict control of dosage, according to the condition and individual dosing, do not use overdosage. The dosage of Bai Wei should be determined according to the disease changes and individual differences, but the maximum amount should not exceed 9 grams.
c. For patients with heart block, acute endocarditis, hypokalemia, hypercalcemia, and recent acute myocardial infarction, white mycelium should be contraindicated to prevent adverse effects on the circulatory system.
d. Incompatibility with Western medicine. Bai Wei should not be used in combination with calcium salt, because the increase in blood calcium concentration can increase the sensitivity of the heart to leukosis. It is not suitable to be combined with drugs that have the effect of preserving sodium and discharging potassium, because the drugs can cause hypokalemia, easy to cause strong cardio-side poisoning reactions.
e. If a toxic reaction occurs, the drug can be stopped immediately. Patients with mild poisoning sometimes only need to stop the drug for a few days to recover. In addition to symptomatic treatment, severe patients can also use traditional Chinese medicine detoxification, such as radix sophora 60g, decocted in water, or licorice 15g, mung bean 30g, decocted in water.
f. If long-term use of Bai Wei and its preparations is required, medication should be taken under the guidance of physicians to ensure the safety and effectiveness of medication.
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