Introduction of Da Qing Ye:Dyers Woad Leaf or Folium Isatidis.

TCM Herbalism:Medicinals and Classifications. ✵The article gives records of the herb Dyers Woad Leaf, its English name, Latin name, property and flavor, its botanical source one plant species, ①.Isatis tinctoria L., with a detailed introduction to the botanical features of this plant species, the growth characteristics, and ecological environment of this plant species, the features of the herb Dyers Woad Leaf, its pharmacological actions, medicinal efficacy, and administration guide.

Folium Isatidis(Dyers Woad Leaf).

Isatis tinctoria L.:growing shrub Pin Yin Name: Dà Qīnɡ Yè.
 English Name: Dyers Woad Leaf.
 Latin Name: Folium Isatidis.
 Property and flavor: cold, bitter.

 Brief introduction: The herb Folium Isatidis is the dried leaf of Isatis indigotica Fort.(family Cruciferae), used to clear heat, counteract toxins and cool the blood for treating warm diseases at the nutrient and blood stages with eruption, and also for mumps, painful swollen throat and erysipelas. The herb is commonly known as Folium Isatidis, Dyers Woad Leaf, Dà Qīnɡ Yè.

 Botanical source: The herb Folium Isatidis(Dyers Woad Leaf) is the dried leaf of (1). Isatis indigotica Fort., it is a plant of the Isatis genus, the Brassicaceae family of the Brassicales order. This commonly used species is introduced as:

(1).Isatis tinctoria L.

 Isatis tinctoria L.:growing plants Botanical description: The Isatis tinctoria L. is a plant of the Cruciferae family and Isatis genus, commonly known as "Song Lan", biennial herb. Main root deep, diameter 5~8 mm, skin gray-yellow. Stem erect, high 40~90 cm. Leaves alternate; basal leaves larger, with handles, leaves oblong-elliptic; cauline leaves oblong to oblong-oblanceolate, lower leaves larger, gradually smaller, 3.5~11 cm long, 0.5~3 cm wide, apex obtuse, base arrow-shaped, semi-bivalve, entire or not obvious serrated. Calyx racemes: flowers small, 3~4 mm in diam., Adaxially, slender; calyx 4, green; petals 4, yellow, obovate; 6 stamens, 4 strong; 1 pistil, oblong. Siliques oblong, winged, with midrib. 1 seed. It is flowering in May, fruiting in June.

 Isatis indigotica Fort.:growing plants The Isatis indigotica Fort., is a plant of the Cruciferae family and Isatis genus, commonly known as "Cao Da Qing", it has small differences from the Isatis tinctoria L. the difference is that the leaf base of this species is auriculae, obtuse and concave top fruit, or full truncated. Flowering in May. Fruit in June.

 Ecological environment: The plant grows in the field water edge, mostly for cultivation. The plant mainly distributes in the Yangtze River area, the Zhujiang river area, northwest, southwest, and other areas of China.

 Dyers Woad Leaf:herb photo Characters of herbs: Leaves are wrinkled, curled and broken. After flattening, the intact leaves are oblong to oblong oblanceolate, with a length of 4~16 cm or 5~20 cm, width of 1~4 cm or 2~6 cm. The apex is blunt or rounded, and the base is tapered and descends into a winglike petiole. The whole edge is microwave-shaped, the upper and lower surfaces are grayish green or brown green, and some dark and slightly protruding dots can be seen, hairless, feathery reticulated veins, the main veins protruding from the lower surface, and the petioles narrow down to winglike shape, 4~10 cm long and light brown yellow. The texture of the herb is crisp. The herb has a slight taste, it tastes slightly sour, slightly bitter and puckery. The herb which has large leaves and green color is better.

 Pharmacological actions: ①.antibacterial effect, decoction in the test tube has a bactericidal effect on a variety of dysentery bacilli, also has a killing effect to meningococcus. It also has a killing effect on the leptospira bemona group, jaundice hemorrhagic group Walden type, and seven-day fever type. The tryptamine ketone contained in the herb has a strong antibacterial effect on the tinea pedis bacteria. It is particularly effective against bacilli and dermatophytes. ②.Anticancer effect, ③.antipyretic effect, ④.choleretic effect, ⑤.anti-inflammatory effect, ⑥.effect on the immune system, ⑦.the effect on the heart and vascular system, ⑧.effect on smooth muscle, ⑨.effect on platelet aggregation.

 Medicinal efficacy: Clear heat, detoxify, cool blood, stop bleeding, eliminate spots. It is indicated for warm pathogen attacking the Ying system, warm disease excessive heat and polydipsia, hyperpyrexia and coma, macula and papula, exanthesis, jaundice, diarrhea and dysentery, heat dysentery, bacillary dysentery, mumps, pharyngitis, erysipelas, carbuncle swelling, influenza, acute infectious hepatitis, acute gastroenteritis, acute pneumonia, hematemesis(spitting blood), epistaxis(nose bleeding), canker, carbuncle sore swelling poison, etc.  

 Administration of Folium Isatidis(Dà Qīnɡ Yè): 
Reference: Administration Guide of Folium Isatidis(Dà Qīnɡ Yè)
TCM Books: ①.Internally:9~15 grams;②.Internally:water decoction, 3~5 qian(about 9~15 grams),fresh herb 1~2 liang(about 30~60 grams),or extract juice.Externally:mashed and apply stick or wash with water decoction;③.Internally:water decoction, 10~15 grams, fresh herb 30~60 grams, or extract juice and take.Externally:mashed and apply stick, or wash with water decoction.

Herbs Clearing Heat and Counteracting Toxins.

 Introduction: Herbs Clearing Heat and Counteracting Toxins: an agent or substance herbs that counteracts heat toxins or fire toxins, mainly indicated in the treatment of boils, sores, abscess, erysipelas, epidemic infectious diseases, mumps, dysentery, insect or snake bite, and burns.
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