Introduction of Liao Da Qing Ye:Indigoplant Leaf or Folium Polygoni Tinctorii.

TCM Herbalism:Medicinals and Classifications. ✵The article gives records of the herb Indigoplant Leaf, its English name, Latin name, property and flavor, its botanical source one plant species, ①.Polygonum tinctorium Ait., 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 Indigoplant Leaf, its pharmacological actions, medicinal efficacy, and administration guide.

Folium Polygoni Tinctorii(Indigoplant Leaf).

dried herb pieces of Folium Polygoni Tinctorii Pin Yin Name: Liǎo Dà Qīnɡ Yè.
 English Name: Indigoplant Leaf.
 Latin Name: Folium Polygoni Tinctorii.
 Property and flavor: warm, pungent, sweet.

 Brief introduction: The herb Folium Polygoni Tinctorii is the dried leaf of Polygonum tinctorium Ait., used as dyers woad leaf with stronger effects. The herb is commonly known as Folium Polygoni Tinctorii, Indigoplant Leaf, Liǎo Dà Qīnɡ Yè.

 Botanical source: The herb Folium Polygoni Tinctorii (Indigoplant Leaf) is the dried leaf of (1). Polygonum tinctorium Ait., it is a plant of the Polygonum L. genus, the Polygonaceae family (smartweed or buckwheat family) of the Polygonales order. This commonly used species is introduced:

(1).Polygonum tinctorium Ait.

 a flowering plant of Polygonum tinctorium Ait grows near a river with pink flower spikes Botanical description: Polygonum tinctorium Ait is commonly known as Liǎo Lán. Annual herbs, the plant grows up to 50~80 cm high. Stem is upright, cylindrical, usually branched or not branched, glabrous, with conspicuous nodes; simple leaves are alternate; petioles are 5~10 mm long; the base has sheath-shaped membraneous stipule (peraphyllum), hazel (pale brown), the front tip is truncate, the edge has long cilia; leaf blades are oval (egg-shaped) or ovate-lanceolate, 3~8 cm long, 1.5~5.5 cm wide, the apex is blunt, the base is circular or cuneate, entire, with marginal seta (tricholoma), both surfaces are cyan (blue-green) when it is dried.

 flowering plants of Polygonum tinctorium Ait grow in field with many reddish pink flower spikes and green leaves Spica is terminal or axillary, arranged densely; flower bracts are campanulate (bell-shaped), almost herbaceous (grasslike), with cilia; flowers are small, red, perianth is 5-lobed, perianth lobes are ovate, rosiness (faint red); 6~8 stamens, shorter than perianth; 1 pistil, 3 styles, style is not stretching out, stigma is trifurcated.

 Achenes are ellipsoid trigonous or lenticular, brown, glossy, and wrapped in a persistent perianth. Its flowering period is from July to September, and the fruiting period is from August to October.

 Ecological environment: Polygonum tinctorium Ait grows in the weald and along ditch banks, mostly cultivated or in a seminatural state. The plant is distributed in China, and also in Europe. The plant is cultivated or grows in a semi-wild state in the north and south areas of China, the plant is distributed naturally in the north and northwest areas of China and other areas.

 several seedlings of Polygonum tinctorium Ait grow in a field,with green leaves and reddish stems Growth characteristics: Polygonum tinctorium Ait likes warm and humid climates, and its soil requirements are not strict, like good drainage, humus-rich loam, clay loam, and sandy loam, clay soil takes second place, sandy soil and gravel soil are not suitable for the growth of Polygonum tinctorium Ait, the plant grows poorly in arid soil.

 Characters of herbs: The leaves are mostly shriveled or broken, cyan (blue-green) or picine (blue-black), main vein is khaki to pale yellowish-brown. After flattening completely, the intact leaves are elliptic, 3~10 cm long, and 2~5 cm wide, the apex is blunt, the base is attenuate (gradually narrowing), entire, leaf veins are somewhat protuberant on the undersurface, lateral veins are conspicuous, its color is light; petioles are flat or oblate, about 1 cm long, with a membranous stipular sheath (ocrea). The texture of the herb is crisp and fragile. The herb has a faint or weak odor, and it tastes mild and slightly bitter. The herb of a better grade is dry, with thick leaves, cyan (blue-green), and no branches and stalks.

 Pharmacological actions: ①.Inhibition on pathogenic microorganisms, ②.antipyretic action, ③.anti-inflammatory and immunological effects, ④.effects on cardiovascular function, ⑤.anti-platelet aggregation, ⑥.effect on smooth muscle.

 Medicinal efficacy: Clear heat and detoxify, cool blood and eliminate spots. It is indicated for fever of warm disease, macula and rash, hematemesis and epistaxis, pulmonary heat and asthma cough, pharyngitis, mumps, heat dysentery, jaundice, erysipelas, canker(mouth sores), carbuncles on superficies, etc.

 Administration of Folium Polygoni Tinctorii (Liǎo Dà Qīnɡ Yè): 
Reference: Administration Guide of Folium Polygoni Tinctorii (Liǎo Dà Qīnɡ Yè)
TCM Books: ①.Internally:9~15 grams.Externally:fresh herbs proper amount, mashed and apply stick at affected area; ②.Internally:water decoction, 9~15 grams, fresh herb 15~30 grams, or extract juice and drink.Externally:proper amount, mashed and apply stick, or mashed and smear.




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  • 1.Introduction of Liao Da Qing Ye:Indigoplant Leaf or Folium Polygoni Tinctorii.

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