Introduction of Lu Gen:Reed Rhizome or Rhizoma Phragmitis.

TCM Herbalism:Medicinals and Classifications. ✵The TCM herbalism is also known as pharmaceutics of Traditional Chinese Medicine, or Chinese pharmaceutics, is the branch of health science dealing with the preparation, dispensing, and proper utilization of Chinese herbs. It is majorly composed of Introduction of Chinese Medicinals, Classification of Chinese Herbs, Formulas, and Patent medicines.

Classifications of Herbs:Herbs Clearing Heat and Purging Fire.

 TCM Herbs Icon05 Introduction: Herbs Clearing Heat and Purging Fire: an agent or substance that has the effect of clearing heat from the Qi system, with high fever, dire thirst, dry yellow tongue coating and rapid surging pulse, or purging fire from the internal viscera, such as heart fire, liver fire, etc.

 
Rhizoma Phragmitis(Reed Rhizome).

Phragmites communis Pin Yin Name: Lú Gēn.
 English Name: Reed Rhizome.
 Latin Name: Rhizoma Phragmitis.
 Property and flavor: cold, sweet.

 Brief introduction: The herb Rhizoma Phragmitis is the fresh or dried rhizome of Phragmites communis(L.) Trin.(family Gramineae), used (1).to clear heat and promote fluid production in cases of high fever with thirst, (2).to evacuate pus for treating lung abscess, and (3).to arrest vomiting in cases of stomach heat. The herb is commonly known as Rhizoma Phragmitis, Reed Rhizome, or Lú Gēn.

 Botanical source: The herb Rhizoma Phragmitis(Reed Rhizome) is the fresh or dried rhizome of Phragmites communis Trin., it is a plant of the Phragmites Adans. Genus, the Gramineae family of the Poales order.

 Phragmites communis Common official herbal classics and Other famous herbal classics defined the herb Rhizoma Phragmitis(Reed Rhizome) as the fresh or dried rhizome of (1). Phragmites communis Trin. This commonly used species is introduced as:

 (1).Phragmites communis Trin.:
 Botanical description: It is commonly known as reed, perennial tall herb, 1~3 meters tall. Underground stem is thick, crosswalklk, hollow, there are shoots on the section. Stem erect, hollow. Leaves are in 2 rows, alternate; Leaf-sheath cylindric, leaf tongue hairy; Leaf blade flat, 15~45 cm long, 1~3.5 cm wide, margin rough. Spikes arranged into large panicles, terminal, 20~40 cm long, slightly pendulous, lower pedicel with white pilose; Spikelets usually have 4~7 flowers, 10~16 cm long; The first flower is usually male, the glume lanceolate, unequal, the first glume half or less of the second glume; Lemma longer than palea, smooth spreading; Bisexual flowers, 3 stamens, 1 pistil, 2 styles, stigma feathery. Caryopsis elliptic, separated from palea. Its flowering and fruiting period is from July to October.

 Phragmites communis Ecological environment: The plant grows in shallow water on the banks of rivers and ponds. Resource distribution: The plant distributes in most areas of China.

 Growth characteristics: The reed grows in shallow water on the banks of rivers and ponds. It prefers a warm and humid climate, cold resistance. It is advisable to select a deep soil layer and rich humus in rivers and shallow water along the bank of pond and marsh.

 Characters of herbs: fresh rhizome is long cylindrical, some slightly flat, different length, diameter 1~2 cm. The surface is yellow and white, shiny, and the skin is loose and can be peeled off. The nodes are circular with residual roots and bud marks. It is light, tough and not easily broken. The broken face is yellow-white, hollow, 1~2 mm thick, with holes arranged in a ring. No smell, sweet taste. The stems are long cylindrical compressed. The surface is shiny, yellow and white. The nodes are hard, red and yellow, with longitudinal wrinkles between the nodes. It is light and flexible. No odor, mild taste. The herb which is thick, yellow and white, shiny, no root is better.

 Pharmacological actions: The herb Rhizoma Phragmitis has an antipyretic, antiemetic effect, also can make blood sugar drop slightly, inhibit heart contraction. The component tricin it contains can relax intestinal muscles and slow down peristalsis. Besides, the root still has antibacterial, dissolving gallstones effect.

 Medicinal efficacy: Clear heat and promote the secretion of saliva or body fluid, relieving restlessness, antiemetic(preventing or arresting vomiting), diuresis, promoting eruption. It is indicated for fever and polydipsia, stomach heat and nausea, choke, regurgitation, cough with lung heat, lung abscess vomiting pus, atrophic lung disease, lung abscess, pyretic stranguria, measles. And it can be used to detoxify puffer fish poison.

 Administration of Rhizoma Phragmitis(Lú Gēn): 
 
Reference: Administration Guide of Rhizoma Phragmitis(Lú Gēn)
TCM Books: Internally:15~30 grams, fresh herb double dosage, or extract juice(CP), Internally:water decoction, 0.5~1 liang(about 15~30 grams), fresh herb 2~4 liang(about 60~120 grams), or extract juice(DCTM), Internally:water decoction, 15~30 grams, fresh herb 60~120 grams, or fresh herb extract juice. Externally:proper amount, wash with water decoction(CHMM).

 
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References:
  • 1.Introduction of Lu Gen:Reed Rhizome or Rhizoma Phragmitis.
  • 2.TCM Books:DCTM(Dictionary of the Chinese Traditional Medicine),CHMM(Chinese Herbal Materia Medica).

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