Introduction of Lu Gen:Reed Rhizome or Rhizoma Phragmitis.

TCM Herbalism:Medicinals and Classifications. ✵The article gives records of the herb Reed Rhizome, its English name, Latin name, property and flavor, its botanical source one plant species, ①.Phragmites communis Trin., 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 Reed Rhizome, its pharmacological actions, medicinal efficacy, and administration guide.

Rhizoma Phragmitis(Reed Rhizome).

a drawing of Phragmites communis,plant and herb with root and flower petals 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., 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 stop 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 (Poaceae, grass family) of the Poales order.

 Herbal classic book defined the herb Rhizoma Phragmitis (Reed Rhizome) as the fresh or dried rhizome of (1). Phragmites communis Trin. This commonly used species is introduced:

(1).Phragmites communis Trin.

 flowering plant of Phragmites communis with spikes and a bird Botanical description: Phragmites communis Trin is also known as Phragmites australis (Cav.) Trin., is commonly known as reed, a perennial tall herb, the plant grows up to 1~3 meters tall. The underground stem is thick, crossed, and hollow in nodes, there are shoots on the node. The stem is upright and hollow. Leaves are in 2 rows, alternate; leaf-sheath is cylindraceous, paraphyll is piliferous; leaf blades are flat, 15~45 cm long, 1~3.5 cm wide, and the margin is coarse and rough.

 Spikes are arranged and form large panicles, terminal, 20~40 cm long, slightly pendulous, lower pedicel has white pilose; spikelets usually have 4~7 flowers, 10~16 cm long; the first flower is usually male, the glume is lanceolate, unequal length, the first glume is the half-length of the second glume, or even shorter; lower palea is longer than palea, smooth explanate; flowers are hermaphroditic, three stamens, one pistil, two styles, stigma is plumelike. Caryopsis is elliptic to oblong, separated from palea. Its flowering and fruiting period is from July to October.

 Phragmites communis:plant with rhizome is dig out Ecological environment: The plant grows in shallow water on the banks of rivers and ponds. Resource distribution: The plant is distributed in most areas of China.

 Growth characteristics: Phragmites communis Trin prefers a warm and humid climate and resistant to coldness. It is better to choose a field with deep soil layers and rich in humus, shallow water in rivers, or along the banks of a pond and marsh.

 dried herb segments of reed rhizome Characters of herbs: Fresh Reed Rhizome: the fresh rhizome is long cylindrical, some are slightly flat, varying in length, 1~2 cm in diameter. The surface is yellowish-white (yellowish white), and glossy, and the outer bark is loose and peelable. Nodes are annular, with residual roots and bud marks. The herb is light, and the texture is tough, not easily broken. The fracture surface is yellowish white, and hollow, the thickness of the wall is 1~2 mm, and small holes are arranged in a ring. The herb is odorless and tastes sweet. The herb of a better grade has thick and uniform stripes, yellowish white, luster and no fibrous root.

 Dry Reed Rhizome: the dried rhizome is flattened long cylindrical. The surface is glossy and yellow white. The segment part is hard and reddish yellow, and there are vertical wrinkles between the nodes. The texture of the herb is light, pliable and tough. The herb is odorless, it tastes slight sweet. The herb of a better grade has thick and uniform stripes, yellowish white, luster and no fibrous root.

 Pharmacological actions: ①.antipyretic; ②.antiemetic effect; ③.make blood sugar drop slightly; ④.inhibit heart contraction; ⑤.antibacterial; ⑥.dissolving gallstones effect.

 Medicinal efficacy: Clear heat and promote the secretion of saliva or body fluid, relieving restlessness, antiemetic (preventing or stopping 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: ①.Internally: 15~30 grams, fresh herb double dosage, or extract juice; ②.Internally: water decoction, 0.5~1 liang (about 15~30 grams), fresh herb 2~4 liang (about 60~120 grams), or extract juice; ③.Internally: water decoction, 15~30 grams, fresh herb 60~120 grams, or fresh herb extract juice. Externally:proper amount, wash with water decoction.




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  • 1.Introduction of Lu Gen:Reed Rhizome or Rhizoma Phragmitis.

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