Introduction of Deng Xin Cao:Common Rush or Medulla Junci.

TCM Herbalism:Medicinals and Classifications. ✵The article gives records of the herb Common Rush, its English name, Latin name, property and flavor, its botanical source one plant species, ①.Juncus effusus 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 Common Rush, its pharmacological actions, medicinal efficacy, and administration guide.

Medulla Junci(Common Rush).

dried light yellow herb strips of Medulla Junci Pin Yin Name: Dēnɡ Xīn Cǎo.
 English Name: Common Rush.
 Latin Name: Medulla Junci.
 Property and flavor: slightly cold, sweet, tasteless.

 Brief introduction: The herb Medulla Junci is the dried pith of Juncus effusus L., used (1).to induce diuresis for treating heat stranguria, and (2).to calm the mind for relieving fidgetiness and insomnia. The herb is commonly known as Medulla Junci, Common Rush, Dēnɡ Xīn Cǎo.

 flowering plant of Juncus effusus L with many small flowers Botanical source: Herbal classic book defined the herb Medulla Junci (Common Rush) as the dried pith of the species (1).Juncus effusus L. It is a plant of the Juncus L. genus, the Juncaceae family (rush family) of the Liliflorae order. This commonly used species is introduced:

(1).Juncus effusus L.

 a colorful drawing of Juncus effusus L plant Botanical description: Juncus effusus is also known as J.effusus L.var.decipiens Buchen., or J.decipiens (Buchen.) Nakai., is commonly known as Dēnɡ Xīn Cǎo. A perennial herb, the plant grows up to 40~100 cm tall. The rhizome is amphitropous, dense fibrous roots grow on it. Stems are tufty, upright, thin cylindrical, 1.5~4 mm in diameter, inside is filled with cream white (milk white) medulla, shares a large part of the stem. The leaf sheath is mahogany (reddish-brown) or primrose yellow (faint yellow), and the loner leaf sheath is up to 15 cm long; the leaf blade is degenerated and is aristiform (spiny shape).

 Inflorescences are pseudopleurogenous, cymose, multiflorous (pluriflorous), dense or diffuse; Bracts in connection with stem are 5~20 cm long; Flowers are pea green (pale green), short stipitate, 2~2.5 mm long; 6 tapels (perianth lobes), strip-lanceolate, and are arranged in 2 whorls, outer whorl is slightly longer, margin is membranous, the back surface is pubescent; 3 stamens, or rarely 6 stamens, about 2/3 length of the perianth, anthers are slightly shorter than filaments; 1 pistil, ovary is superior, 3-loculed, style is very short, 3 stigmas.

 Capsularfruit is oblong, the apex is obtuse or emarginate (slightly concave), equal length as perianth or slightly longer, and has 3 intact septa inside. Seeds are many, ovate-oblong, brown, about 0.4 mm long. Its flowering period is from June to July, the fruiting period is from July to October.

 flowering plant of Juncus effusus L. with small white flowers Ecological environment: The plant grows in wet places, such as waterside and near the field. It is distributed in the lower reaches of the Yangtze River, and northwest, and southwest areas of China.

 Growth characteristics: The plant Juncus effusus prefers a moist environment, tolerant to coldness, and avoid drought. Its requirement in the soil is not strict, but it is appropriate to choose moist, fertile, and loose soil for cultivation.

 dried pale colored herb segments of Common Rush Characters of herbs: The herb is thin cylindrical, up to 90 cm long, 1~3 mm in diameter, and the surface is white or yellowish white. Under a magnifying glass, there are protuberant fine longitudinal striation and spongiform (sponge-like) pore spaces. The herb is slightly lustrous, and light, the texture of the herb is soft, elastic (flexible), and easy to break, and the fracture surface is uneven and white. The odor of the herb is indistinctive, it tastes mild. The herb of a better grade has long strips, thick, white, and elastic.

 Pharmacological actions: ①.diuretic effect; ②.hemostatic effect.

 Medicinal efficacy: Clear heart fire, clear away the heart-fire and down bear fire, prompt diuresis, alleviate water retention, prompt diuresis and treat stranguria. It is indicated for upset insomnia, infantile night cry, oliguria and difficulty pain (less urine and difficulty in urination, pains), edema, dysuria (difficulty in micturition), gonorrhea, dampness heat jaundice, pharyngitis (throat obstruction), mouth and tongue sores, trauma, etc.

 Administration of Medulla Junci (Dēnɡ Xīn Cǎo): 
Reference: Administration Guide of Medulla Junci (Dēnɡ Xīn Cǎo)
TCM Books: ①.Internally: 1~3 grams; ②.Internally:water decoction, 5~8 fen (about 1.5~2.4 grams), fresh herb for single herb recipe, 0.5~1 liang (about 15~30 grams), or prepare to pill,powder.Externally:charred the herb with its property retained,prepare to finely ground herb powder and sprinkle,or blow to the throat; ③.Internally: water decoction, 1~3 grams, fresh herb 15~30 grams, or prepared to pill, powder.Externally:proper amount,charred the herb with its property retained,prepare to finely ground herb powder and sprinkle;or mashed the fresh herb and apply stick.




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  • 1.Introduction of Deng Xin Cao:Common Rush or Medulla Junci.

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