Introduction of Bai Mao Gen:Lalang Grass Rhizome or Rhizoma Imperatae.

TCM Herbalism:Medicinals and Classifications. ✵The article gives records of the herb Lalang Grass Rhizome, its English name, Latin name, property and flavor, its botanical source one plant species, ①.Imperata cylindrica Beauv.var.major(Nees)C.E.Hubb., 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 Lalang Grass Rhizome, its pharmacological actions, medicinal efficacy, and administration guide.

Rhizoma Imperatae(Lalang Grass Rhizome).

Lalang Grass Rhizome:plant and herb Pin Yin Name: Bái Máo Gēn.
 English Name: Lalang Grass Rhizome.
 Latin Name: Rhizoma Imperatae.
 Property and flavor: cold, sweet.

 Brief introduction: The herb Rhizoma Imperatae is the dried rhizome of Imperata cylindrica Beauv.var.major(Nees)C.E. Hubb.(family Graminae), used to cool blood, stanch bleeding, clear heat and induce diuresis for the treatment of epistaxis and hematuria due to blood heat, edema, jaundice, and stranguria associated with heat. The herb is commonly known as Rhizoma Imperatae, Lalang Grass Rhizome, Bái Máo Gēn.

 Botanical source: The herb Rhizoma Imperatae is the dried rhizome of Imperata cylindrica Beauv.var.major(Nees)C.E. Hubb., it is a plant of the Imperata Cyr. Genus, the Poaceae(Gramineae) family of the Poales order.

(1).Imperata cylindrica Beauv.var.major(Nees)C.E.Hubb.

 Imperata cylindrica Beauv.var.major Nees C.E.Hubb.:growing plant Botanical description: The Imperata cylindrica Beauv.var.major(Nees)C.E. Hubb., is a plant of the Graminaceae(Poaceae) family and Imperata Cyr genus, it is commonly known as "Imperata cylindrica", or "Bai Mao", perennial herb, with stout rhizomes. Stems erect, high 30~80 cm, with 1~3 nodes, section glabrous. Leaf sheaths accumulate on stalks, much longer than the internodes, and are thicker in texture and fibrous in old ones; ligule membranous, ca. 2 mm in length, pilose up close to their dorsal or sheathlike ovules, and tiller blades approximately 20 cm in length, width is about 8 mm, flat, thin texture; stalk leaves 1~3 cm long, narrowly linear, usually involute, apically apical, apically narrowed, or stipitate, hard, covered with white powder, Base pilose on the mask. Panicle dense, length 20 cm, width 3 cm, spike length 4.5~6 mm, base discs with 12~16 mm long filamentous pilose; both leaves and marginal membranous, nearly equal, with 5-9 veins, acuminate apically or slightly blunt, often with cilia, sparsely growing filamentous hairs between veins, first outer ovate-lanceolate, 2/3 as long as glume, transparent membranous, absent Veins, tip or dentate, second lemma nearly equal to lemma, approximately half as long as ovate, ovoid, dentate and ciliate at tip; 2 stamens, anthers 3~4 mm long; style slender The basal part of the stigma is 2, purplish-black, pinnate, ca. 4 mm in length, extending from the tip of the spikelet. The caryopsis is elliptic, about 1 mm long, and the embryo length is half of the caryopsis. Chromosome 2n = 20(Mehra K. L. et al., 1962; Singh. D. N., 1964). The flowering and fruiting period is from April to June.

 Lalang Grass Rhizome.:fresh herb Scallops, villous filaments on stem segments; long rhizomes, prominent leaf veins, cilia at margins of leaf sheaths and sheaths; branching of panicles densely; silvery filaments villous at the base of spikelets, mature caryopsis, shedding from the handle. Imperata, also known as thatch, root, perennial herb, grows in all parts of China's north and south, grows in riverbanks, fields, wasteland. Imperata plants are squill-shaped, and the leaves are narrow and long. The floret gathers as spikes, often with reddish brown, and the fruit is white fluffy hairy masses. Imperata roots can be used as medicine, stems, and leaves can be made of ropes, because of strong vitality, but also be planted in the harsh environment as ground cover plants.

 Growth habit: The plant is adaptable, resistant to shade, tolerant to thin and drought, like moist and loose soil, rhizomes can grow up to 2 to 3 meters or more in proper soil conditions, can penetrate the roots of trees, the roots can regenerate at the break.

 Imperata cylindrica Beauv.var.major Nees C.E.Hubb.:flowering plant Growth characteristics: The imperata cylindrica grows on the roadside, hillside, grassland. It distributes throughout the area of China. The plant prefers a warm and humid climate, it prefers sun and drought resistance, appropriate to choose a general slope or flat field for cultivation.

 Lalang Grass Rhizome.:dried herb Characters of herbs: The rhizome is long cylindrical, sometimes branched, with different lengths, 30 ~ 60 cm in length and 2~4 mm in diameter. The surface is yellowish white or light yellow, slightly shiny, with longitudinal wrinkles, obvious links and slight protrusions, with gray-brown scales and fine roots remaining on the nodes, with different internodes, usually 1~3 cm long. The texture of the herb is light, tough, the fracture surface is fibrous, yellowish-white, with many radial cracks. The vascular cylinder is yellowish, easy to peel off from the cortex, and sometimes a small hole can be seen in the center. The herb has slight smell, it tastes slightly sweet. The herb which is thick strips, white color and tastes sweet is better.

 Pharmacological actions: ①.significantly shorten the coagulation time, root powder can shorten the rabbit plasma calcium recovery time; ②.the decoction of the herb has analgesic and anti-inflammatory effects by gavage; ③.inhibit the writhing reaction of acetic acid in mice and the increase of capillary permeability caused by acetic acid; ④.inhibitory effect on tuberculosis bacilli, pneumococcus, catacoccus, dysentery bacilli and B pneumonia virus.

 Medicinal efficacy: Cool blood to stanch bleeding, clear heat and generate body fluid, clear heat and diuretic, diuretic and treating stranguria. The herb is indicated for blood heat and vomiting blood, blood heat and bleeding, epistaxis, hematuria, febrile disease and dysphoria, stomach heat vomiting, jaundice, edema, lung heat and asthma cough, pyretic stranguria and pain of obstruction, dripping discharge of urine and pain, acute nephritis and edema, jaundice, etc.

 Administration of Rhizoma Imperatae(Bái Máo Gēn): 
Reference: Administration Guide of Rhizoma Imperatae(Bái Máo Gēn)
TCM Books: ①.Internally:9~30 grams,fresh herb 30~60 grams;②.Internally:water decoction, 3~5 qian(about 9~15 grams),fresh herb 1~2 liang(about 30~60 grams), extract juice or prepare to ground herb powder;③.Internally:water decoction, 10~30 grams, fresh herb 30~60 grams; or extract juice.Externally:proper amount, extract juice with fresh herb and smear.

Herbs Clearing Heat and Cooling the Blood.

 Introduction:Herbs Clearing Heat and Cooling the Blood: an agent or substance herbs that has the effect of eliminating pathological heat from the nutrient and blood systems in cases of warm diseases marked by fever accompanied by delirium, eruptions and bleeding symptoms, and also in other diseases with bleeding due to heat in the blood.
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