Cogongrass rhizome is the root of the plant cogongrass rhizome, which has medicinal value.
The rhizome is long and cylindrical, sometimes branched, with different lengths, 2-4 mm in diameter, yellow-white or yellowish on the surface, shiny, with obvious longitudinal wrinkles, gray-brown scales, fine roots remaining on the nodes, and the node length is 1-3 cm.
Light weight, tough texture, fiber fracture, yellowish white, multiple radial cracks, and sometimes a small hole can be seen in the center. Slight breath, slightly sweet taste. Thick strips, white color and sweet taste are preferred.
Processing function of cogongrass rhizome
Raw cogongrass rhizome can cool blood, clear heat and induce diuresis. It is often used for various bleeding syndromes such as blood-heat rash, heat stranguria, dysuria, edema, damp-heat jaundice, excess heat, polydipsia, vomiting due to stomach heat, cough due to lung heat, etc. Hemorrhage syndrome caused by excessive blood heat can be treated with large doses of decoction, especially for hematuria, which can play a role in diuresis and hemostasis.
For example, Maogen Decoction for treating qi deficiency, blood heat and hematuria (The Secret of Outer Taiwan); Rhizoma Imperatae powder for treating fever, vomiting and inedible food (Taiping Shenghui recipe); Acute nephritis prescription for treating acute nephritis edema (clinical application of traditional Chinese medicine)
The grass roots are charcoal, with astringent taste and weakened coldness. The effect of clearing heat and cooling blood is slight, and the hemostatic effect is enhanced. It is specially used for bleeding syndrome, tends to converge and stop bleeding, and is often used for patients with acute bleeding syndrome. Such as Shi Hui San.