✵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:Diuretics and Hydragogues Herbs:Herbs Diuretics.
Introduction: Herbs Diuretics: also known as damp-draining diuretic herbs,an agent or substance herbs that increases urine excretion and water discharge for treating internal retention of dampness.
✵Till the date Oct 10th,2019, there are totally  kinds of common TCM herbs,  kinds of related plant species,  kinds of related fungus species,  kinds of related insect species,  kind of related mineral are recorded in this category. These Diuretics and Hydragogues Herbs:Herbs Diuretics are briefly introduced separately:
Herba Polygoni Avicularis(Common Knotgrass Herb).
Brief Introduction: The herb Herba Polygoni Avicularis is the dried aerial part of Polygonum aviculare L.(family Polygonaceae), used (1).to promote diuresis and eliminate damp-heat in cases of stranguria with turbid urine and morbid leukorrhea, and (2).to dispel wind-damp in cases of arthralgia. The herb is commonly known as Herba Polygoni Avicularis, Common Knotgrass Herb, Biān Xù.
✵Official herbal classics and other famous herbal classics defined the herb Herba Polygoni Avicularis(Common Knotgrass Herb) as the dried aerial part or whole herb of the species (1). Polygonum aviculare L. It is a plant of the Polygonum L. genus, the Polygonaceae family of the Polygonales order. This commonly used species is introduced as:
(1).Polygonum aviculare L.: It is commonly known as Biān Xù. Annual herbs. Stems prostrate, ascending or erect, 10~40 cm tall, much-branched from base, with longitudinal ribs. Leaves elliptic, narrowly elliptic or lanceolate, 1~4 cm long, 3~12 mm wide, apex obtuse or acute, base cuneate, margin entire, both surfaces glabrous, lower lateral veins conspicuous; Petiole short or subsessile, base jointed; Leaf-sheath membranous, lower brown, upper white, laceration veins obvious.
Flowers solitary or several clusters in leaf axils, throughout the plant; Bracts membranous; Pedicels slender, apically articulated; Tepals 5-lobed, tepals elliptic, 2~2.5 mm long, green, margin white or reddish; 8 stamens, filaments base spreading; 3 style, stigma capitate. Achene ovate, 3-ribbed, 2.5~3 mm long, dark brown, densely pinstriped with small dots, glabrous, subequal or slightly longer than persistent perianth. Its flowering period is from May to July, fruiting from June to August.
Ecological environment: It grows in fields roadside, wasteland and river, etc. Widely distributed in the north temperate zone; It is distributed all over China. The plant grows in the wetland of farmland and gully at an elevation of 10-4,200 meters. Like cold, humid climate conditions, heat resistance, drought tolerance. The seeds germinated above 10 ℃ and the plants grew well at 15~27 ℃. Its achene resistance to cold is extremely strong, in -40℃ low temperature can be normal overwintering. Good adaptability to the soil, can grow well in general, it can even grow in saline sand wasteland rich in organic matter, fertile sandy loam or loam growth. It is distributed throughout China and produced in most areas of the country.
Trait identification: Dry whole grass, stem cylindrical slightly flat, more curved, about 1.5~3 mm in diameter, brownish-red or gray-green surface, smooth glabrous, with longitudinal texture, nodes expanded, residual reddish-brown or white film transparent sheath, internode length is different; Stem near base, hard, softer at tip, broken face yellowish-white, center with broad pith, sometimes hollow. Leaf-blade greenish-brown or grayish-green, usually glabrescent. Peanuts in leaf axils, red, but most have faded away; Perianth yellow-green, apical margin pink, containing 1 achene, triangular-ovate. The weak smell, cool taste. The herb color green, leaves, quality tender, no impurities is better.