✵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:Herbs Clearing Heat and Drying Dampness.
Introduction: Herbs Clearing Heat and Drying Dampness: an agent or substance bitter in taste and cold in property that is effective for eliminating heat and dampness, usually used in the treatment of diseases caused by damp-heat, such as acute jaundice, acute dysentery, urinary infection, eczema, boils and abscesses.
✵Till the date Oct 10th,2019, there are totally  kinds of common TCM herbs,  kinds of related plant species, are recorded in this category. These Herbs Clearing Heat and Drying Dampness are briefly introduced separately:
Rhizoma Bistortae(Bistort Rhizome).
Brief Introduction: The Herb Rhizoma Bistortae is the dried rhizome of Polygonum bistorta L.(family Polygonaceae), used (1).to clear heat and counteract toxins for treating dysentery, boils and sores, (2).to arrest bleeding for hematemesis, epistaxis, hemorrhoidal bleeding, and (3)externally for treating snake-bite. The herb is commonly known as Rhizoma Bistortae, Bistort Rhizome, Quán Shēn.
✵Official herbal classics defined the herb Rhizoma Bistortae(Bistort Rhizome) as the dried rhizome of (1).Polygonum bistorta L. Other famous herbal classics defined the herb Rhizoma Bistortae(Bistort Rhizome) as the dried rhizome of species (1). Polygonum bistorta L., (2). Polygonum manshuriense V. Petr.ex Kom. They are plants of the Polygonum Genus, Polygonaceae family, Caryophyllale order. This 2 commonly used species are introduced as:
(1).Polygonum bistorta L.: It is commonly known as Quán Shēn, or Fist-Ginseng, perennial herb. Rhizomes hypertrophic, 1~3 cm in diameter, curved, dark brown. Stem erect, 50~90 cm tall, unbranched, glabrous, usually 2~3 stems from the rhizome. Basal leaves lanceolate or narrowly ovate, papery, 4~18 cm long, 2~5 cm wide; Apical acuminate or acute, base truncate or subcordate, trailing to wing along petiole, both surfaces glabrous or pubescent below, margin curvaceous, slightly undulate, petiole 10~20 cm long; Cauline leaves lanceolate or linear, sessile; Stipules tubular, membranous, lower green, upper brown, apex oblique, dehiscent to middle, not hairy. Racemes spicate, terminal, 4~9 cm long, 0.8~1.2 cm in diameter, compact; Bracts ovate, apical acuminate, membranous, pale brown, midrib conspicuous, each bract containing 3~4 flowers; Pedicels slender, spreading, 5~7 mm long, longer than bracts; Tepals 5-lobed, white or reddish, tepals elliptic, 2~3 mm long; 8 stamens, 3 styles, stigma capitate. Achene elliptic, apex at both ends, brown, lustrous, ca. 3.5 mm long, slightly longer than persistent perianth. Its flowering period is from June to July, fruiting from August to September.
Ecological environment: The plant grows in the wild grass or the wet place. It distributes in Anhui, Gansu, Hebei, Hubei, Jiangsu, Ningxia, Shanxi, Xinjiang, and other areas of China.
Trait identification: Rhizome oblate cylindrical, curved into a shrimp-like shape, 4~15 cm long, 1~2 cm in diameter. Surface purplish brown or purplish-black, slightly coarse, have a denser link and remain fibrous root or root mark, one side is raised, another side is plain or have slight groove. Hard, cross-section nearly renal shape, light brown-red, yellow and white vascular bundles arranged in an intermittent ring. Light smell, taste bitter, astringent. The herb which is thick, hard, cross-section color light reddish-brown is preferred.
(2).Polygonum manshuriense V. Petr. ex Kom.: It is commonly known as Ear-Leaf Polygonum, or ěr Yè Liǎo. Perennial herb, 60~80 cm tall. Rhizome short and stout, subtuberous, 3 cm long, 1 cm in diameter, black. Stem simple, unbranched, erect, smooth, with 8~9 nodes, slightly more sparse. Leaf-sheath rusty, membranous, tubular, longer, apex oblique, upper part of stem pale green; Basal leaves with long stalk, ca. 15 cm long; Leaf blade grassy, oblong or lanceolate, ca. 15 cm long, ca. 2~3 cm wide, base cuneate, apex acuminate, entire or microwave, apex of veins inconspicuously raised, abaxially gray-blue, glabrous, leaf blade subpersistent to stalk; Stem middle and upper leaves sessile, triangular-lanceolate, size amplitude varies greatly, base clasps stem, leaf is ear shape.
Spikelets simple, terminal, cylindrical, 4~7.5 cm long, bracts brown, membranous, elliptic or oblong, slightly caudate acute; Perianth 5-lobed, pink or white, 8 stamens, 3 styles, slender, nutty, ovate-triangular, ca. 3 mm long, pointed, light brown, glossy. Its flowering period is from June to July, fruiting from August to September.
Ecological environment: The plant grows on a hillside or in the grass, it mainly distributes in the north area of China.