✵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:expectorants,herbs for resolving cold-phlegm.
Introduction: Expectorants,herbs for resolving cold-phlegm: an agent or substance herbs warm in property, used in treating disorders of cold-phlegm or phlegm-dampness.
✵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 expectorants, herbs for resolving cold-phlegm are briefly introduced separately:
Radix Asteris(Tartarian Aster Root).
Brief Introduction: The herb Radix Asteris is the dried root and rhizome of Aster tataricus L.f.(family Compositae), used as an expectorant and antitussive for a cough with profuse phlegm and also for phthisical cough. The herb is commonly known as Radix Asteris, Tartarian Aster Root, Zǐ Wǎn.
✵The herb Radix Asteris(Tartarian Aster Root) is the dried root and rhizome of Aster tataricus L.f., they are plants of the Aster L. genus, the Compositae family of the Campanulales order.
Common official herbal classics and other famous herbal classics defined the herb Radix Asteris(Tartarian Aster Root) as the dried root and rhizome of:(1). Aster tataricus L.f. This commonly used species is introduced as:
(1).Aster tataricus L.f.: Perennial herbs, 40~150 cm tall. Stems erect, often undivided, stout, sparsely hispid. The rhizome is short, must give birth to most fibrous roots. Basal leaves withered, deciduous, oblong-spatulate or ellipsoid, 20~50 cm long, 3~13 cm wide, base descending; Cauline leaves alternate, sessile; Leaf blade oblong or lanceolate, 18~35 cm long, base descending; Cauline leaves alternate, sessile; Leaf blade elliptic or lanceolate, 18~35 cm long, 5~10 cm wide, midrib stout, with 6-10 pairs of pinnate lateral veins. Inflorescences mostly, 2.5~4.5 cm in diameter, arranged in a corymbose pattern. Involucral bracts hemispherical, 10~25 mm wide, involucral bracts 3 layers, outer layer gradually shorter, all or upper grassy, apex apical or rounded, margin broadly membranous, purplish-red; Inflorescence margin ligulate, ca. 20, blue-purple, ligulate apex 3-dentate, style, stigma 2-bifurcated; Central have much tube shape flower, bisexual, yellow, apex 5 tooth crack; 5 stamens; Stigma bifurcated. Achene obovate-oblong, flat, purple-brown, 2.5~3 mm long, with 1 or at least 3 veins on each side, upper with short pubescent hairs, crown hair stained white or reddish. Its flowering period is from July to September, fruiting from September to October.
Ecological environment: The plant grows in lowland wetland, hilltop, and lowland grassland and marsh. The plant mainly distributes in the north area, south of Gansu and north of Anhui, west of Henan in China.
Trait identification: the rhizome is a regular block, 2~5 cm long, 1~3 cm in diameter; Surface is purplish-red or grayish red, apex colonized stem base and petiole colonized, middle-lower clustered most fine roots; Hard, flat section, oily. Roots numerous, slender, 6~15 cm long, 1~3 mm in diameter, mostly braided; Surface is purplish-red or grayish red, with longitudinal wrinkles; Quality is more pliable, easy to break, section light brown, the edge is a circle of purplish red, there is a small wood heart. Slight fragrance, sweet and bitter taste. The herb with long root, color purplish red, quality flexibility is better.