✵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:
Semen Sinapis Albae(White Mustard Seed).
Brief Introduction: The herb Semen Sinapis Albae is the ripe seed of Brassica alba(L.) Boiss.(family Cruciferae), used to warm the lung and resolve phlegm for treating a cough with profuse expectoration and stuffy feeling in the chest, and also for treating the cold abscess and pleural fluid retention. The herb is commonly known as Semen Sinapis Albae, White Mustard Seed, Bái Jiè Zǐ.
✵The herb Semen Sinapis Albae(White Mustard Seed) is the ripe seed of Brassica alba(L.) Boiss., it is a plant of Sinapis L. genus, the Cruciferae family of the Rhoeadales order.
Common official herbal classics and other famous herbal classics defined the herb Semen Sinapis Albae(White Mustard Seed) as the ripe seed of:(1). Sinapis alba L., This commonly used species is introduced as:
(1).Sinapis alba L.: Annual or biennial, 40~120 cm tall. Stem erect, longitudinally branched, upper part much-branched, scattered with white stiff hairs. Leaves alternate. Thin, stipitate; Leaf blade large head at the base of stem lobed or sublobed, broadly elliptic or ovoid, 6~15 cm long, 2~3 cm wide, apex lobes large. Lateral lobes 1~3 pairs, margin sparsely toothed; Cauline leaves smaller, with short stipitate, ascending lobes fewer. Racemes terminal or axillary; 4 small sepals, green, erect, lanceolate or oblong. Base clawed; 4 stamens, 4 long, 2 short, long stamens 8.5~9.5 mm, short stamens 6~6.5 mm. 1 pistil, ovary long columnar, 9~10 mm long, densely covered with white tufts. Sinew cylindric 2~2.5 cm long, densely covered with white stiff bristles, fruit petals constricted between seeds into rosary beads, sinew apex with a flattened sword-shaped beak. Seeds subglobose, yellowish. Its flowering period is from April to June, fruiting from May to July.
Ecological environment: the plant is native to Europe. It grows in Anhui, Shanxi, Sichuan, Xinjiang, Yunnan provinces of China.
Trait identification: seed nearly spherical, 2~2.5 mm in diameter. The surface is yellowish-white, smooth, under a magnifying glass, with fine reticulations, one end with a round pale brown navel, swollen in water, 2 thick cotyledons, oily, folded longitudinally, radicle enveloping. Smells light, spicy taste, crushed wet, there is a special spicy and strong odor. It is better to have large, full, yellow, white and pure grain.