Introduction of Du Huo:Doubleteeth Pubescent Angelica Root or Radix Angelicae Pubescentis.
✵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:Dispelling Wind-Damp Herbs.
Introduction: Dispelling Wind-Damp Herbs: an agent or substance herbs that dispels wind and damp, mainly for relieving rheumatism and related conditions.
✵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 dispelling wind-damp herbs are briefly introduced separately:
Pin Yin Name: Dú Huó.
English Name: Doubleteeth Pubescent Angelica Root.
Latin Name: Radix Angelicae Pubescentis.
Property and flavor: slight warm, pungent, bitter.
Brief introduction: The herb Radix Angelicae Pubescentis is the dried root of Angelica pubescens Maxim.f.biserrata Shan et Yuan(family Umbelliferae), used to dispel wind-damp, relieve arthralgia and release the superficies for wind-cold-damp(rheumatic or rheumatoid) arthalgia, especially that of the lower part of the body, and affliction of wind-cold with damp. The herb is commonly known as Radix Angelicae Pubescentis, Doubleteeth Pubescent Angelica Root, Dú Huó.
Botanical source: Official herbal classics defined the herb Radix Angelicae Pubescentis(Doubleteeth Pubescent Angelica Root) as the dried root of (1). Angelica pubescens Maxim. f. biserrata Shan et Yuan. Other common famous herbal classics defined the herb Radix Angelicae Pubescentis(Doubleteeth Pubescent Angelica Root) as the dried root of (1). Angelica pubescens Maxim. f. biserrata Shan et Yuan., (2). Angelica pubescens Maxim., (3). Purple stem Angelica pubescens., (4). Heracleum hemsleyanum Diels. They are plants of the Angelica L. genus, Apiaceae family, Apiales order. This officially defined species and other usable species are introduced as:
(1).Angelica pubescens Maxim. f. biserrata Shan et Yuan.: Botanical description: It is commonly known as Chóng Chǐ Máo Dāng Guī. Perennial herbs. Stem erect, purplish, longitudinally furrowed. Petiole of rhizome leaves and lower stem leaves are slender, base into a broad sheath, margin membranous. Leaf-blade ovoid, 2-gyrus 3-pinnately compound, smaller leaf blade 3-lobed, eventually lobed oblong, 4~8 cm long, 2~3 cm wide, apex acuminate, base cuneate or rounded, margin irregularly doubly serrate, both sides pubescent, the upper part of stem simplified into the swollen sheath. Compound umbel terminal or lateral, involucral bracts absent; 10~25 spokes, rarely up to 45, unequal, densely yellow pubescent; Inflorescence cymose with 15~30 flowers; 5~8 involucral bracts, lanceolate; Flowers white; Calyx teeth shortly triangular; 5 petals, equally large, broadly ovate, apex acute, inflexed; 5 stamens, filaments internally curved; Lower ovary. The dorsal part of bicuspid fruit is flat, oblong, the base is concave, dorsal edge and middle edge are raised, the lateral edge is a wing, there are 1~4 tubing between furrow, the confluent surface has 4~5 tubings. Its flowering period is from July to September, fruiting from September to October.
Ecological environment: The plant distributes in the middle and lower reaches areas of the Yangtze River, China.
Growth characteristics: The plant Angelica pubescens prefers a cool and humid climate, cold resistance, suitable for growth in the alpine mountainous areas at the altitude of 1200~2000 meters above sea level. It is not suitable to grow on shallow soil, water, and cohesive soil, but on black grey bubble soil and yellow sand soil with a deep soil layer and rich humus.
Characters of herbs: The root head and principal root are stout, slightly cylindrical, long, 1.5~4 cm long, 1.5~3.5 cm in diameter, with several curved branches at the lower part, 12~30 cm long, 0.5~1.5 cm in diameter. The surface is rough, grayish-brown, with irregular longitudinal wrinkles and transverse cracks, and many transverse lenticels and fine root marks; The root head is ringed, with multiple circular petiole marks, and the middle is a hollow stem mark. Hard, cross-section sallow white, cambium ring brown, brown oil spots (tubing) skin, wood yellow-brown; The root head cross-section has the big shape curved part, also has the oil spot. Special aroma, bitter taste, slightly tingle tongue, the thick, oily, strong fragrance for the best.
Pharmacological actions: ①. Effect on platelet aggregation and experimental thrombosis; ②. Effect on cardiovascular system; ③. Spasmolysis: Capricolactone, xanthotoxin and isopeulustrin have an obvious spasmolysis effect on the ileum of rabbits; ④. Analgesic, sedative, and anti-inflammatory effects: Radix Angelicae Pubescentis decoction test showed obvious analgesic effects. ⑤. Antimicrobial effect: osthole and xanthotoxin showed a wide antibacterial spectrum in vitro tests on 11 strains. Umbelliferone has an obvious inhibitory effect on Brucella. ⑥. light sensitization: bergapten, xanthotoxin and isopeulustrin, and furocoumarin compounds are light active substances when they enter the body, once shine by the sunlight or ultraviolet light, then can make the illuminated solar dermatitis, the exposed skin is affected by swelling, the pigment in the irradiated area, even skin thickening, etc. ⑦. Other effects: bergapten has a moderate protective effect on the experimental gastric ulcer. xanthotoxin and bergapten have the killing effect on Eichtenberg ascites cancer cells.
Medicinal efficacy: Dispel wind and eliminate dampness, dispel cold, relieve pain and numbness. It is indicated for arthritis with fixed pain caused by dampness due to wind and cold, the pain of waist and knee, the headache of Shaoyin and hidden wind, clonic pain of hands and feet, chronic tracheitis, headache, and toothache.
Administration of Radix Angelicae Pubescentis(Dú Huó):
Administration Guide of Radix Angelicae Pubescentis(Dú Huó)
Internally:3~9 grams(CP),Internally:water decoction, 1~3 qian(about 3~9 grams), infusing in wine or prepare to pill,powder.Externally:wash with water decoction(DCTM),Internally:water decoction, 3~10 grams,or infusing in wine,or prepare to pill,powder.Externally:proper amount,wash with water decoction(CHMM).
(2).Angelica pubescens Maxim.: Botanical description: It is commonly known as Máo Dāng Guī. Herbs perennial, 1~3 meters tall. Stem purplish, glabrous. Root leaves and lower stem leaves 2-gyrus 3-pinnately compound, small leaves ovoid, 4~14 cm long, 2.5~8 cm wide, margin obtuse, apex acuminate, base rounded or cuneate, veins sparsely pubescent, the upper part of stem leaves gradually simplified into expanded leaf sheaths. Inflorescence complex; corymbose 10~20, involucre absent or with 1~2 sheaths; Inflorescence cymose with 16~30 flowers; Involucre several, flowers white; Calyx teeth shortly triangular; 5 petals, 5 stamens; Lower ovary. The double pendulous fruit is oblate, the back is a ridge, the lateral edge is a wing, there is 1 tubing in each furrow, there are 2 tubings in the commissure. The flowering period is from June to August, fruiting period is from August to September.
Ecological environment: The plant grows in valleys, ditches, grass, or bushes. It grows in the undergrowth grass, valley edge, or hillside roadside area with an altitude of 950~2,400 meters above sea level. The plant distributes in the lower reaches area of the Yangtze River, Guangxi, Xinjiang, and other areas of China.
(3).Purple stem Angelica pubescens.: Botanical description: Perennial herbs, 1~2 meters tall. Stem dark purple, longitudinally furrowed, upper with a few branches, densely shortly hirsute. Leaves alternate, lower and middle leaves 2~3 gyrus pinnate deeply lobed, ultimate lobes narrowly ovate, narrowly lanceolate or linear-lanceolate, 2~5 cm long, 6~12 mm wide, veins on both surfaces finely hairy, margin with incised sharp teeth; Base of petiole dilated into the sheath. Upper leaves simplified into purplish-black sacs, densely tomentose. Compound umbel terminal, pedicel hairy; Without involucre; 20~30 spokes, densely pilose; Involucral bracts subulate, ciliate; Flowers purple, less white. Fruit elliptic in width, 0.6~1 cm long, 5~7 mm wide; Hanging fruit flat, with wide wings, dorsal ribs thin line.
Ecological environment: The plant grows on the hillside grass. The plant mainly distributes in the north and other areas of China.
(4).Heracleum hemsleyanum Diels.: Botanical description: It is commonly known as Niú Wěi Dú Huó. Perennial herbs, 0.5~1.5 meters tall. Roots long conical, sometimes with slender branches. Stem simple, the surface has longitudinal groove grain, sparsely pubescent. Petiole of basal leaf and lower part of stem 8~17 cm long, base expanded into broadleaf sheath, margin membranous; 1~2 gyrus pinnately divided, 3~5 lobes, broadly ovate or ovate, 5~13 cm long, 4~20 cm wide, 3-lobed, margin irregularly serrate, both sides sparsely pubescent, upper stem leaves smaller, 3-lobed to 3-luanhea. Compound umbellate inflorescence terminal, dense sarcophenous pilose; 16~18 umbrella spokes, 3.5~9 cm long; Involucre few, lanceolate, sometimes margin pinnate lobed, 5~8 bracteoles, linear-lanceolate, pilose, inflorescences inflorescence with flowers ca. 20, white; Calyx teeth not conspicuous; 5 petals, tip concave, unequal in size; 5 stamens; Ovary inferior, densely puberulent, style base conical. Fruit oblate, 6~7 mm long, 5 mm wide, dorsal ribs insignificant, 4 tubings, 2 tubings on commissure, lateral ribs developed into wings. Its flowering period is from May to July, fruiting period is from August to September.
Ecological environment: The plant grows on hillsides, under thickets, and forests. It mainly distributes in the middle reaches area of the Yangtze River, southwest, and other areas of China.
1.Introduction of Du Huo:Doubleteeth Pubescent Angelica Root or Radix Angelicae Pubescentis.
2.TCM Books:DCTM(Dictionary of the Chinese Traditional Medicine),CHMM(Chinese Herbal Materia Medica).