Introduction of Yan Hu Suo:Yanhusuo or Rhizoma Corydalis.

TCM Herbalism:Medicinals and Classifications. ✵The article gives records of the herb Yanhusuo, its English name, Latin name, property and flavor, its botanical source one plant species, ①.Corydalis yanhusuo W.T.Wang., with a detailed introduction to the botanical features of this plant species, the growth characteristics, and ecological environment of this plant species, the features of the herb Yanhusuo, its pharmacological actions, medicinal efficacy, and administration guide.

Rhizoma Corydalis(Yanhusuo).

dried yellow brownish herbs of Rhizoma Corydalis Pin Yin Name: Yán Hú Suǒ, or Yuán Hú.
 English Name: Yanhusuo.
 Latin Name: Rhizoma Corydalis.
 Property and flavor: warm, pungent, bitter.

 Brief introduction: The herb Rhizoma Corydalis is the steamed and dried tuber of Corydalis turtschaninovii Bess, used to activate blood and move Qi for relieving pain in the chest and abdomen, dysmenorrhea, and traumatic pain. The herb is commonly known as Rhizoma Corydalis, Yanhusuo, Yán Hú Suǒ, or Yuán Hú.

 Botanical source: Herbal classic book defined the herb Rhizoma Corydalis (Yanhusuo) as the dried tuber of the species (1). Corydalis yanhusuo W. T. Wang. It is a plant of Corydalis DC. genus, the Papaveraceae family (poppy family) of the Rhoeadales order. This commonly used species is introduced:

(1).Corydalis yanhusuo W.T.Wang.

 a colorful drawing of Corydalis yanhusuo W. T. Wang.,whole plant with rhizome,leaves and pink flowers Botanical description: Corydalis yanhusuo W.T.Wang is also known as Corydalis turtschaninovii Bess.f.yanhusuo Y.H.Chou et C.C.Hsu., is commonly known as Yán Hú Suǒ. A perennial herb, the plant grows 9~20 cm tall, glabrous. Tuber is oblate, 7~15 mm in diameter, the upper part is slightly sunken, the lower part has fibrous roots, sometimes longitudinally crack into several valves, and the fracture surface is deep yellow.

 The stem is upright or inclined, often simple, with 1 scale near the base, often enlarged into small tubers at stem nodes, new stems grow out from small tubers, and small tubers grow out at new stem nodes, often 3~4 tubers form a cluster. 2~4 basal leaves; petioles are 3~8 cm long; the outline of leaf blade is broadly triangular, 3-6 cm long, 4-8 cm wide, biternate deeply divided, primary lobe is stipitate, terminal lobes are subsessile, lobes are lanceolate to oblong oval, 20~30 mm long, 5~8 mm wide, entire, the upper part of a few is deeply 2-parted to shallowly lobed; 2 cauline leaves, alternate, smaller than basal leaves and homomorphic.

 pink flowers of Corydalis yanhusuo W. T. Wang. Racemes are apical, 2~5 cm long, 3~8 sparse flowers; flower bracts are oval (egg-shaped) to narrowly ovate, bracts on the lower part of inflorescence are about 10 mm long, apex is 3-5 segmental split, the bracts on the upper part is entire; 2 sepals (calyx lobes), fine and small, caducous; Corolla is pale violet-red, 4 flower petals, in 2 whorls, petals in the out whorl is the biggest, 15~25 mm long, the upper part stretch into broad obovate to broadly elliptic pocket-shaped flap, margin has small teeth, apex has shallow sag, the middle and lower part extend to long calcar, the lower valve is shorter, same shape as the upper valve, base has shallow saccular protrusions, two valves in the inner whorl are 10~15 mm long, folded up ane wrapped outside stamens, the upper part is broadly obovate, the middle and lower parts are thin and long into a claw; 6 stamens, slightly shorter than flower petals in the inner whorl, each 3 connate into a bundle; ovary is strip shaped, 8~10 mm long, style is thin and short, stigma is orbicular, 8 papillae.

 Capsularfruit is strip-shaped, 1.7~2.2 cm long, style and stigma are persistent, and turn 2-lobed at maturity. Seeds are in 1 row, several grains, fine and small, flat long elliptic, black, shiny (glossy), surface is densely covered with small pits. Cultivars often bloom only, and fruit falls before maturity. Its flowering period is from March to April, the fruiting period is from April to May.

 flowering plant of Corydalis yanhusuo W. T. Wang. with pink flower spikes Ecological Environment: The plant grows in mountain forests, meadows and weald, hills, and forest edges, or for cultivation. It is mainly distributed in the northern area, the lower reaches of the Yangtze River, and other areas of China. It prefers a warm and moist climate. The plant is suitable for good drainage, fertile loose, rich humus sandy loam.

 Growth characteristics: The plant Corydalis yanhusuo prefers a warm and moist climate. It is appropriate to choose a sunny field with good drainage, fertile and loose, neutral and slightly acid humus-rich sandy loam or loam for cultivation.

 dried brownish herbs of Yanhusuo are piled together Characters of herbs: The dried tubers of the herb are irregularly oblate, 0.5~1.5 cm or 1~2 cm in diameter, the surface is sallow (grayish yellow) or brownish-yellow, with irregular reticular fine wrinkles, there are stem marks or root marks at the slightly concave part on the bottom, and round it there are several small protrusions; there are several lumpy lateral root tubers in different sizes on the upper part and sides, there are stem marks and buds on the central sunken part of the main tuber root and lateral tuber root, some tuber roots are in valves or its upper part is in 2~3 valves. The texture of the herb is firm and hard, difficult to break, the fracture surface is yellow or yellowish brown, corneous, and has a waxy luster. The herb has no odor or mild odor, it tastes bitter. The herb of a better grade is big, full, firm, and solid, the fracture surface is bright yellow. The herb of an inferior grade is small, grayish-yellow, and the center is white.

 Pharmacological actions: ①.obvious analgesic effect; ②.significantly dilate coronary vessels, reduce coronary resistance, increase blood flow; ③.sedative and hypnotic effects; ④.reduce gastric juice secretion.

 Medicinal efficacy: Activate blood circulation, dissipate blood stasis, regulate Qi and relieve pain. It is indicated for pain in the chest and flank, epigastric aching and pain, pains in waist and knee, amenorrhea and dysmenorrhea (abdominal pain after menstruation), irregular menstruation, abdominal mass, metrorrhagia, postpartum blood vertigo, lochiorrhagia, postpartum blood stasis, injuries from falls.

 Administration of Rhizoma Corydalis (Yán Hú Suǒ): 
Reference: Administration Guide of Rhizoma Corydalis (Yán Hú Suǒ)
TCM Books: ①.Internally:3~9 grams;prepare to ground herb powder and swallow take,1.5~3 grams each time; ②.Internally:water decoction,1.5~3 qian (about 4.5~9 grams), or prepare to pill, powder; ③.Internally:water decoction, 1.5~3 qian (about 4.5~9 grams), or prepared to pill, powder.
 Contraindications, Precautions and Adverse Reactions:the herb Rhizoma Corydalis should be used cautiously during pregnancy, or should forbidden using during pregnancy, advanced menstruation.




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