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).

Rhizoma Corydalis:herb photo 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.

 Corydalis yanhusuo W. T. Wang.:drawing of whole plant Botanical description: The plant is commonly known as Yán Hú Suǒ. Perennial herb, the plant grows 9~20 cm tall, glabrous. Tuber is oblate globose, diameter is 7~15 mm, upper part is slightly depressed, lower has fibrous root, sometimes longitudinal split into several valves, the cross-section is deep yellow.

 Stem is upright or sloping, often simple, with scales 1 near the base, often swollen into small tubers at stem nodes, new stems at small tubers, and small tubers at new stem nodes, often in clusters of 3~4. 2~4 basal leaves; Handle is 3~8 cm long; Leaf blade profile is broadly triangular, 3-6 cm long, 4-8 cm wide, 2-lobed or 3-lobed, primary lobes are sessile, primary lobes are nearly sessile, lobes are needle-shaped to oblong, 20~30 mm long, 5~8 mm wide, entire, rarely upper part is 2-lobed to lobed. 2 cauline leaves, alternate, smaller and homomorphic than basal leaves.

 Corydalis yanhusuo W. T. Wang.:flowers Racemes are terminal, 2~5 cm long, 3~8 sparsely flowered; Bracts are ovate to narrowly ovate, ca. 10 mm in the lower part of inflorescence, apex is 3-5 pectineal, entire in the upper part. 2 sepals, minute, caducous; Corolla is lavender, 4 red petals, 2 rounds, lobe the largest, 15~25 mm long, the upper stretch into broad obovate to broadly elliptic shape of the pocket flap, margin with small teeth, apex is with shallow sag, some extension growth from the lower, the disc is shorter, can be on the disc, base shallowly cystic protrusions, a wheel within two 10~15 mm long, folded up in stamens, broadly obovate, upper and lower part elongated into a claw; 6 stamens, slightly shorter than inner petals, each 3 united into bundles; Oblong, 8~10 mm long, flowers are short, stigma is nearly round, 8 mastoids. Fruit-shaped, 1.7~2.2 cm long, style, and stigma are persistent, 2-lobed when ripe. Seeds are in 1 row, several, small, flat oblong, black, shiny, surface is densely small concave. Cultivars often bloom only, and fruit falls below maturity. Its flowering period is from March to April, the fruiting period is from April to May.

 Corydalis yanhusuo W. T. Wang.:flowering plant Ecological Environment: the plant grows in mountain forests, or for cultivation. It is mainly distributed in the north area, the lower reaches area 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 humid climate. Better to choose good drainage, fertile and loose, rich humus sandy loam for cultivation.

 Yanhusuo:herb photo Characters of herbs: The dried tubers of the herb are irregularly oblate, with a diameter of 0.5~1.5 cm or 1~2 cm, the surface is yellow or brownish-yellow, with irregular reticular wrinkles, there are slightly concave stem marks in the middle of the top, and bumps at the bottom. The texture of the herb is hard and brittle, the fracture surface is yellow, keratose, and waxy in luster. The herb has no odor or light odor, it tastes bitter. The herb of better grade is big, full, firm, and solid, bright yellow inside. The herb of 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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