1、
. Harvest in spring and autumn, remove impurities and dry in the sun.
[character] this product is mostly crumpled and agglomerated. . The leaves are basal, grayish green, flattened, lanceolate or ovoid lanceolate, 1.5 ～ 6cm long and 1 ～ 2cm wide; the apex is blunt, the base is truncate or slightly heart-shaped, the edge is obtuse serrated, and both sides are hairy; The petiole is thin, 2 ～ 6cm long, and the upper part has obvious narrow wings. The flower stems are slender; Petals 5, violet or light brown; Spur tubulose. The capsule is oval or 3-lobed, and the seeds are mostly light brown. It is slightly bitter and slightly sticky.
[identification] (1) the transverse section of the leaves of this product: the upper epidermal cells are larger, the tangential direction is extended, the outer wall is thicker, the inner wall is viscous and liquefied, and the constant expansion is semi-circular; The cells in the lower epidermis were smaller and occasionally had mucus cells; There are single-cell non glandular hairs on the upper and lower epidermis, 32-240 μ m in length and 24-32 μ m in diameter, with short keratinocyte lines. Palisade cells 2-3 rows; Sponge cells are round like and contain calcium oxalate cluster crystals with a diameter of 11-40 μ M. The vascular bundle of the main vein is tough outside, and there are 1-2 rows of thick horn cells in the upper and lower epidermis.
(2) Take 2G of the product powder, add 20ml of methanol, sonicate for 20 minutes, filter, evaporate the filtrate, heat 10ml of water for the residue, stir to dissolve, filter, evaporate the filtrate, add 1ml of methanol to dissolve the residue, and use it as the test solution. Another 2G of the control medicinal material of Viola yedoensis was prepared into the control medicinal material solution by the same method. . In the chromatogram of the test sample, there are three fluorescent main spots of the same color at the position corresponding to the chromatogram of the control medicinal material.
Decoction pieces
[processing] remove impurities, wash, chop and dry.
[nature, taste and meridian tropism] bitter, pungent and cold. Heart returning and liver meridian.
[functions and indications] it can clear away heat, detoxify, cool blood and reduce swelling. Used for prickly sores, swollen poison, carbuncle and gangrene, erysipelas, snake bite.
[usage and dosage] 15 ～ 30g.
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2、 Chemical constituents of Viola yedoensis

Viola yedoensis contains 10 effective ingredients, including organic acids, flavonoids and their glycosides, phenolic components, sugars, amino acids, peptides and proteins, saponins, phytosterols, tannins, etc. It is rich in copper, iron, manganese, zinc, magnesium and other trace elements.

3、 Pharmacological effects of Viola yedoensis

1. Viola yedoensis has the effect of resistance to pathogenic microorganisms. The decoction has inhibitory effect on Pseudomonas aeruginosa, Escherichia coli, typhoid bacillus, dysentery bacillus, etc; Its alcohol extract and water extract can also kill Leptospira; .

2. Viola yedoensis has anti endotoxin effect.

3. Viola yedoensis has antipyretic, detumescence and anti-inflammatory effects, as well as anti snake venom effects.