Polygoni Avicularis Herba (萹蓄) is the dried aerial part of Polygonum aviculare L., family Polygonaceae.
Bianxu (Chinese name), Common Knotgrass Herb
Stem cylindrical and somewhat flattened, branched. External greyish-green or brownish-red, with fine and slightly prominent longitudinal striations; nodes slightly swollen, with pale brown membranous stipulate sheaths, internodes; texture hard, easily broken, fracture with a white pith. Leaves alternate, almost sessile or short petioled; lamina frequently fallen off, crumpled or broken, when whole, lanceolate, margin entire, both surfaces brownish-green or greyish-green. Odor, slight; taste, slightly bitter.
Important cultivation area
Wide spread cultivated in China.
Eliminate foreign matters, wash clean, cut into sections and dry.
Traditional Chinese Medicine action
Bitter; slightly cold. Enter urinary bladder channel. Disinhibit urine to relieve stranguria, kill worms, and relieve itching.
Usage and dosage
9-15 g, decoction for oral use. Appropriate amount for external use, decocted for bathing of the pars affecta.
* Contraindication and precaution *
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