Polygoni Avicularis Herba (萹蓄)

Polygoni Avicularis Herba (萹蓄)

Polygoni Avicularis Herba (萹蓄)  is the dried aerial part of Polygonum aviculare L., family Polygonaceae.

Other name   
Bianxu (Chinese name), Common Knotgrass Herb

Macroscopic character
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.

Processing method
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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