Polygonum amphibium

Polygonum amphibium

(Guizhou herbal medicine)

Xiaohuangyao (Guizhou herbal medicine).

[source] it is the whole plant of Polygonum amphibium.

[plant morphology] Polygonum amphibium

Herbs perennial with rhizomes. The leaves are oblong, floating on the water, 5-12 cm long, 2.5-4 cm wide, apex obtuse, base usually heart-shaped. Terrestrial: stem erect, unbranched; leaves with short stalks; leaves broadly lanceolate, densely short bristle, 6-14 cm long, 1.5-2 cm wide, apex acute, base nearly round; stipules tubular, apex truncate. Inflorescence spicate, terminal or axillary; bracts triangular; flowers reddish or white; perianth 5-lobed; stamens 5; style 2, extending beyond perianth. Achene suborbicular, convex on both sides, black, glossy.

It grows in lakes, rivers, shallow water and waterfront wetlands. Distributed in Jilin, Liaoning, Hebei, Shanxi, Shandong, Shaanxi, Hubei, Yunnan, Guizhou and other places.

[collection] harvest in summer and autumn.

[chemical constituents] it contains flavonoid Hyperoside, Ruixu glycoside, quercetin, kaempferol and luteolin-7-glucoside, chlorogenic acid and caffeic acid. In addition, it contains alkaloids. When it grows in water, it contains trace alkaloids, the flowering period increases to 0.017%, and then disappears. If it grows on land, it contains 0.04% at the beginning of flowering and 0.29% in full bloom. If it was transplanted into water, the content of alkaloids decreased again.

[pharmacological action] for the action of luteolin, please refer to "Lonicera japonica Thunb.".

[nature and taste] Guizhou herbal medicine: "the nature is flat, the taste is bitter. "

[function indications] Guizhou herbal medicine: "clearing heat and removing dampness. For dysentery, swelling of feet and sores. "

[usage and dosage] oral administration: decoction, 0.5-1 Liang. External use: tamping.

[prescription selection] treatment of acne: xiaohuangyao and yeyan are three coins each. Tamping and external application. (Guizhou herbal medicine)