Yang iron leaf is a perennial herb belonging to the genus Sour Mould, family Polygonaceae.

Yang iron leaves alias Yang iron leaves, Yang iron acid mold, cow tongue tree, Batian acid mold. Perennial herb, 1-1.5 meters high. Stem erect, stout, unbranched or branched, sulcate. Basal leaves thickly petiolate; leaf blade oblong-lanceolate, 15-30 cm long, 4-8 cm wide, apex acute or obtuse, base rounded or subcordate, entire or margin undulate.

The upper leaves are small and narrow, nearly sessile; the ocrea is cylindrical, membranous. Inflorescences large panicles, terminal or axillary; flowers bisexual; tepals 6, in 2 whorls, enlarged, broadly cordate, reticulate, entire, one or all tuberous; stamens 6; stigmas 3, brushlike. Achenes ovate, with 3 acute ridges, brown, shiny.

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Yangtie leaves are produced in northeast, north China, northwest, Shandong, Henan, Hunan, Hubei, Sichuan and Tibet. Foreign distribution in Gaojia Haiga, Kazakhstan, Russia, Mongolia and Europe.

Yang Tie Leaf is found in wetlands and watersides of ditches, at an altitude of 20-4000 meters, and also at the edge of villages, roadsides, and wetlands. The roots contain tannins which can be used to extract tannins. The roots are bitter, sour and cold. It is slightly poisonous. It cools blood to stop bleeding, clears heat and removes toxins, laxative and insecticide.

Baidu Encyclopedia - Yang Tie Ye Zi

Baidu Encyclopedia - Batian Acid Mold