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Polygonum persicaria
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Caryophyllales
Family: Polygonaceae

Polygonaceae is a family of flowering plants are herbs, shrubs, or rarely trees comprising about 30 genera and 1,000 species. The leaves are simple, alternate or rarely opposite, and usually stipulate. Some well known members include buckwheat (Fagopyrum), sorrel (Rumex), rhubarb (Rheum), and knotweed (Polygonum).