Persicaria
![](/Images/godic/202502/02/Persicaria_capitata_AF_crop5517.jpg")
![Persicaria orientalis](/Images/godic/202502/02/Persicaria_orientalis025517.jpg")
![Persicaria glabra](/Images/godic/202502/02/Persicaria_glabra_in_Narshapur_forest,_AP_W_IMG_11095517.jpg")
![Persicaria amphibia](/Images/godic/202502/02/Persicaria_amphibia_kz35517.jpg")
Persicaria is a genus of herbaceous flowering plants in the knotweed family, Polygonaceae. Plants of the genus are known commonly as knotweeds or smartweeds. It has a cosmopolitan distribution, with species occurring nearly worldwide. The genus was segregated from Polygonum.