Synonyms: Persicaria dubia; Persicaria hydropiper mite; Persicaria hydropiper mitis (heterotypic); Persicaria laxiflora; Polygonum alpinum (heterotypic); Polygonum angustifolium majus; Polygonum braunii; Polygonum braunii var. hybridum; Polygonum condensatum (homotypic); Polygonum dubium (heterotypic); Polygonum dubium f. albidum; Polygonum dubium f. angustifolium; Polygonum dubium f. effusum; Polygonum dubium f. patens; Polygonum dubium f. rectum; Polygonum dubium f. rubellum; Polygonum dubium f. ruderale; Polygonum dubium f. simplex; Polygonum dubium f. uliginosum; Polygonum dubium var. hybridum (homotypic); Polygonum hydropiper laxiflorum; Polygonum hydropiper mite; Polygonum intermedium; Polygonum lapathifolium mite; Polygonum laxiflorum (heterotypic); Polygonum minus (heterotypic); Polygonum minus var. laxiflorum; Polygonum mite (heterotypic); Polygonum mite f. erecta; Polygonum mite f. procumbens; Polygonum mite f. submersum; Polygonum mite f. subsimplex; Polygonum mite laxiflorum; Polygonum mite longifolium; Polygonum mite var. albidum; Polygonum mite var. leptostachyum; Polygonum mite var. pachystachyum; Polygonum mite var. parviflorum; Polygonum mite var. rubellum; Polygonum mitis; Polygonum paludosum (heterotypic); Polygonum persicaria laxiflorum; Polygonum rosellum; Polygonum schurii; Polygonum schychowscii; Polygonum strictum laxiflorum