Synonyms: Persicaria acris (heterotypic); Persicaria erecto-minor koreensis; Persicaria erectominus var. koreensis; Persicaria hydropiper hispida; Persicaria hydropiper laetivirens; Persicaria hydropiper maximowiczii; Persicaria hydropiper var. angustifolia; Persicaria hydropiper var. densiflora; Persicaria hydropiper var. fastigiata; Persicaria hydropiper var. longistachya; Persicaria hydropiper var. projecta; Persicaria koreensis; Persicaria koreensis f. viridiflora; Persicaria maximowiczii; Persicaria urens; Persicaria vernalis; Peutalis hydropiper (homotypic); Polygonum acre (heterotypic); Polygonum glandulosum (heterotypic); Polygonum gracile (heterotypic); Polygonum hecasanthum; Polygonum hydropiper (heterotypic); Polygonum hydropiper diffusa; Polygonum hydropiper f. densiflorum; Polygonum hydropiper f. irramosum; Polygonum hydropiper f. nanum; Polygonum hydropiper f. nivrense; Polygonum hydropiper f. ramosissimum; Polygonum hydropiper f. simplex; Polygonum hydropiper f. submersum; Polygonum hydropiper f. viridialbum; Polygonum hydropiper f. viridirubellum; Polygonum hydropiper laetivirens; Polygonum hydropiper longistachyum; Polygonum hydropiper megalocarpum; Polygonum hydropiper var. angustifolium; Polygonum hydropiper var. carpaticum; Polygonum hydropiper var. densiflorum; Polygonum hydropiper var. micranthum; Polygonum hydropiper var. obtusifolium; Polygonum hydropiper var. pauciflorum; Polygonum hydropiper var. projectum; Polygonum hydropiper var. remotum; Polygonum hydropiper var. tenue; Polygonum hydropiper var. viridialbum; Polygonum hydropiper var. viridirubellum; Polygonum hydropiper var. vulgare; Polygonum hydropiper vulgaris; Polygonum koreense; Polygonum koreense viridiflorum; Polygonum maximowiczii; Polygonum mite (heterotypic); Polygonum obtusifolium (heterotypic); Polygonum oleraceum; Polygonum schinzii (heterotypic); Polygonum vayredae; Polygonum vernale