Synonyms recognized by ITIS (bold taxon is currently accepted):

     Polygonum amphibium var. emersum Michx.
     Persicaria amphibia (L.) S.F. Gray p.p.
     Persicaria amphibia var. emersa (Michx.) Hickman
     Persicaria coccinea (Muhl. ex Willd.) Greene
     Persicaria muehlenbergii (S. Wats.) Small
     Polygonum amphibium var. coccineum (Muhl. ex Willd.) Farw.
     Polygonum coccineum Muhl. ex Willd.
     Polygonum coccineum var. pratincola (Greene) Stanford
     Polygonum coccineum var. terrestre Willd.
     Polygonum muehlenbergii S. Wats.
     Polygonum muehlenbergii var. terrestre (Willd.) Trel.

Common Name(s): colored smartweed, devil's shoestring, longroot smartweed, swamp smartweed, tanweed.

Taxonomic Hierarchy: (ITIS TSN=529773, click for more information and references)

        Kingdom: Plantae
            Subkingdom: Tracheobionta
                Division: Magnoliophyta
                    Class: Magnoliopsida
                        Subclass: Caryophyllidae
                            Order: Polygonales
                                Family: Polygonaceae
                                    Genus: Polygonum
                                        Species: Polygonum amphibium
                                            Variety: Polygonum amphibium var. emersum