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Polygonaceae family

Persicaria punctata (Elliott) Small, Fl. S. E. U. S. 379.  1903.
Bas.: Polygonum punctatum Elliott (1817).
 
Indigenous quite common herb of fresh-water swamps at low elevations.
Guadeloupe, Marie Galante, Martinique, St. Lucia, St. Vincent, rest of West Indies, North America, Mesoamerica, South America.