Decodon verticillatus
PlantsFamily: Lythraceae · Genus: Decodon

Robert H. Mohlenbrock. USDA SCS. 1989. Midwest wetland flora: Field office illustrated guide to plant species. Midwest National Technical Center, Lincoln. Courtesy of USDA NRCS Wetland Science Institute. · public_domain
About
Decodon verticillatus, the sole living species in the genus Decodon, is a flowering plant in the family Lythraceae. It is commonly known as waterwillow or swamp loosestrife. It is native to wetlands in the eastern half of the United States and Canada.
Summary from Wikipedia
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Growing details and traits for Decodon verticillatus in the Library.
No cultivars in the Library yet — the full profile above covers the species itself.