Polygonum rigidulum
- Polygonum rigidulum E.Sheld. in Minnesota Bot. Stud. 1: 14 (1894), nom. illeg. homonym. post. vide Persicaria coccinea (Muhl. ex Willd.) Greene in Leafl. Bot. Observ. Crit. 1: 24 (1904)
- Polygonum rigidulum Gand. in Rev. Bot. Bull. Mens. 1: 90 (1882) vide Persicaria amphibia var. amphibia
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