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2013), which may comprise three or more genera, depending on the including of Zannichelliaceae (Haynes and Holm-Nielsen, 2003; APGIII 2009; Kaplan et al.
Hyd Zannichelliaceae Althenia filiformis Petit Hyd Chorological type Pteridophyta Equisetaceae Equisetum arvense L.
1 ZANNICHELLIACEAE (Horned Pondweed Family) Zannichellia palustris L.