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- © Robert H. Mohlenbrock. USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National Technical Center, Chester. Courtesy of USDA NRCS Wetland Science Institute.
- Copyright licence: Marked as being in the public domain
- Provenance: http://media.eol.org/content/2014/10/06/01/16071_orig.jpg