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- © 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.
- Copyright licence: Marked as being in the public domain
- Provenance: http://media.eol.org/content/2014/06/12/19/61939_orig.jpg