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Keywords from Image Description:
Callitriche heterophylla NRCS. en Callitriche heterophylla Pursh twoheaded waterstarwort usda gov tif USDANRCS PLANTS Database USDA NRCS Wetland flora Field office illustrated guide to plant species USDA Natural Resources Conservation Service Mark Mohlenbrock Wetland flora Field office illustrated guide to plant species USDA