Keywords: Callitriche heterophylla NRCS-1.png en Callitriche heterophylla Pursh - twoheaded water-starwort 1992 http //plants usda gov/gallery/pubs/cahe3_004_pvd tif USDA-NRCS 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 Natural Resources Conservation Service Provided by NRCS National Wetland Team Fort Worth TX PD-USGov Uploaded with UploadWizard Callitriche heterophylla - botanical illustrations Wetland flora Field office illustrated guide to plant species |