Keywords: Myriophyllum heterophyllum NRCS-2.jpg en Myriophyllum heterophyllum Michx - twoleaf watermilfoil 1995 http //plants usda gov/java/largeImage imageID myhe2_002_avp tif Robert H Mohlenbrock USDA-NRCS PLANTS Database / USDA NRCS 1995 Northeast wetland flora Field office guide to plant species Northeast National Technical Center Chester 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 PD-USGov Myriophyllum heterophyllum Photographs by Robert H Mohlenbrock Uploaded with UploadWizard |