Keywords: FMIB 47805 Greater duckweed (Siprodela polyrhiza).jpeg check categories 19 August 2015 2 Greater duckweed Siprodela polyrhiza Found in rivers ponds pools and shallow lakes Nova Scotia to British Columbia south to South Carolina Texas northern Mexico and Nevada Widely distributed in the Old World and tropical America After Britton Brown Subject Duckweeds Tag Aquatic Botany 1924 00 Cite book Aquatic Plants in Pond Culture Titcomb John W Washington DC Government Printing Office 1924 Report of the United States Commissioner of Fisheries for the Fiscal Year 1923 with Appendices Fig 16 Creator John Wheelock Titcomb PD-UWASH-FMIB Institution University of Washington FMIB-source accession number 47805 Images from the Freshwater and Marine Image Bank to check John Wheelock Titcomb Lemnaceae |