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Spirodela polyrrhiza
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 1: 446.
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Spirodela polyrrhiza
Robert H. Mohlenbrock USDA-NRCS PLANTS Database / USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento. - Not copyrighted image
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Spirodela polyrrhiza
Robert H. Mohlenbrock USDA-NRCS PLANTS Database / USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento. - Not copyrighted image
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common duckmeat
common duckweed
greater duckweed
Lenticchia d'acqua maggiore
Spirodela polyrrhiza var. masonii
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