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Spirodela polyrhiza 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. Spirodela polyrhiza Credit: Photo by Franco Giordana Spirodela polyrhiza Hippolyte Coste - Flore descriptive et illustrée de la France, de la Corse et des contrées limitrophes, 1901-1906 - This image is in public domain because its copyright has expired. Theft from a single author is plagiarism. Theft from two is comparative study. Theft from three or more is research. (Unknown)
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Research is what I'm doing when I don't know what I'm doing. (Wernher Von Braun)