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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.
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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.
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giant duckweed
great duckweed
Lenticchia d'acqua maggiore
spirodèle polyrhize
water flaxseed
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