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Marsilea quadrifolia
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: 37.
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Marsilea quadrifolia
Otto Wilhelm Thomé: Flora von Deutschland, Österreich und der Schweiz (1885) - Permission granted to use under GFDL by Kurt Stueber. Source: www.biolib.de
Permission is granted to copy, distribute and/or modify this image under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".
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Marsilea quadrifolia
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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European water-clover
European waterclover
Trifoglio acquatico comune
Water Clover
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