Water clover (Marsilea quadrifolia). Found along the shores of Bantam Lake, Litchfield County, Conn., whence it has been introudced into various parts of the country, notably eastern Massachusetts. Native of Europe and Asia (After Britton & Brown)
Plantarum indigenarum et exoticarum icones ad vivum coloratae, oder, Sammlung nach der Natur gemalter Abbildungen inn- und ausländlischer Pflanzen, für Liebhaber und Beflissene der Botanik /.
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biodiversitylibrary.org/page/44510361
The British ferns, or, Coloured figures and descriptions with the needful analyses of the fructification and venation of the ferns of Great Britain and Ireland
London :Lovell Reeve,1861.
biodiversitylibrary.org/page/51658923
