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)
Description: English: Botanical specimen in the Marie Selby Botanical Gardens - Sarasota, Florida, USA. Date: 20 March 2017, 14:04:10. Source: Own work. Author: Daderot.
Description: English: Marsilea villosa, in the United States Botanic Garden, Washington, DC, USA. Date: June 2008. Source: Own work. Author: Daderot. Permission(Reusing this file): Public domain.