White water crowfoot (Ranunculus aquatilis). In ponds and streams, Nova Scotia to British Columbia, south to North Carolina and Florida. Also in Europe and Asia (After Britton & Brown)
Khler's Medizinal-Pflanzen in naturgetreuen Abbildungen mit kurz erluterndem Texte :.Gera-Untermhaus :Fr. Eugen Khler,[1883-1914].biodiversitylibrary.org/page/303300