Figure 1.
The flower colour variations of different populations of E.acuminatum. A SCMP, mainly yellow B SCSL, mainly yellow, occasionally purple-yellow at the base of petals C CQNC, mainly yellow, occasionally rose-purple D SCSS, from yellow to purple E SCEM, mainly purple, occasionally purple-yellow F SCYJ, mainly purple, occasionally purple-yellow G Individual with yellow flowers H Individual with purple-yellow flowers I Individual with purple flowers.
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)
field image of Ranunculus abortivus SMALL-FLOWERED BUTTERCUP at the James Woodworth Prairie Preserve - a stand during bloom; due to small size and thin leaves, this species is difficult to see in its natural setting, unless a 'lone sentinel' specimen is found