146 ILLINOIS ACADEMY OF SCIENCE 
dimorphism; in one fairly common and characteristic form, the 
yellow water-crowfoot Ranunculus delphinifolius Torr. we 
have indeed, during the high-water season, a stratified varia- 
tion; but there is a metamorphosis also, the plant during the 
dry season being represented by the so-called var. “terrestris,” 
River stages 
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