This is yellow sweetclover (Melilotus officinalis), very common in open areas. This is on the flood plain of White River at White River State Park, Indianapolis, May 23, 2003. This yellow form starts flowering about mid-May. Later you start seeing sweetclover with white flowers until by mid- June all the sweetclover that you see is white. Most authorities consider the white and yellow forms to be different species but I rather suspect they are the same plants that just change their color during the season. You'd have to follow it really closely to know for sure.
Link to Melilotus officinalis:
Link to Melilotus officinalis:
Link to Melilotus officinalis:
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