Yellow Pond Lilies (Nuphar lutea) bloom earlier in Michigan than our White Water Lilies. Both native plants grow in ponds and slow moving streams throughout the United States and Canada. Yellow Pond Lilies are also known as Spadderdock.
I teach economics at Kalamazoo College. My wife is also an economist. We were on sabbatical in Europe for the 2014-15 academic year. (Salamanca, Spain, followed by Oxford, UK.) We were in Uruguay for the 2006-7 academic year.