Bloodroot in bloom

When bloodroot first comes up in the sping, it displays delicate little buttercup-type blooms for about a week. The flowers fall as the foliage opens up and fans out.
 
For more about bloodroot and native plants for the Midwest, especially those that do well in shade/moist areas, see the "book" on this website, Gardening with Native Plants in Shady Evanston.