Meadow anemone veining

Detailed veining on the leaves of meadow anemone (Anemone canadensis), a/k/a Canadian anemone, windflower, or round-headed thimbleweed, a native perennial wildflower of the buttercup family.
 
For more about meadow anemone 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.