Spring beauties are among the first wildflowers to bloom, and are often found in dense colonies.
Trout lilies are often seen in dense colonies as well.
Mayapples are sprouting, but I have not seen any in bloom yet. The flowers is attached to the stem, underneath the broad leaf.
I have trouble finding trillium in the woods so here are a few from a garden instead, starting with great white trillium.
Yellow trillium.
Sessile trillium or Toadshade.