Birch trees are probably most noted for their bark. Some are white and smooth while other species exfoliate (peel off) and of differing colors. Most birches also produce bright yellow leaves in the fall.
Betula alleghaniensis aka Yellow Birch Betula maximowicziana aka Monarch Birch Betula nigra aka River Birch Betula papyrifera aka Paperbark or Canoe Birch Betula platyphylla aka Asian White Birch Betula populifolia aka Royal Frost Birch Betula utilis aka Birch