Arbutus menziesii, often referred to as Madrone or Madrona, is an evergreen tree that grows up and down the Pacific coast from British Columbia to California.  I see them most often when I visit Orcas Island, one of the San Juan Islands, in Washington state.  Their outer bark is an orange-red that peels away naturally revealing a silvery-green under skin that is smooth to the touch.  This photo is of a knot hole surrounded by concentric layers of older bark.