Vine Maple: Acer circinatum
Douglas Maple, Rocky Mountain Maple: Acer glabrum var. douglasii (Synonyms: Acer douglasii, Acer glabrum ssp. douglasii, Acer subserratum)
Mountain Maple, Rocky Mountain Maple: Acer glabrum var. glabrum
Torrey's Maple: Acer glabrum var. torreyi
Bigleaf Maple, Big-leaf Maple: Acer macrophyllum - Large tree.