Acer macrophyllum is one big-leafed maple. Also known as Oregon Maple, these trees of the moist, shady canyons of the Coast Range can have leaves 9″ or more long. The leafstalk can be up to a foot long. 
Just wow!
And, speaking of wow, check out this intersection of the great naturalist David George Haskell with his state’s loathsome plutocratic toady of a Senator in the woods.
Backyard and Beyond 
Wow is right! Beautiful