There is a difference in HopHornBeam and American Hornbeam... I'm lucky enuf to have both growing around my home.
- Eastern HopHornbeam is the one with a papery bark that appears as little vertical rectangles. The bark rectangles vary in size from 1/4" wide x 1" tall to 1/2" wide x 2" tall, depending on the tree. As mentioned above, it's prone to twisting, so look at the bark and it will show the twist in the vertical lines. The tree's "flowers" actually look like hops, but I wouldn't use them in my beer recipe...
- American Hornbeam is also known as Ironwood, Blue Beech, or Musclewood. It has a much smoother bark, and the tree can look like a well muscled arm or leg.
They both have a density rating of .70, but are fairly easy to work, and some propeller twist can be corrected by heating and using a crescent wrench to twist it into submission if you can't find a perfectly straight one.