2022年9月27日 · The American hornbeam (Carpinus caroliniana) is a deciduous hardwood shade tree that's native to eastern North America.It is part of the Betulaceae (birch) family and has several nicknames, including blue beech, muscle beech, water beech, muscletree, musclewood, and ironwood. The reference to muscle relates to the tree's characteristic fluted trunk and branches that look like muscle tissue.