Input (grade 13): Several individual oak trees, such as the Royal Oak in Britain and the Charter Oak in the United States, are of great historical or cultural importance; for a list of important oaks, see Individual oak trees.
Output (grade 10): Most oak trees lose all of their leaves in autumn. Some kinds of oak tree, the "live oak", that grows in the American South or the Holm oak that grows in Europe keep their leaves through winter It is called the "live oak" in the United States of America because it keeps many of its leaves during winter.