are approximately 825 native
and naturalized species of trees in the United
The oldest living tree is believed to be a California
bristlecone pine tree named Methuselah, estimated
to be 4700 years old.
world's largest known living tree, the
General Sherman giant sequoia in California,
weighs as much as 41 blue whales or 740 elephants, about
In about 1638, Galileo Galilei
(1564-1643) suggested that trees could grow only to be
about 300 feet tall
because of factors involving form and materials.