17. Tsuga heterophylla

Western Hemlock is an elegant N.W. American tree growing up to 82metres (270 feet) tall. This specimen is 25-27 metres (85-90 feet) tall. They have a distinctive drooping lead shoot. Some trees of the species have been known to reach 1200 years old. They are cultivated as ornamental trees in large gardens. The bark serves as a source of tannin for tanning.