Hemlocks are noted for short needles and droopy tops and branches. There are only about 10 species of hemlock in the world--mostly in North America, China, and Japan. The Pacific Northwest has two hemlocks: the abundant and commercially important western hemlock and the lesser known mountain hemlock. Even when found growing together, they're easy to tell apart.
: needles are blue-green on all surfaces, are similar in size, and are uniformly arranged around the twig. Clusters of needles often have a star-like appearance. Cones are cylindrical and are 1 to 3 inches long.
: needles are all very short, but have distinctly different sizes on the same twig. They are yellow-green on top, and have two white bands on their undersides. They tend to stick out the sides of the twigs, but also occur on top of the twig. Cones are egg-shaped and about 1 inch long.
trees by common name trees by scientific name dichotomous key mystery tree
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