As I've pointed out before, for quite a few years, the five tallest species of trees in the world have been, in the following order:
1. Sequoia sempervirens, the Coast Redwood
2. Pseudotsuga menziesii, the Western Douglas-Fir
3. Picea sitchensis, the Sitka Spruce,
4. Sequoidendron giganteum, the Giant Sequoia
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