The heights of the tallest trees in the world have been the subject of considerable dispute and much exaggeration. Modern verified measurements with laser rangefinders, other measuring devices, or with tape drop measurements made by tree climbers (such as those carried out by canopy researchers or members of groups like the U.S. Eastern Native Tree Society), have shown that some older measuring methods and measurements are often unreliable, sometimes producing exaggerations of 5% to 15% or more above the real height.
Historical claims of trees growing to 130 m (427 ft), and even 150 m (492 ft), are now largely disregarded as unreliable, and attributed to human error.
Historical records of fallen trees measured prostrate on the ground are considered to be somewhat more reliable. The following are now accepted as the top ten tallest reliably measured species:
1. Coast Redwood (Sequoia sempervirens): 115.56 m (379.1 ft), Redwood National Park, California, United States
2. Australian Mountain-ash (Eucalyptus regnans): 99.6 m (326.8 ft), south of Hobart, Tasmania, Australia
3. Coast Douglas-fir (Pseudotsuga menziesii): 99.4 m (326.1 ft), Brummit Creek, Coos County, Oregon, United States
4. Philippine rosewood (Petersianthus quadrialatus): 96.9 m (317.9 ft), Agusan del Sur, Mindanao, Philippines (it is possible that it is slightly lower, because the height might include Christmas decorations on the top of the tree)
5. Sitka Spruce (Picea sitchensis): 96.7 m (317.3 ft), Prairie Creek Redwoods State Park, California, United States
6. Giant Sequoia (Sequoiadendron giganteum): 94.9 m (311.4 ft), Redwood Mountain Grove, Kings Canyon National Park, California, United States
7. Tasmanian Blue Gum (Eucalyptus globulus): 90.7 m (297.6 ft), Tasmania, Australia
8. Manna Gum (Eucalyptus viminalis): 89 m (292 ft), Evercreech Forest Reserve, Tasmania, Australia
9. Shorea faguetiana: 88.3 m (289.7 ft) Tawau Hills National Park, in Sabah on the island of Borneo
10. Alpine Ash (Eucalyptus delegatensis): 87.9 m (288.4 ft), Tasmania, Australia Source
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