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According to Official Guinness Records,
The tallest tree currently growing is Hyperion, which measured 115.85 m in 2009. This coast redwood Sequoia sempervirens was discovered by Chris Atkins and Michael Taylor (both USA) in the Redwood National Park, California, USA, on 25 August 2006. The initial measurement read a height of 115.24 m (378.1 ft). However, it was measured again by Dr Steve Sillett, Mike Taylor, Chris Atkins and Robert van Pelt in September 2006 by climbing it and dropping a tapeline, obtaining a height of 115.54 m (379.1 ft).Remarkably, Hyperion is situated on a hillside (not alluvial flat), 96% of the surrounding area of which has been logged of its original coast redwood growth. Atkins and Taylor had just earlier (1 July 2006) discovered two other coast redwoods in the same park, both of which also beat the previous holder, Stratosphere Giant. Their initial measurements concluded that: Helios measured 114.69 m (376.3 ft) and Icarus, 113.14 m (371.2 ft). However, in 2009 Helios's height was readjusted to 114.58 m, with Icarus's height unchanged.
For a complete list of 2009 records, please visit 2009 Guinness Records in United States.