Great question, I learned about this when I was in 3rd grade class. The largest tree in the world has been recorded to be the Sequoia. However, I found this under the name Sequoiadendron in wikipedia, perhaps to differentiate the class and division of their family.
Quoted from Wikipedia:
"Giant Sequoias are the world's largest trees in terms of total volume (technically, only 6 living Giant Sequoia exceed the 42,500 cubic feet (1,200 m3) of the Lost Monarch Coast Redwood tree; see Largest trees). They grow to an average height of 50-85 m (165-280 ft) and 6-8 m (18-24 ft) in diameter. Record trees have been measured to be 94.8 m (311 ft) in height and 17 m (57 ft) in diameter. The oldest known Giant Sequoia based on ring count is 3,500 years old.
The natural distribution of giant sequoia is restricted to a limited area of the western Sierra Nevada, California. It occurs in scattered groves, with a total of 68 groves (see list of sequoia groves for a full inventory), comprising a total area of only 14,416 ha (144.16 km² or 35,607 acres). Nowhere does it grow in pure stands, although in a few small areas stands do approach a pure condition. The northern two-thirds of its range, from the American River in Placer County southward to the Kings River, has only eight disjunct groves. The remaining southern groves are concentrated between the Kings River and the Deer Creek Grove in southern Tulare County. Groves range in size from 1,240 ha (3,100 acres) with 20,000 mature trees, to small groves with only six living trees. Many are protected in Sequoia and Kings Canyon National Parks and Giant Sequoia National Monument."
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