The Hart tree is a giant sequoia

Sequoiadendron

Sequoiadendron giganteum is the sole living species in the genus Sequoiadendron, and one of three species of coniferous trees known as redwoods, classified in the family Cupressaceae in the subfamily Sequoioideae, together with Sequoia sempervirens and...

 in California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

's Sierra Nevada. It was once claimed to be the fourth largest giant sequoia in the world but is now considered the 25th largest. The tree, which is named for Michael Hart who discovered it sometime around 1880, is in the Redwood Mountain Grove

Redwood Mountain Grove

Redwood Mountain Grove is the largest grove of giant sequoia on earth. It is located in Kings Canyon National Park and Giant Sequoia National Monument on the western slope of California's Sierra Nevada. The grove contains the world's tallest giant sequoia...

 of giant sequoias in Kings Canyon National Park

Kings Canyon National Park

Kings Canyon National Park is a National Park in the southern Sierra Nevada, east of Fresno, California. The park was established in 1940 and covers...

 and Sequoia National Forest

Sequoia National Forest

Sequoia National Forest is located in the southern Sierra Nevada mountains of California. The U.S. National Forest is named for the majestic Giant Sequoia trees which populate 38 distinct groves within the boundaries of the forest....

. Redwood Mountain Grove is the largest grove of giant sequoias in the world, and is the location of the tallest giant sequoia on earth (311 feet (94.8 m)) and the Roosevelt tree

Roosevelt (tree)

Roosevelt is the largest giant sequoia in Redwood Mountain Grove, which is itself the largest grove of giant sequoias on earth. It is located in Kings Canyon National Park and Sequoia National Forest, at in California's Sierra Nevada. The tallest giant sequoia on earth is also located in this...

 which is larger than the Hart tree.

Dimensions

Height above base	277.9	84.7
Circumference at ground	75.3	23
	21.3	6.5
	14.4	4.4
	12.9	3.9
	11.3	3.4
Estimated bole Trunk (botany) In botany, trunk refers to the main wooden axis of a tree that supports the branches and is supported by and directly attached to the roots. The trunk is covered by the bark, which is an important diagnostic feature in tree identification, and which often differs markedly from the bottom of the... volume	34407 ft3