Sequoiadendron

Sequoiadendron
	The General Grant tree in Kings Canyon National Park
Scientific classification
Kingdom:	Plantae
Division:	Pinophyta
Class:	Pinopsida
Order:	Pinales
Family:	Cupressaceae
Subfamily:	Sequoioideae
Genus:	Sequoiadendron; J.Buchholz
Species
	Sequoiadendron giganteum (Lindl.) J.Buchholz; † Sequoiadendron chaneyi;
Synonyms
	Steinhauera C.Presl; Wellingtonia Lindl. 1853, illegitimate homonym, not Meisn. 1840 (Sabiaceae); Americus Hanford, rejected name; Washingtonia Winslow 1854, rejected name, not H. Wendl. 1879 (Arecaceae) not Raf. ex J.M. Coult. & Rose 1900 (Apiaceae);

Sequoiadendron is a genus of evergreen trees, with two species, only one of which survives to the present:^[1]

Sequoiadendron giganteum, extant, commonly known as the "giant sequoia", growing naturally in the Sierra Nevada of California^[2]
† Sequoiadendron chaneyi, extinct, the predecessor of Sequoiadendron giganteum, found mostly in the Nevada part of the Tertiary Colorado Plateau until the late Miocene^[3]

Fossil record

Sequoiadendron pollen have been recovered from strata of early Pliocene until Günz glaciation of the Pleistocene in Western Georgia in the Caucasus region.^[4]

^ ^a ^b Kew World Checklist of Selected Plant Families
^ Biota of North America 2013 county distribution map
^ Daniel L. Axelrod, 1959. Late Cenozoic evolution of the Sierran Bigtree forest. Evolution 13(1): 9–23.
^ The History of the Flora and Vegetation of Georgia by Irina Shatilova, Nino Mchedlishvili, Luara Rukhadze, Eliso Kvavadze, Georgian National Museum Institute of Paleobiology, Tbilisi 2011, ISBN 978-9941-9105-3-1