1) Genus sequoiadendron 2) Giant sequoias 3) Plant genus 
Sequoiadendron is a genus of evergreen trees, with two species: ...
(from the article `forestry`) ...and southern Japan. Pines are the principal trees, along with cypresses (Cupressus and Chamaecyparis), cedars (Cedrus), and redwoods and mammoth ... ...and 44 species). Other highly local genera include Athrotaxis, Diselma, and Microcachrys in Tasmania, Fitzroya and Saxegothaea in Chile, ... ...leaves...
[n] - giant sequoias
genus Sequoiadendron noun giant sequoias; sometimes included in the genus Sequoia; until recently placed in the Taxodiaceae