Sequoia Trees, Redwood National And State Parks, California, United States

Sequoioideae is a subfamily in the family Cupressaceae, with three genera.
Genera
The three redwood subfamily genera are: Sequoia and Sequoiadendron of California and Oregon, USA; and Metasequoia in China. The redwood species contains the largest and tallest trees in the world. These trees can live to an age of thousands of years. This is an endangered subfamily due to habitat losses from: fire ecology suppression, development, and air pollution.