List of plants of the Sierra Nevada (U.S.)

The Sierra Nevada's immense size in length and height, geological age, and wide variety of ecosystems and habitats present, make them home to one of the most diverse collections of distinct plant species in the United States.

The Sierras are bordered by: the Great Basin in rain shadow on the east; the Cascade Range on the north; the Central Valley—San Joaquin Valley on the west; the Tehachapi Mountains linking the Transverse Ranges on the southwest; and the Mojave Desert on the south.

In phytogeography, concerned with the geographic distribution of plant species, floristic provinces are used.

A descending hierarchy is used, with a realms at the top, then biomes, followed by smaller terrestrial ecoregions.

The Sierra Nevada are a small part of the North American continental Nearctic realm.