Most of the Rogue River watershed is in the Klamath Mountains ecoregion designated by the EPA, although part of the upper basin is in the Cascades ecoregion, and part of the lower basin is in the Coast Range ecoregion. Temperate coniferous forests dominate much of the basin. The upper basin, in the High Cascades and Western Cascades, is in places identified as containing extremely high species richness within many groups of plants and animals. Common tree species in the forests along the upper Rogue include incense cedar, white fir, and Shasta red fir.