| Description: | This alliance consists of mixed conifer forests characterized by Chamaecyparis lawsoniana codominant in the tree canopy with other conifers, most often with Pseudotsuga menziesii. Additional codominants include Tsuga heterophylla in northern stands and Picea sitchensis in coastal stands. It occurs in a very restricted range in the Klamath-Siskiyou mountain region of northern California and southern Oregon, but shows wide ecological amplitude within that range. Winters are cool and wet; summers are warm and dry. Coastal stands are usually associated with penetration of ocean fog events, and are particularly well-developed on moist toeslopes and valley bottoms of coastal river drainages. |