There are no recognized subspecies or varieties. Cope, Amy B. 1992.
Brewer spruce is endemic to the Klamath region of northwestern California and adjacent Oregon.
It occurs occasionally as a codominant in some California red fir and western hemlock habitat types. The branching habit of Brewer spruce results in the wood having many knots, and it has little commercial value. Little information on volume or yield of Brewer spruce is available. Artificial propagation is best from seed. Brewer spruce is more susceptible to windthrow than its associates because of its shallow root system.