| Description: | This alliance consists of riparian areas dominated by Abies grandis, usually with other conifers. Abies lasiocarpa, Larix occidentalis, Pinus monticola, and Pseudotsuga menziesii may be present to codominant. Betula papyrifera or Populus balsamifera ssp. trichocarpa sometimes form a scattered subcanopy. It occupies sites on benches, toeslopes or valley bottoms along mountain streams. The alliance occurs in the Rocky Mountains of western Montana, Idaho and eastern Washington and eastern Oregon, possibly extending into British Columbia Elevations range from 790-1410 m. |