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Northwest Conifers

    

Subalpine Fir – Abies lasiocarpa Speaker

Subalpine fir

Subalpine fir at Lookout Mountain

Map

USGS Distribution Map

Subalpine fir often grows at the timberline, where it is easily recognized by the narrow spire shape of its upper branches, a clear adaptation to heavy snowfall. Below the timberline, it can grow to over 150 feet (45 meters).

Needles: The needles curve upward in a uniform manner. They have white lines on both sides, two on one side and one on the other.  Pacific silver fir and noble fir also grow near the timberline, but Pacific silver fir has white lines only on the lower side of the needles, and noble fir has straight needles with a sharp curve where they attach to the twig.

Needles

Needle top and bottom

Cones: The purple cones sit upright on the branch and fall apart at maturity, leaving a cone core spike on the branch. The  cones often ooze a white resin. You won't find cones on the ground, but you might see some scales like this:

Scale


Where it grows: Subalpine fir grows in the Cascades and Olympics. It also grows throughout the Rocky Mountains and northward to Alaska. Although subalpine fir is shade-tolerant, it does not compete well with other conifers growing in the shade.

Uses: While it has few commercial uses, subalpine fir is an important component of the subalpine forest community, providing habitat for animals and protecting watersheds that provide our drinking water.

Names: Lasiocarpa means "hairy fruit," a reference to the fibers that protrude from the cone scales (not shown in photo). Other common names: alpine fir, white fir, balsam fir, and Rocky Mountain fir.

photo

photo

photo

Pollen cones

Subalpine fir


© 2011 Ken Denniston