Foothills, montane, subalpine. Woodlands. Spring.
Bear Creek Trail, October 10, 2008.

Neither a Fir nor a Spruce, Douglas Fir is more akin to Hemlock ("Pseudotsuga" means "false Hemlock" -- "Tsuga" is the Japanese name for Hemlock).  Douglas Fir is a magnificent tree usually growing on moist, shady, north-facing slopes, but it can also be found on rocky open slopes.  Pseudotsuga menziesii is common in cool mesa coves, foothills, lower mountains, and even in the subalpine zone of the Four Corners.  In the Four Corners mountainous areas it is a giant at 180 feet and five feet in diameter, but in Pacific coastal areas it reaches well over 250 feet tall and 8 feet in diameter. 

The above photograph centers on a Douglas Fir but it is flanked by Ponderosa Pines. The size of the trees can be estimated by noting the person with the orange hat in the lower left of the photograph.

Douglas Fir was formerly known as "Douglas Spruce", and thus came the name for the now famous "Spruce Tree House" of Mesa Verde National Park.  In the late 1880s the Wetherill brothers saw a large group of sandstone buildings tucked into a high and shallow cave in a canyon wall.  They shinnied down a "Douglas Spruce" to reach the buildings.

The specific epithet of the scientific name is for Archibald Menzies (1754-1842), Scottish botanist who collected leaves, cones, and seeds of this grand tree on Vancouver Island in 1791.  (More biographical information about Menzies.)

The common name is for David Douglas, widely acclaimed botanist and explorer in the early 1800s. Douglas was for a number of years thought to be the first collector of specimens of this tree. (More biographical information about Douglas.)

Foothills, montane, subalpine. Woodlands. Spring.
West Mancos Trail, June 24, 2008.

A few giant Douglas Firs remain in the Four Corners region.

Pseudotsuga menziesii variety glauca (Douglas Fir)
Pinaceae (Pine Family)

Foothills, montane, subalpine. Woodlands. Spring.
Lower Stoner Mesa Trail, September 5, 2007.

Douglas Fir bark is irregularly furrowed and dark gray with hints of orange in crevices. This giant tree is over four feet in diameter.

Pseudotsuga menziesii variety glauca (Douglas Fir)
Pinaceae (Pine Family)

Foothills, montane, subalpine. Woodlands. Spring.
West Mancos Trail, May 15, 2009 and Lower Calico Trail, August 26, 2011.

The underlying bark sometimes shows through with swirling patterns and colors other than gray.

Lower bark of older trees is commonly clothed with several lichen species.

Foothills, montane, subalpine. Woodlands. Spring.
Abajo Mountains, Utah, July 8, 2006.

Douglas Fir needles are flat, soft, shiny green, fragrant, and 1 to 1 ½ inches long.  New needles are light blue-green to light green.  Notice the narrow, pointed, reddish brown buds that are characteristic of Douglas Firs.

Foothills, montane, subalpine. Woodlands. Spring.
Knife Edge Trail, Mesa Verde National Park, June 21, 2015.
Lower Stoner Mesa Trail, May 26, 2004.

Pseudotsuga menziesii cones are distinctive, having bracts projecting from the cone; they appear to be little mouse hind legs and tails.  Douglas Firs are easy to identify: look at the cones scattered along the trail under the trees.