Douglas Fir 
(Pseudotsuga douglai) 
ORE Douglas Firs are doubtless planted 
than any other Fir. It is a tree which 
does exceptionally well over a large part 
of the United States, except in the extreme south. 
It is not uncommon to find an old specimen 
sixty feet or more, with a spread of branches up 
to twelve feet in diameter. The tree has a very 
commendable habit of retaining its lower limbs 
in old age, which attribute greatly adds to its 
beauty. 
There is considerable variation in the color of 
the foliage. Many trees are soft blue in color. 
Frequently, horticultural varieties are grown by 
which this characteristic is insured. When pro- 
duced from seeds, however, only a small number 
are of bluish color; the others range from light to 
dark green. 
It is a rapid grower and has long, graceful 
branches, less stiff than the Spruce. The foliage 
is not sharp and stiff, but soft, flexible, and also 
fragrant. It seems to thrive under conditions of 
shade better than most trees of this type and will 
stand considerable crowding. 
The value of Douglas Fir as an ornamental 
tree can hardly be overstated. It is an outstand- 
ing tree. 
(Illustrated at right) 
Cork or Arizona Fir 
(Abies arizonica) 
HIS tree gets its name from its very whit- 
ish, almost pure cork bark. In color it is 
one of the bluest of the Firs, rivaling the 
Blue Spruce. The underside of the needles is 
extremely whitish, or pale blue in color. It grows 
rather slowly and makes a narrow pyramid of 
unusual shapeliness. 
Its native home is in a small area in the Fran- 
cisco Mountains, in northwest Arizona. 

Cork or Arizona Fir 
A hedge or 
screen of 
Douglas Fir. 
Trees planted 
4 feet apart. 

