264 THE CULTIVATED EVERGREENS 



inches long: staminate catkins orange, the fertile ones reddish: cones pen- 

 dulous, oval-ovoid, 2-43^ inches long, with broad rounded scales and much 

 exserted bracts; seed 34 inch long, with broad wing, light reddish-brown. 

 From British Columbia to California, Montana, Colorado, western Texas, 

 and northern Mexico. — Introduced in 1827 to Great Britain by David 

 Douglas. In its Rocky Mountain form it is hardy as far north as southern 

 Ontario and New England and is growing well in the Eastern States; it 

 forms a pyramidal tree of dense yet graceful habit. A number of distinct 

 forms are in cultivation. 



Var. viridis, Asch. & Graebn. (A. Douglasii viridis, Schwerin). This is 

 the typical green-leaved form from the coast region; it is of rapid growth and 

 more open habit than the Rocky Mountain form, but tenderer. 



Var. caesia, Asch. & Graebn. (P. Douglasii coesia, Schwerin), agrees with 

 the type except that the leaves are bluish-green; it seems to be somewhat 

 hardier. 



Var. brevibracteata, Asch. & Graebn. (P. Douglasii taxifolia, Carr.), 

 Smaller tree: leaves longer and darker: bracts of cone shorter. 



Var. glauca, Sudw. (P. Douglasii glauca, Mayr. P. glauca, Mayr). 

 Blue Douglas F. Of more compact habit; branches more ascending: 

 leaves shorter, bluish-green: cones smaller, with often reflexed bracts. This 

 is the Rocky Mountain form which is hardier than the type, but of slower, 

 more compact growth. In northern Arizona and New Mexico a form of this 

 variety with gray, thick and corky bark occurs (var. suherosa, Lemm.). 



Var. argentea, Sudw. (P. Douglasii argentea, Koster). Silver Douglas 

 F. Similar to the preceding, with almost silvery-white foliage. 



Var. Fretsii, Rehd. (P. Douglasii Fretsii, Beiss.). Frets Douglas F. 

 Leaves short and broad, about 3^ inch long, obtuse at apex. 



Var. pendula, Sudw. {P. Douglasii pendula,'Enge\m.). Weeping Douglas 

 F. With pendulous branches and dark green foliage. Var. "glauca pendula," 

 Schneid. (P. Douglasii glauca pendula, Beiss.). With pendulous branches 

 and bluish-green or bluish-white foliage. 



Var. fastigiata, Sudw. (P. Douglasii fastigiata, Carr.). A narjow conical 

 pyramid, with ascending branches and shorter leaves. 



Var. compacta, Sudw. A compact conical form with short and dense foliage. 



Var. globosa, Asch. & Graebn. (P. Douglasii glohosa, Beiss.). A dwarf 

 globose form. 



The following three species are not or very little known in cultivation: 



P. macrocarpa, Mayr (P. Douglasii var. macrocarpa, Engelm.). Bigconb 

 Spruce. Closely related to P. taxifolia: a smaller tree with more remote 

 and usually pendulous branches: leaves acutish, curved, bluish-green: cones 

 4-63^2 inches long, with slightly exserted upright bracts. Southern C9,li- 

 fornia. — Apparently not yet introduced into cultivation. 



