478 A HANDBOOK OF CONIFERS 



Var. caesia, Schwerin.^ 



Intermediate between P. Douglasii and P. glauca, distin- 

 guished from the former by its glabrous or very shghtly downy 

 branches, and greyish foHage, which is only shghtly fragrant, 

 and smaller cones ; and from P. glauca it differs chiefly in its 

 pectinate foliage and erect cone-scales. It extends throughout 

 the northern Rocky Mountain region of the Oregon Douglas fir. 



Va/. fastigiata, Cariiere. 



Branches erect, numerous, forming a compact p5rramid. 

 Leaves shorter ; buds large ; cones obtuse, red. 



Var. Fretsii, Beissner. 



Leaves short and broad, obtuse at the apex, resembling those 

 of a Tsuga or a silver fir. This peculiar form first appeared as 

 a seedling, and was distributed by Messrs. Frets, of Boskoop, 

 Holland. 



Var. nana, Hort. 



A dwarf, compact plant of bushy habit, suitable for the rock- 

 garden. 



Var. pendula, Engelmann. 



Branchlets excejDtionally long-and pendulous, slender with few 

 secondary branchlets. 



Var. revoluta, Hort. 

 Leaves curled. 



Var. Stairii, Hort. 



Foliage light golden yellow at first, becoming green in the 

 autumn. 



Var. Standishii, Masters. 

 Leaves silvery white below. 



Var. suberosa. 

 Bark very corky. 



Var. taxifolia, Carriere. 



Branchlets stouter, leaves longer and narrower than in the 

 typical form. Cones blunter, bracts shorter, scarcely exceeding 

 the scales in length. Recorded as a wild plant in Oregon. 



^ A manna composed of the rare sugar melezitose is found in considerable 

 quantity as a natural exudation on the foliage and branchlets of this variety in 

 British Columbia. American Forestry, Feb. (1920) and Scientific American, 165 

 (1920). 



