' 103 



" 2. P. glauca Mayr. Rocky Mountains, Colorado to Mexico. 

 Branchlets variable in pubescence, often glaucous. Leaves thick, 

 rounded beneath, with strong turpentine odor. Cones 2 to 3 

 inches long, with reflexed bracts. 



" 3. P. macrocarpa Mayr. Southern California. Branchlets 

 variable in pubescence. Leaves thin, flat beneath, ending in a 

 cartilaginous i)oint. Cones very large. 3^ to 7 inches long, with 

 erect straight bracts." 



Of these P. macrocarpa has generally been admitted as a good 

 species. The Pacific coast tree, P. Douglasii or P. mucronata 

 proper, as far as it is represented in the herljarium of the New 

 York Botanical Garden, holds its characters very well. It may 

 be added that the bracts are comparatively longer and narrower 

 than in the Rocky ^Mountain species so that the lateral lobes ex- 

 tend to or beyond the cone scales. All our specimens from 

 Eastern British Columbia, northern Idaho, northwestern Mon- 

 tana and southeastern Washington agree with var. caesia, but 

 those of the Blue Moimtain region of Oregon are variable, the 

 cones and their bracts mostly as in the variety, but the cones in 

 some are somewhat larger and the twigs somewhat pubescent in 

 others. Our specimens from southern Wyoming, Colorado, 

 LTtah, Arizona, Xew ]\Iexico and northern [Mexico agree with P. 

 glauca, the branches being mostly more or less pubescent, though 

 in a few practically glabrous. In three specimens from New 

 Mexico and Arizona, the bracts are not reflexed, but unfortu- 

 nately all these are rather young, and the bracts may not become 

 reflexed except in age. In the Yellowstone Park and northern 

 Wyoming, the var. caesia and P. glauca seem to be mixed and 

 intergrading. To the reviewer it seems as if the West Coast 

 tree, P. mucronata were rather distinct, but that the var. caesia 

 were more related to P. glauca than to P. mucronata. The 

 authors do not mention anything concerning the odor of the 

 leaves of the var. caesia nor of the composition of its oil. To the 

 reviewer it seems more logical to regard even this as a distinct 

 species or else regard all three as geographical varieties of one. 

 A fourth species or variety may be represented by the specimens 



