FOREST TREES OF THE PACIFIC SLOPE. 



117 



eastern range. The long-maintained Abies lowiana Murray (cultivated in 

 England, where it was first described), the Abies concolor lowiana of American 

 authors, is a form of the white fir distinguished mainly by the length of its 



Fig. 43. — Abies concolor, lower branch. 



leaves. It is exceedingly difficult, however, to longer maintain, even as a variety, 

 a form based upon a character so clearly unstable. The cones (fig. 44) are 

 mature early in September, when they are very pale olive green with an ashen 



