68 



ABIES, OR SILVER FIRS 



Numidica, in which they point backwards, point for- 

 wards); (c) whether these median leaves arise from the 

 branchlets straight up, as, for instance, in A. Ama- 

 bilis, or whether they are at first appressed — that is 

 to say, adhere for the first part of their length to the 

 branchlets — before shooting up in a forward direction 

 from the stem, as in the A. Nobilis and Magnifica ; 

 (d) apex of leaf, whether sharply bifid (as e.g. Firma, 

 Homolepis, Webbiana, etc.), or emarginate, or less 

 sharply and more obtusely notched (as e,g, Pectinata, 

 etc.), or whether entire, with unbroken margin (as 

 e.g, Nobilis, Concolor, Magnifica, Lasiocarpa, Re- 

 ligiosa) ; or whether the apex is rounded, obtuse, 

 truncate, acute, or spine-tipped, as in Bracteata. 



Apex 

 Entire 



Apex Apex 



Rounded Truncate 

 notched notched 



^ ill i 



Apex Apex 



Spine Acute 



tipped 



Concolor 

 Lasiocarpa 

 A. Relig^iosa 



NobiUs 

 Magnifica 



Stomata. — Whether they show white stomatiferous 

 bands on one side of the leaf or on both sides, as do 

 the Spruces (Piceae) upon all sides. The Silver Firs 

 (Abies) are rarely stomatiferous on both sides of the 

 leaf, and in instances where tfiey are, often not 

 whole-heartedly but in broken bands, or only on the 

 leaves of the higher boughs. 



The following are the exceptions among Silver Firs 

 that show stomata on both sides of the leaf : Lowiana, 

 Concolor, Lasiocarpa, Arizonica, Nobilis, Magnifica, 

 Numidica, and Pinsapo, also the Cephalonica — but 

 inconspicuously, except with the aid of magnifying 

 glasses. I should like to add to these the A. Sacha- 

 linensis, although it does not generally appear to be 



