ABIES LASIOCAEPA HOOK. AND ITS ALLIES. 



137 



closely with the corresponding parts in the typical bifolia of 

 Murray. 



In his *' Synopsis of the American Firs" (Trans. Acad. St. Louis, 

 vol. iii. 1878; also Gard. Chron. u. s., vol. ix. 1878, p. 300), Engel- 

 mann reverts to this species, to which he refers [Pinus] A. lasiocarpa 

 of Hooker, and also Murray's Abies bifolia. It would seem then 

 that Murray's name has precedence over Engelmann's, and it is 

 difficult to understand why, when Engelmann had discovered this, 

 he did not ignore the name siibaljnna. Engelmann states that 

 Murray recognised the different forms of foliage on the tree, which 

 suggested the name given, but misapplied the scientific name. But 

 how Murray was in fault in this matter is not obvious. 





Type figure of A. suhalpina Engelmann, from Colorado. 



The leaf- structure of A. bifolia is essentially similar to that of 

 A. lasiocarpa, but the resin-canals are larger in diameter. 



Seeing that representatives of one or other of the three forms 

 now mentioned, occur at various elevations on a more or less 

 continuous mountain-range, parallel to, and at no great distance 



