CHAP. XII. ] ABIETINE^. 207 



leaves are also placed nearly in two rows, one on 

 each side the branch ; Larix, the Larch, the 

 leaves of which are very slender and produced in 

 tufts, but which fall off every winter; andCedrus, 

 the Cedar, the leaves of which resemble those 

 of the Larch, but which do not fall off every 

 winter. The distinctions between these genera 

 in the leaves only are very clear, and easily re- 

 membered ; and their cones differ as decidedly: 

 those of the Pines are hard and thick at the 

 tips of the scales, which remain on after the 

 seed drops ; those of the Spruce Firs are thin 

 at the tips of the scales, which also remain on 

 the cones after they have lost their seeds, and 

 the cones are drooping, and tapering at both 

 ends ; those of the Silver Firs are erect, cylin- 

 drical, and of nearly the same diameter through- 

 out, and the scales fall with the seeds ; those of 

 the Larch are erect, but small and conical, and 

 the scales remain on after the seeds have fallen; 

 and those of the Cedar are erect, oval, and with 

 deciduous scales. To the hardy genera may 

 now be added Araucaria, as one species of this 

 genus (A. imbricata) has been found quite hardy 

 in Britain. 



The Cupressinese are divided into four or five 

 genera; viz., Thuja^ the Arbor Vitse, some of the 

 species of which have been formed into a new 

 genus under the name of Callitris ; Ciipressus, 



