274 CONIFERS 



B. COTYLEDONS AS WELL AS PRIMARY LEAVES SER- 



RATULATE OR HAIRY. 



(1) All leaves single and isolated; cotyledons 

 and primary leaves tough. 



Picea excelsa, L. Spruce (Fig. 144). 



Fig. 144. Picea excelsa, Fig. 145. Pinus Pinea, 



Spruce, f (E.D.). Stone Pine (E.D.). 



(2) Primary single leaves succeeded in the 

 second year by 2- to 5 -leaved shoots. 



(a) Second year shoots bearing 2-leafed tufts ; seedling 

 and cotyledons very tough. 



Pinus Pinea. Stone Pine (Fig. 1 45). 



(b) Second year shoots bearing 5-leaved tufts, 

 (i) Seedling and cotyledons tough. 



Pinus Cembra. Arolla Pine (Fig. 146). 



