FLORA OF THE TUSAYAN NATIONAL FORKS'!' 



115 



trees. On some of the north slopes the spruce grows so densely 

 as to exclude almost all other vegetation. Reproduction of 

 all tree species is very thick throughout the entire zone. Be- 



Fig. 2. Transition Zone. A heavy stand of Aristida arizonica in the fore- 

 ground under Pi7ius ponder osa. 



cause of the dense shade here there is less grass than in the 

 lower zones; both in species and quantity. An exception is 

 found on the bald knolls and in the few small parks where bunch 

 grass (Festuca arizonica) grows luxuriantly. Several species of 

 bromus grow well here. Poa spp., Melica parviflora, Festuca 



