THE BROAD-SCLEROPHYLL VEGETATION OF CALIFORNIA. 



35 



made, but a statistical quadrat of 5 meters square gave the following 

 results : 



Clumps. 



Adenostoma 98 



Arctostaphylos 4 



Total 102 



Quercus durata is rather frequent in the vicinity and Heteromeles 

 arbutifolia and Quercus wislizeni also occur. Undergrowth is hardly 

 more noticeable than in station 1 . There is practically no humus and 

 very scanty litter. 



Station 3. 



A short distance north of station 2 a moderate slope begins, which 

 extends downward for a distance of 75 meters to the bottom of a 

 shallow ravine. From the summit for a little distance downward, 



X-Ar 



Qd 



Ar 



Qd 



Ar 



8 i 



H H 



Ar 



Ar < 

 A 



Ar 



Qd 



Ar 



A Ar 



Ar 



Ar 



Ar 



Ar 



Ar 



Ar 



Ar 



Ar 



Qd 



Ar 



Fig. 3. — Quadrat at station 3, 5 meters square. Note fewness of 

 individuals, mostly Arctostaphylos, which nevertheless 

 thoroughly control the area. 



Adenostoma is predominant, but a gradual change is noted, until 

 the lower half is seen to be dominated by Arctostaphylos and Quercus 

 durata, with Adenostoma a decided minority. The size of the shrubs 

 also increases gradually, until near the bottom of the slope they 

 average 2 meters in height. The density is such that the ground is 

 entirely dominated, and the only way to travel is on one's hands 

 and knees below the zone of tightly intertangled branches. The 



