1919] 



Hall-Goodsppfd : ( 7/ ri/sil 



195 



scattered groups of the plants as far west as the Coast Range moun- 

 tains, for example, San Benito County, Mt. Hamilton, Lake County, 

 Trinity County, etc. Four samples of moharensis from Mt. Hamilton 

 averaged only 0.53 per cent of Chrysil. 





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Fig. 1. ChrysoflKuiutiis iKtuseosiis var. riridulufi. Plant no. 468. Seven feet 

 liigh; growing in alkaline soil with Distichlis spicata and Ira axillaris. Artemisia 

 tridentata in background. (loat Ranch, north of Mono Lake, California. 



Coming now to the more important areas centering around the 

 Great Basin, we find that some of the densest stands and also the 

 largest plants are found in the alkaline deserts of Nevada and eastern 

 California. There are some large and important areas of the brush 

 in southern Colorado and in Utah, but the plants in these states are not 

 as good rubber producers as those farther west. Throughout the whole 



