38 WEST AMERICAN OAKS. 



Habitat. The mountains of Lower California, where it is associated with the rare 

 and characteristic Q. Duiinii; also within the borders of the State of California about 

 Campo, in San Diego County. 



Remarks. This peninsular scrub oak was collected by the writer in the mountains 

 of San Diego County as long ago as 1877. The specimens, exhibiting nothing but the 

 leaves, were referred by Dr. Engelmann somewhat doubtfully to Q. diimosa. Mr. Dunn's 

 excellent specimens, obtained some twenty or thirty miles below the United States boun- 

 dary in September, 1888, are laden with full grown fruit, and with the acorns and their 

 very characteristic thin-walled flat-scaled turbinate cup leave no doubt that the species is 

 distinct from all the West American bush oaks hitherto defined. Even the foliage is suffi- 

 ciently unlike that of Q. dicmosa; and the same may be said of the whole bearing and as- 

 pect of the shrub. Its relation to that species is about such as its geographical associate, 

 Q. Dunnii^ sustains to Q. chrysolepis. 



