BULLETIN 



or THE 



Souitiern Galllornla flcadeniy ol Sciences 



VOL. \ LOS ANOCLCS, CAL, JAN. I, 1904. NO- I 



]FM>r 



Quercus Wislizeni in Southern California. 



BY LEROY ABRAMS. 



In a former article in this publication (1:89, 1902) I had 

 occasion to mention the occurrence of Quercus Wislizeni A. 

 DC. in Southern California. Since then INIr. Parish in a later 

 number of this publication (11:11, 1903) doubts the determina- 

 tion of my specimens, at least as far as the plants from San 

 Bernardino Mountains are concerned. He says: "I have been 

 unable to detect it in the San Bernardino Mountains, and speci- 

 mens from that station with which Mr. Abrams has obliged me, 

 while indecisive, appear rather to belong to Q. dumosa, the com- 

 mon scrub oak of the region." That this species should be con- 

 fused with Q. dumosa can hardly be understood for they have 

 nothing in common save that both, in our region, are shrubby. 

 This confusion seems to exist, hoAvever, and for that reason it 

 may be proper to point out some of the ditferences. The leaves 

 of Q. dumosa, as it is now understood, are variable, but they are 

 usually blunt and more or less short pubescent and grayish be- 

 neath, while those of Q. Wislizeni are usually pointed, a bright, 

 glossy green and smooth on both surfaces. These characters 

 make them easily distinguished in the sterile condition. In the 

 fruit the characters are still more pronounced. Q. dumosa, be- 

 ing a white oak, has usually blunt acorns and more or less tu- 

 bereulate cups, caused by the thickened scales. Q. Wislizeni, 

 on the other hand, is a black oak and has pointed acorns and 

 deep cups composed of thin scales, much resembling those of 

 the well-known Q. agrifolia, to which species it is much more 

 nearly related. This can be distinguished from both Q. dumosa 



