1917.] 



NATIVE WALNUTS OF CALIFORNIA 



55 



THE NATIVE WALNUTS OF CALIFORNIA 



Willis Linn Jepson 



A good many years ago, while looking over the interesting maps 

 which accompany Sargent's Report upon the Forest Trees of the 

 United States for the Tenth Census, I was much struck by the band 

 of color extending from the Pacific Ocean to the borders of the San 



Fig. 27. The leaf marked a belongs to Juglans Calif omica, or the South- 

 ern California Walnut, which grows on dry hillsides. The leaflets are 

 rather obtuse and often crowded, as shown in the figure. The leaf marked 

 o, with the leaflets more pointed and less crowded, is typical of Juglans 

 Hindsii, the Central California Walnut, which commonly grows along 

 streams, and always in deep rich moist valley or bench soil. Juglans Cali- 

 f omica is distributed from Santa Barbara County to Orange County and 

 east to the foothills of the San Bernardino Mountains. Juglans Hindsii is 

 known to occur on Walnut Creek, the lower Sacramento Eiver, near Mt. 

 Atlas in Napa County, and in Gordon Valley west of the Vaca Mountains. 

 Drawing by Dr. Helen M. Gilkey. About % natural size. 



