94 University of California Puhlicaiions . [botany 



RHAMNACEJ^. 



Ceanothus cordulatus Kell. Buck-brush. 



This is an important shrub of the chaparral formation of the 

 higher altitudes. It is occasionallj' found as low as 5000 ft., but 

 is more characteristic of the Upper Transition Zone and barely 

 enters the Canadian at 9300 ft. alt. On the higher ridges, which 

 receive a large amount of snow in winter, the specimens often 

 become exceedingly depressed and twiggy. Bushes from a single 

 root will sometimes spread out over an area 15 ft. in diameter, 

 meanwhile rising only a couple of feet from the ground. In 

 these cases the small twigs are so numerous that the whole sur- 

 face is smoothed over with the small, gray leaves, giving to the. 

 whole the appearance of an immense sofa pillow. (No. 721.) 



Ceanothus cuneatus Nuti. Nuttall's Ceanothus. 



Enters the lower part of the pine lielt on the Johnston 

 Ranch, etc. 



Ceanothus divaricatus Nuii. Mountain Lilac. 



This is a foot-hill species, but is found in the lower part of 

 the pine belt on the south and west sides. On hill-tops near its 

 upper limit it becomes low and scrubby, taking on the habit of 

 normal C. cordulatus. All the flowers seen were blue. (No. 

 2223.) 



Ceanothus integerrimus fl". tf- ^1. Deer Brush. 



Of higher range than the last, beginning with the pines and 

 running through the Low^er Transition Zone. (No. 775.) 



Ceanothus perplexans Trelease, Syn. Fl. i. pt. 1, 417 (1897). 

 This Sonoran species is very common around the south-east 

 base of the mountain and was found beneath the pines at a few 

 places in Thomas Valley. 



Rhamnus Californica tomentalla B. & T^^ Coffee Berry. 



Found only on the south and west sides, where it rarely 

 ascends to 8000 ft. alt. (No. 2261.) 



Rhamnus crocea ilicifolia (KcU.) Greene, Fl. Fr. 79 (1891). 



This foot-hill shrub was found extending into the pine forests 

 of the south side. It was quite rare, however, and did not get 

 above the 6000-foot contour. 



