OCT., 1809] PLANTS. 153 



Acer macrophyllum Pnrsli. Oregon Maple; Biy" leaf Maple. 



The tree maple is rare iu the region about Shasta, where it was 

 observed only in moist places in the lower part of the Transition zone 

 near Sisson and in the upper part of the Sacramento Canyon. 



Acer glabrum Tori-. Bush Maple. 



Fairly common in McCloud Valley and in moist places along streams 

 and canyons in the Transition zone. In Mud Creek Canyon it was 

 found i\\) to an altitude a little above 5,600 feet, and along Squaw Creek 

 to nearly 0,000 feet. 



Acer circinatum Pursh. Vine Maple. 



This characteristic west-coast species, with nearly circular 7 -point 

 leaves, occurs sparingly in moist places near Sisson Tavern, but is not 

 common. It is one of the most distinctive plants of the humid Pacific 

 coast division of the Transition zone. 



Ceanothus cordulatus Kellogg. Snow Bush. 



Common in the lower part of the Transition zone on the southern 

 and western baiSal slopes of Shasta. In the upper part of Sacramento 

 Canyon it first occurs at 'The Loop,' whence it is abundant northerly 

 to within a mile or two of P^dgewood. At Sisson and in Squaw Creek 

 and McCloud valleys it is very abundant, but for some reason not 

 apparent it does not reach on Shasta its usual upper limit, and was 

 not observed anywhere above 4,900 feet. Possibly it is choked out by 

 the other chaparral, which is made up mainly of inanzanita {Arcto- 

 staphylos patula) and buck-brush [Ceanothus velutinus). 



Ceanothus cuneatus Nutt. Wedge-leaf Ceanothus. 



This is one of the most characteristic shrubs of the Upper Sonoran 

 zone in California, where it is generally associated with the curious 

 digger pines. The region about Shasta is too high for it. It occurs, 

 however, in the lower valleys, both north and south of Sisson. On the 

 north it reaches from Yreka to a little beyond Edgewood, appearing a 

 mile or two south of the latter point on the road to Sisson, and about 

 4 miles southwest of it on a road farther west. Skipping the broad 

 Transition belt between Edgewood and the Sacramento, it occurs next 

 at Delta, in the Sacramento Canyon, and ranges thence southerly. Its 

 upper border meets the lower border of another species, C. cordulatus, 

 which is common at Sisson, as well as on the southern and western 

 basal slopes of Shasta. 



Ceanothus velutinus Dougl. Buck-brush. 



Profusely abundant on all the manzanita-covered slopes of Shasta, 



from the lower part of the Canadian zone down nearly to the lower 



edge of the Transition. ^Nlixed with Arctostaphylos patula in nearly 



equal proportion it forms the dominant chaparral of the mountain. 



21753— No. 16 20 



