42 University of California Publications in Zoology. [Vous 
Acer macrophyllum Pursh. 
I saw this maple only in the middle portion of Mountain 
Home ereek canon, where it is not uncommon. 
Acer glabrum Torrey. 
I saw the Sierra maple as a small tree only on the steep north 
side of San Bernardino peak in deep dark ravines at about 7000 
feet altitude. Identified by Miss Eastwood. 
Ceanothus cordulatus Kellogg. 
In low dense thickets, mere mats at the higher parts of its 
range, this buekthorn or buck-brush, was a conspicuous feature 
of the upper Transition zone, 6500 to 9000 feet, according to 
slope. Its distribution coincided quite precisely with that of 
Arctostaphylos patula, though it occurred perhaps a trifle lower. 
Its white inflorescence came into prominence the latter half of 
June at higher altitudes, earlier lower down. (See pl. 118.) 
Ceanothus divaricatus Nuttall. 
This blue-flowered mountain lilae was abundant in the Upper 
Sonoran brush belt, on south-facing slopes as high as 5700 feet 
altitude on the north side of the upper Santa Ana. All over 
the Pacifie foothills this plant was in conspicuous bloom the mid- 
dle of June. The sticky clusters of berries became an un- 
pleasant feature of a tramp through the brush belt in August. 
Ceanothus integerrimus Hooker & Arnott. 
This white-flowered deer-brush was an abundant member of 
the Upper Sonoran brush belt flora, especially on shaded or moist 
slopes. Very conspicuous on the north side of the divide at the 
head of Mountain Home creek, among the big-cone spruces, where 
it was in conspicuous blossom the middle to the last of June, 
1907. I saw this hlae as high as 6600 feet on a sun-facing steep 
slope on the south fork of the Santa Ana. 
Ceanothus perplexans Trelease. 
Common in a tongue of the Upper Sonoran brush belt along 
the south wall of the upper Santa Ana, is high as 6300 feet alti- 
tude. 
