OCT, 1899. ] PLANTS. 153 
Acer macrophyllum Pursh. Oregon Maple; Big-leat) Maple. 
The tree maple is rare in 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 Torr. 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 up to an altitude a little above 5,600 feet, and along Squaw Creek 
to nearly 6,000 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 basal 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 Edgewood. <At Sisson and in Syuaw 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 manzanita (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 Doug]. 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. Mixed with Arctostaphylos patula in nearly 
equal proportion it forms the dominant chaparral of the mountain. 
21753—No. 16 20 
