128 SILVA OF NORTH AMERICA. ERICACEA, 
The Arizona Madrofia was first noticed in southern Arizona in June, 1851, by Dr. George Thur- 
ber,’ while he was attached as botanist to the United States and Mexican Boundary Survey, and for 
many years was confounded with the species of the Pacific coast region. In its habit, which is that of 
a small White Oak, and in the color of its bark, it is one of the most distinct species of the genus. 
The contrast in color between the white bark of the trunk and the bright red branches and pale green 
leaves 1aakes this tree a remarkable and beautiful object at all seasons of the year; and in the spring 
when the pure white flowers are expanded, and late in the autumn when its branches are covered with 
clusters of brilliant fruit, it is particularly beautiful. 
1 See iii. 36. 
EXPLANATION OF THE PLATE. 
PuateE CCXXXIII. Arsutus ARIZONICA. 
. A flowering branch, natural size. 
be 
Vertical section of a flower, enlarged. 
. A flower, the corolla removed, enlarged. 
. A stamen, enlarged. 
. A fruiting branch, natural size. 
. Vertical section of a fruit, enlarged. 
A seed, enlarged. 
. Vertical section of a seed, enlarged. 
CWONAA AP wWHD 
. An embryo, much magnified. 
