74 SILVA OF NORTH AMERICA. SALICACEA, 
Populus Mexicana inhabits the banks of mountain streams in southern Arizona and southwestern 
New Mexico, and is widely distributed through northern Mexico. 
Populus Mexicana appears to have been first collected by Berlandier in northern Mexico. 
western New Mexico. In eastern New Mexico it appears to be eastern New Mexico, and western Texas, and which Professor Tre- 
replaced by Populus Wislizeni and by the Rocky Mountain form of lease has called var. intermedia in his unpublished notes on the 
Populus deltoidea, which in the ninth volume of this work was genus Populus. 
confounded with Populus Fremontii so far as relates to Colorado, 
EXPLANATION OF THE PLATE. 
Puare DCCXXXIII. Porvnus Mexicana. 
A flowering branch of a staminate tree, natural size. 
A staminate flower, enlarged. 
A flowering branch of a pistillate tree, natural size. 
A pistillate flower, enlarged. 
A fruiting branch, natural size. 
A fruit, enlarged. 
Se ee 
Leaf of a shoot, natural size. 
