NUMBER 6 
BOTANICAL (GAZETTE 
¥UNE 1898 
THE VEGETATION REGIONS OF THE PRAIRIE 
PROVINCE. 
Roscor Pounp and FREDERIC E, CLEMENTS. 
(WITH PLATE XX1) 
THE vegetative covering of the North American continent 
‘als naturally into two great areas, forest and plain. At first 
ought it would seem that these were primary phytogeo- 
"arctic region of Engler. Three great belt 
Ward from this northern mass, each undergoing profound 
8esin type, and becoming differentiated into well-character- 
~ fegions. The floristic separation of these regions -_ ges 
ay forest-region is so great that the relationship 1s rahe ha 
ey less close than that existing between the floral cones 
_-vtish America and that of northern Eurasia, and seed ee 
, Ses it practically disappears. The forests of Mexico and 
l America are tropical, or subtropical, and are both 
381 
