| 8] VEGETATION REGIONS OF THE PRAIRIE PROVINCE 383 
American lake country, (4) Columbian littoral forest region, 
(;) forest and alpine region of the northern Rocky mountains, 
(6) northern forest-prairie region, (7) Missouri prairie region, 
(8) steppe and salt-waste region of the Rocky mountains, (9) 
Californian lowland, subalpine and alpine region, (10) decid- 
uous forest region of the Mississippi basin, (11) evergreen region 
af the South Atlantic states, (12) steppe and desert region of 
Ationa, (13) chaparral region of Texas and northern Mexico, 
(4) North Mexican subalpine and alpine region. Many of 
these regions are well defined, while others manifest too great 
reliance upon inaccurate data. This is especially evident in the 
ase of the Missouri prairie region, which is erroneous both as 
to boundary and as to characterization. Drude makes the 
fastern boundary of this region follow the west bank of the 
Mississippi to the confluence of the Ohio, where it bends to the 
fast to include the greater portion of Illinois, then turns west- 
| «Ward along the southern border of Wisconsin to the Minnesota 
talley, whence, passing into the northern forest-prairie region, 
ittuns northwest to Beaver river in Saskatchewan, and then 
| Southwest to the head waters of the Saskatchewan in the foot- 
: hills of the Rocky mountains. Taking the western border of 
| the 20 per cent. wooded area as the line of demarcation 
| _ between the forests of the Alleghany province and the prairie 
 Movince, the eastern third of Texas, most of the Indian territory, 
_ "arly the whole of Missouri, and the southern portion of Iowa, 
long to the forested province. Even if a much higher pet 
7 “tt. of woodland be thought necessary to characterize an area 
- Storested, the dense woods of Louisiana, Arkansas and Missouri 
ig indubitable evidence that these states are an integral part of 
’ it Alleghany province. To the north of the prairies of se 
a apd Drude distinguishes the prairies and ee sara 
1 i Mtchewan, Alberta, and Athabasca as the : 
> _ Prairie region. As will be demonstrated later, these ar 
Ely identical with Missouri prairies, and are in no — 
y distinguished from them. Along the Rocky move 
Drude refers a broad strip of plain and foothill, comprising 4 
