258 BOTANICAL GAZETTE [APRIL 
the divide. The same is true to a less extent of the scrub oak; on 
the eastern slope this plant is not abundant north of the Arkansas- 
Platte Divide. 
bove/O00b 
Fic. 2.—Mass elevations of Colorado. 
ELEvATION.—Colorado has an area of 103,480 square miles.’ 
The following table gives the mass elevations of the state in area and 
percentages. 
TABLE I 
MASS ELEVATIONS 
mre Area in sq. | Percentage of 
Elevation railes | total area 
STEREOS Sey ssl aA Ged 
| ; 
6000 feet and below ......... 45,000 | 43 
6000-8000 feet............ 22,000 20 
8000-10,000 feet ........ 24,000 23 
10,000 feet and above........ 12,500 14 
} 
| 
From the above table and the accompanying map showing are 
elevations (fig. 2), it is seen that a great proportion of the state 1s highly 
* GANNETT, HENRY, Report U.S. Geol. and Geog. Survey of the Terris 
(Hayden Survey) 313. 1876. 
