A FOREST CENSUS IN LYON COUNTY 



397 



A FOREST CENSUS IN LYON COUNTY, IOWA. 



DAVID H. BOOT. 



The northwest corner of Iowa has comparatively few native 

 trees because of the xerophytic conditions which prevail there. 

 The rainfall of this part of the state is the least in Iowa, at 

 times going as low as eighteen inches for the year, and in ex- 

 posed regions, the forest trees have been unable to obtain a 



xs: n 



xiz nx 



I 



mi 



r 2 3m vm 



Fig. 46. 



footing. The native trees are nearly all found along the streams 

 or in protected valleys. A good illustration of this is in Cen- 

 tennial township in the southwestern corner of Lyon county, 



