82 REPORT ()]• X1':\V U^KSl'V STATl-. MTSKUM. 



This Middle district is eminently an a.e^ricultnnil one and 

 largely y^iven over to truck farms, so that the original flora is 

 exterminated over larj^e areas. Bogs and swamps have been 

 drained to a great extent and much forest land has disappeared. 

 There are still, however, along- the banks of creeks and streams 

 and in other situations sufficient remnants to form a pretty 

 accurate idea of the constituents of the flora. 



Fig. 4. — Range of Erythronium americanum, a species which enters the 

 upper edge of the Middle District. 



The region comprises all of the cretaceous formation, and part 

 of the tertiary, as already explained, but peculiarities in distribu- 

 tion conform not to the boundaries of these areas, but rather to 

 the areas of marl, sand or other varieties of surface soil. 



Several elements or intrusions may be detected in this flora of 

 the Middle district : 



