82 REPORT OF NEW JERSEiY STATE MUSEUM. 



This Middle district is eminently an agricultural one and 

 largely given over to truck farms, so that the original flora is 

 exterminated over large 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 americanutn, 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: 



