PI^ANTS OF SOUTHERN NEW JERSEY. 83 



(i) Plants that have spread over from the country north of 

 the fall line, most noticeable in the northwestern part of Burling- 

 ton County and northern Monmouth County (Fig. 4). 



(2) The isolated Pine Barren colonies or islands already re- 

 ferred to. 



(3) Species which seem to have their center of abundance in 

 the Cape May district or more properly in Delaware (Fig. 5). 



Pig- 5- — Range of Lobelia puherula, a Cape May plant which pushes along 

 the coast and Lower Middle District. 



In the bogs at Delanco and Repaupo, close to the Delaware, and 

 to a less extent in some of the others occur certain decidedly 

 boreal species, which probably owe their presence here to some 

 earlier phenomenon than the recent influx of upland species 

 across the fall line. These occurrences are parallel with the 

 presence of Rhododendron and Ilicioides in the swamps of the 

 Pine Barrens. 



