PIjANTS OF SOUTHERN NEW JERSEY. 45 



■Certain coastal plain. species occur a short distance above the 

 fall line along river valleys, and while this is not particularly- 

 noticeable on the smaller streams flowing into the Delaware from 

 eastern Pennsylvania, it is obvious along the Delaware River 

 itself for some distance north of Trenton, where Dr. Britton has 

 recorded a number of coastal plain species in his Catalogue cf 

 New Jersey Plants. 



In the valley of the lower Susquehanna also a number of 

 species occur within the limits of Pennsylvania, which do not 

 range so far northward elsewhere except in the New Jersey 

 coastal plain. Their distribution is, of course, more or less con- 

 tinuous down the shores of Chesapeake Bay to the coastal plain 

 in Maryland ; while they are absent in the intervening Piedmont 

 region of southern Pennsylvania. 



Such species are: 



Pinus echinata. Ptelea trifoliata. 



Cyperus lancastriensis. Chionanthus virginianus. 



Blephariglottis peramcena. Asimina triloba. 



Castanea pumila. Dianthera americana. 



Cercis canadensis. Lippia lanceolata. 



Meibomia sessilifolia. Ipomoea lacunosa. 



Phaseolus helvolus. Ruellia ciliosa. 



Opuntia opuntia. Galium concinnum. 



Ilex opaca. Boltonia asteroides. 



Rhus vernix. Willugbseya scandens. 



Euonymus atropurpureus. Tecoma radicans.* 

 Acer negundo. 



Some of these, notably Cercis, occur on the upper Delaware 

 and Raritan, quite isolated from the general range of the species 

 to the southward, but they are everywhere plants of the hilly 

 country near the fall line and not coastal plain species. 



The isolated colonies of coastal plain plants in the Piedmont 

 region, already referred to, are probably not as numerous as 

 formerly, owing to the general tendency to. drain the bogs and 



* Other species occur in the lower Susquehanna Valley which are not 

 known from New Jersey and are hence omitted from this list. Many of those 

 listed are much more common in the Susquehanna Valley than in that of the 

 Delaware, as one would expect in passing nearer to the upper limits of the 

 coastal plain, and on the Raritan or lower Hudson all but one or two have 

 disappeared. A few species in the list extend casually to southern New 

 England along the coast, and a few occur in isolated colonies in other parts 

 of southeastern Pennsylvania. 



