PLANTS OF SOUTHERN NEW JERSEY. 109 



Dr. N. L. Britton* many years ago called attention to the 

 resemblance of the plants of the Kittatinny and Shawangunk 

 mountains of northern New Jersey to those of the Pine Barrens, 

 and listed the following species common to both : 



Pinus rigida. Lechea racemulosa. 



Juncus militaris. Polygala polygama. 



Orontium aquaticum. Epigsea repens. 



Quercus ilicifolia. Gaultheria procumbens. 



Corema conradii. Azalea viscosa. 



Prunus pumila. Gaylussacia frondosa. 



Lespedeza hirta. Gerardia quercifolia. 



Cracca virginica. Solidago puberula. 



Lupinus perennis. Solidago bicolor. 



All these isolated patches of an earlier type of vegetation in a 

 region floristically older seem to me best explained by the assump- 

 tion already made that they are relics of an earlier flora now 

 nearly exterminated over the Piedmont region, but of which the 

 present New Jersey coastal plain flora is a derivative. I claim no 

 originality for this theory, as Dr. John W. Harshberger has 

 explained it in detail,t basing his deductions mainly upon the 

 consideration of the plants of the Kittatinny and Pocono Moun- 

 tains, and Dr. Roland M. Harper has referred to it§ in con- 

 nection with a study of bog and swamp plants. I merely wish to 

 state that my investigations lead me to the same general conclu- 

 sions, although, as already stated, certain other influences and 

 elements are probably involved in the problem. 



Dr. Harper brings up another interesting question in his paper, 

 namely, the resemblance of the coastal plain flora to that of the 

 glaciated areas on the other side of the Piedmont region. This 

 resemblance has long been familiar to me, as during my studies 

 of the coastal plain plants I have spent some time, nearly every 

 year, in the mountains of Sullivan and Wyoming counties, Penn- 

 sylvania, and have found there the following species, which also 

 occur in the New Jersey coastal plain : 



* Bull. Torrey Bot. Club XI, p. 126, and XIV, p. 187. 

 t Proc. Acad. Nat. Sci., Phila., 1904, p. 606-609. 

 § Rhodora VII, p. 69 (or VIII, p. 27). 



