182 BROOKLYN BOTANIC GARDEN MEMOIRS 



found on Nantucket and elsewhere. The second type is the diffuse 

 one, where the stems are scattered widely. 



In New Jersey, Corema Conradii (Fig. 6) is associated with rounded, 

 basket-like, dwarf pitch pines {Pinus rigida) along with bearberry 

 {Arctostaphylos uva-ursi), huckleberry {Gaylussacia resinosa), sweet 

 fern (Comptonia asplenifolia) , trailing arbutus {Epigaea repens) and 

 the like, so that this type of heath I have called a Corema). Some 

 facts may be learned about the vegetation of the New Jersey Coremal 

 by contrasting it with the Coremal on the Island of Nantucket. The 

 physiognomy is slightly different, owing to the absence of the dwarf 



Fig. 5. Cushion of broom-crowberry {Corema Conradii), central part of Nan- 

 tucket. September 5, 1914. 



pines in the true Coremal of Nantucket. In both districts, there is a 

 low vegetation of shrubby oaks, Quercus nana and Q. prinoides. The 

 bearberry (Arctostaphylos uva-ursi) is more abundant on Nantucket 

 (Figs. 3 and 4) than on the plains of New Jersey, while the broom- 

 crowberry is found in both districts (Figs. 5 and 6). A comparison of 

 the Nantucket vegetation gives a clue to the origin of the plains 

 (Coremal) and the pine-barren vegetation of New Jersey. Heath- 

 land is the result of the factors which are summed up under the general 

 term oceanic climate, and Nantucket, isolated far out at sea, has an 

 oceanic climate. The strong winds that blow and the pervious 



