XI 



strip along the Atlantic coast. The geological strata, as pointed out 

 by Dr. Britton,* upon which this flora grows are : Tertiary, lying to 

 the south and southeast of a line drawn from a point on the Atlantic 

 coast a few miles south of Long Branch, to another near the head of 

 Delaware Bay ; and Cretaceous, north of this line and extending be- 

 tween it and the southern edge of the Triassic formation, which follows 

 a line from the center of Staten Island to the vicinity of Trenton. 



*' The Tertiary pine barrens extend southward along the Atlantic 

 coast to Florida ; it is with the flora of the northern extension of these 

 sandy stretches of Cretaceous age which we have to do at present.'* 



Dr. Britton show^s that this flora, the northern pine barren flora, is 

 characteristic, that it is found upon the yellow gravel drift and that it 

 is a flora which is peculiarly American in its character. He also shows 

 that a certain number of its plants are found in the southern portions 

 of Staten Island, that it extends to Long Island and, the discussion 

 of the geological features would tend to show, extends to the north, in 

 Martha's Vineyard and Nantucket, which has been proven to be the 

 case by Dr. Hollick and others. 



The most important of these pine barren plants are here given. 



List of Species. 



Andropogon glomeratiis. 

 *' maciourus. 



' * hypericoides. 



Ascyrum Crux Andreae. 



** stans. 

 Aster spectabilis. 

 * * nemoralis. 

 '^ concolor. 

 Pienis Mariana. 

 Asclepias obtusifolia. 



" Caroliniana. 

 Arenaria squarrosa. 



Crataegus uniflora. 

 Chrysopsis Mariana. 

 ** falcata. 



Coreopsis rosea. 

 Cyperus cylindiicus 

 Cliamaecyparis thyoides. 



Dro&era filiformis. 

 Meibomia laevigata. 

 *^ . viridifiora. 



Eupatorium rotundifolium. 



'* album. 



" liyssopifolium, 



'* leucolepis. 



Euphorbia Ipecacuanhae. 

 Eleocliaris melanocarpa. 



Gnaphalium purpuieum. 

 Gaylussacia dumosa. 

 Glyceria obtusa. 



Hudsonia ericoides. 

 Helonias bullata. 

 Helianthus angustifolius. 



Ipomoea pandurata. 



Juncus pelocarpus. 



" scirpoides var. macrostemon 



Kalraia angustifolia. 



Magnolia glauca. 



* On the Northward Extension of the New Jersey Pine Ban-en Flora on Long and 

 Staten Island: Bull. Torr. Bot. Club, 7, 1880, p. Si. 



