1902.] NATURAL SCIENCES OF PHILADELPHIA. 659" 



is characterized by the presence of holly, Ilex opaca Ait., the 

 height of the dune being determined by the height of the protect- 

 ing trees, i.e., twenty -five feet. The island is about two miles 

 long, and is set m the middle of the marsh about half a mile 

 inland from the high dunes. It is covered mainly by pine and 

 oak trees which are quite large on its highest parts. Inside of this 

 marsh island there is a comparatively dry marsh, in which all 

 plants except grasses, I'ushes and sedges do betler than in the 

 larger marsh outside. At the ends of this island in the marsh, 

 and on the landward side, are low-lying sandy plains, low enough to 

 be saturated at high tide with salt water and which support 

 a characteristic growth of Buda and similar succulent species. 

 In the list, which is rather cumbersome, the numbers refer to 

 the areas marked on the map represented in fig. 6, and the 

 lower-case letters of the alphabet refer to the zoues into which 

 the several areas are divided. The plants, therefore, in the list 

 occur iu the areas and zones designated. A dagger (f) signifies 

 that the plant is represented in the herbarium of Dr. Githens. 

 The plants in the list are named according to the sixth edition of 

 Gray's Manual, but for convenience of reference the writer, who 

 has edited the notes of Dr. Githens, has added the names found in 

 Britton's Manual of the North United States and Canada. The 

 orders follow the sequence of Eugler and Prantl's Pie Natiir lichen 

 Pflanzenfamilien. The plants not given in the list published ^in 

 "An Ecological Study of the New Jersey Strand Flora"' are 

 designated by an asterisk. 



The commingling of the plants of different zones may be repre- 

 sented as follows : 



II to la and lb. 



III to II aYid lb. 



V to IV. 



Ille to IV and V. 



VI to Ve. 

 \ld to V. 



List of Species and Zones Occupied by Them. 



Vic. Pinus rigida Mill. 



Illo. Juniperns virginiana L. 



^Proc. Acad. Nat. Set. FMla., 1900, pp. 661-671. 



