114 



upon the dune crests at Seven-mile Island which serve to check 

 erosion from falling rain while no vines are found on the sands at 

 Seaside. Similarly at Beach, mats are formed on the sands by 

 grapevines and more extensively by creeping juniper 



In the forest on the dunes at Seaside the absence of oaks 

 is to be noted. The dominance of lodge-pole pines which become 

 dwarfed, greatly compacted and tangled from the impact of the 

 ocean winds, is remarkable. 



Further contrasts of the plant life of the three areas are 

 brought out in the tabulated lists. 



THREE DUNE ASSOCIATIONS COMPARED 



New Jersey 

 Seven-mile Island 



Illinois 

 Beach (R.R.) Station 



Oregon 

 Seaside-Gearhart 



High beach sands and fore dunes 



Cakile edulenta 

 Strophostyles helvola 

 A mmophila arenaria 



A renaria peploides 



Cakile edulenta 

 Lathyrus maritimus 

 Ammophila arenaria 

 Calamovilfa longifolia 



Cakile edulenta var. 

 Lathyrus maritimus 

 Ammophila arenaria 



A renaria peploides 

 Carex macrocephala 

 Glehnia littoralis 



Ammophila 



Vitis lubrusca 

 Vitis aestivalis 

 Tecoma radicans 



Primus serotina 



Dune crests 

 Ammophila 



Vitis aestivalis 



A mmophila 

 Franseria chamissonis 

 A bronia latifolia 

 Lupinus littoralis 

 Tanacetum camphoratum 



A rctostaphylos uva-ursa A rctostaphylos uva-ursa 

 Primus pumila 



Quercusfalcata 

 Quercus minor 

 Ilex opaca 

 Myrica carolinensis 



Juniper us Virginia 



Smilax rotundifolia 



Forest in lee of dunes 



Quercus rubra 

 Quercus velutina 



Populus balsamifera 



Juniperus procumbens Pinus contorta 



Juniperus communis 



Gaultheria shallon 



