384 Annals of the Carnegie Museum. 



plants themselves but also in the area intervening between them and 

 the shore. 



The Salix discolor-liicida Formation. 



Fades, — 



Salix discolor, Salix lucida. 



Secofidary Species. — 



Salix sericea, Salix nigra, 



Salix cordata, Melilotus officinalis, 



Persicaria laurina, Cardamine pennsylvanica, 



Bidens connata, Argentina anserina, 



Sambucus canadensis, Hilnscus moscheiifos. 



With the development of the outlying Scirpus formation there is 

 usually an accumulation of debris' on the low beach. This debris 

 consists mainly of dead Scirpus leaves and stems, washed up during 

 the winter and spring. It becomes matted together and packed down 

 with sand, so that the shore usually grows outward in little ridges of a 

 foot or fifteen inches in width and three or four inches high. Behind 

 these little ridges miniature lagoons are sometimes formed. In this 

 habitat the Salix discolor-lucida formation is at its best, reaching on 

 the outside to the water's edge and meeting there the Scirpus forma- 

 tion. Occasionally there is a weak intervening development of the 

 Cakile-Xanthium formation, but, as far as found, this formation was here 

 represented only by the Xanthium commune consocies. 



The Salix discolor-lucida formation is particularly well developed 

 along the narrow neck of the peninsula east of the Head. There are 

 also several smaller stations east of the region of the Chimney Ponds. 

 Where by alternation Salix discolor and Salix lucida are absent, the 

 secondary species occupy the habitat. The Salix lucida consocies is 

 comparatively much less important in this habitat, but in the Drift- 

 wood Habitat it is more important than is the Salix discolor consocies. 



The Solidago-Meibomia Formation. 

 Between the Salix cordata thicket and the xerophytic sand-plain to 

 the rear there is usually a zone characterized by various Legumi- 

 nosae and Composite. The usual path of hunters is just back of the 

 fringing zone of willows and the sand there has been enriched by 

 the vegetable debris trodden into it, so that in places there has been 

 formed a rather firm, compact, dark-colored soil, comparatively rich 



