THE VEGETATION OF SHACKLEFOKD BANK 11 



tcras than for Beaufort (Hatteras 60.85 inches, Beaufort 52.55 inches).'' 

 These figures differ somewhat from those quoted by Kearney for Hat- 

 teras. 



The precipitation is fairly uniform throughout the year. No pro- 

 longed period of drought is liahle to occur. 



The prevailing wind during the growing season is from the southwest. 

 This is the wind which most affects the woody vegetation, so that the 

 trees in exposed positions incline strongly to the northeast, the windward 

 (southwest) side being denuded of branches, while the foliage lies mainly 

 to leeward of the axis. Just the opposite is reported for the trees on 

 Ocracoke.2 



NOMENCLATURE 



The nomenclature adopted is that of Gray's Manual of Botany, 7th 

 edition, revised by Robinson and Fernald, and in the case of plants not 

 listed in this work, of Small's Southern Flora. 



Exact determination of the plants found is of the highest importance 

 in such an account as this. This has been made possible by the kind- 

 ness of Dr. John K. Small, of the New York Botanical Garden, to whom 

 specimens of practically all the plants listed were sent. I wish to express 

 here my thanks to Dr. Small for his assistance. 



PLANT FORMATIONS 



The plants occurring on Shackleford Bank may be arranged in the 

 following groups : 



I. Sand strand vegetation. 



1. Treeless (open) : 



a. Inner beach formation: Croton-Cenchrus association. 

 6. Outer beacli formation: Salsola-Euphorbia association, 

 c. Dune formation: Uniola paniculata association. 



2. Trees and shrubs (closed): 



0. Thicket formation: Ilex vomitoria association. 



h. Thicket woodland formation: Persea-CalUcarixi association. 



c. Woodland formation: Quercus vU-giniana 'association. 



II. Marsh vegetation. 



1. Salt. marsh formation (closed): Spartina-Salicornia association. 



2. Creek marsh formation (closed): Juncus-Eleocharis association. 



3. Dune marsh formation: 



o. Cladium-Kosteletzkija association. 

 1). Proserpinaca-Aspidiwrn association. 



iFrom Anmial Summary, N. C. Section of Climatologieal Service of the U. S. Weather Bureau, 

 1908, p. 105. 



sKeamey, 1. c, pp. 266, 271. I am informed by Mr. W. B. Longest of Beaufort, who has visited 

 Ocracoke daily for some years, that Kearney is in error as to this matter. Mr. Longest states that 

 at Ocracoke, as elsewhere on our coast, the trees are most aflfected by the shimmer winds (off the sea), 

 and that the axes of the trees incline toward the North. 



