240 de Fr aine. — The Morphology and Anatomy of the 
for this part of the paper. It is a great pleasure to acknowledge also 
the help given me by him in the identifications, in supplying plants raised 
from seed, and for his assistance in the preparation of the paper. 1 
I. Habitats of the Plants examined and Consideration 
of the Factors involved. 
Since the topography of Blakeney Point has been fully illustrated and 
described, it will not be further considered here. 2 
Statice binervosa. 
This species usually occupies a very definite habitat. It is most 
commonly found forming a zone upon the flanks of the lateral shingle 
banks (Oliver and Salisbury, loc. cit., p. 30 of reprint). In this situation it 
is the most characteristic species, and occurs in company with Frankenia 
laevis , Armeria maritima ) Plantago Coronopus , and Glyceria maritima . 
These lateral shingle banks occur more or less at right angles to the shore, 
they are sheltered from wave impact, and are in a state of dormancy ; their 
shingle is stabilized. The soil of this zone is typically bare shingle in which 
the interspaces are completely filled with sandy mud. The habitat of 
vS\ binervosa is therefore only reached by the very highest tides, so that this 
species is the least maritime of any of the Statices found upon the area. It 
is in harmony with this fact that Statice binervosa will flourish and flower for 
years in normal garden soil. The rare occurrence of this species on the 
Main bank, in which habitat the mobile pebbles of the beach are gradually 
encroaching on the marsh, indicates that conditions of stability are a neces- 
sity for its existence. Oliver and Salisbury record, in this connexion, that 
S. binervosa only occurs on the Main bank sparsely near the crest, where 
the bank is broad and therefore less mobile, or else where dunes on the sea- 
ward face make stability more comparable with that on the laterals ; further^ 
on the ‘ Yankee bank ’ of the Long Hills the binervosa zone is discontinuous, 
and the breaks correspond with the places where the shingle is unprotected 
and therefore unstable. In obvious relation to this first requisite of the 
plant for a fairly stable habitat there is a remarkable difference between 
its underground parts and those of such typical mobile shingle Main bank 
plants as Suaeda fructicosa , Silene maritima , and Arenaria peploides. In 
these latter, rejuvenation by vigorous budding from the prostrated shoots 
or from the rhizome occurs abundantly, and there is ample evidence to 
prove that the more the shingling the greater the response of the plant to 
1 Text-figs. 2, 3, 4 and 13, and Photographs 1 and 2 were kindly given by Dr. Salisbury. 
2 Oliver, F. W., and Salisbury, E. J. : Topography and Vegetation of Blakeney Point, 
Norfolk. Trans. Norf. and Norw. Nat. Soc., vol. ix, 1913, p. 485 ; also reprinted with separate 
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