VEGETATION OF BLAKENEY POINT. 57 



colour, the calyx is a pale yellowish-green. The writer has 

 observed the same differences in flowers of Silene inflata and 

 Lychnis vespertina, and in all cases the irregularity of distribu- 

 tion seems to preclude the possibility of soil influence. 



Another member of the Caryophyllacece which exhibits 

 interesting variation is Arenaria peploides. As is well known, 

 one of the chief distinctions which separates this genus from 

 that of Stellaria is the entire character of the petals in the 

 former, and their bifurcation in the latter. At Blakeney, 

 however, the petals of the Arenaria peploides frequently shew 

 a deep notching a feature that may extend to all or part of 

 the flowers on a plant, and is not always constant for the 

 individual petals of the same flower. This variation would 

 appear to be influenced by seasonal factors, since it is most 

 marked in the early part of the flowering period, and so far as 

 observations go is not found in the later phase. 



The prevalence of Senecio Jacobcea upon the dunes has 

 already been a matter of comment, and amongst the numerous 

 individuals there seems to be a marked variation in the form of 

 the radical leaves. In some of these the terminal portion is 

 almost undivided, and only a few lateral lobes are present lower 

 down, whilst in those borne by other plants the leaf as a whole 

 is cut up in a pinnate manner and each lobe is itself pinnatifid, 

 resulting in the normal parsley-like appearance of the margin. 

 Intermediates between these two conditions can often be found, 

 which, however, does not of course preclude the possibility of 

 the two forms being distinct varieties. 



In the genus Salicornia, two species call for special mention, 

 of which one is S. disarticulata, easily distinguished by the 

 solitary character of the flowers, in place of the groups of three 

 or more found in the other species. The second form which 

 has just been described, S. dolicostachya (C. E. Moss, New 

 Phytologist, Dec., 1912), occurs in two places at Blakeney, 

 viz., on the Samphire Marsh near the Hood, and was found 

 by the writer some three years ago on a denuded marsh at the 

 south side of the estuary. This form is much branched with 

 long spikes and, unlike other annual species, has the lateral 

 flowers of the group separated by the median. 



