534 
VEGETATION OF BLAKENEY POINT. 
Senecio Jacobaea (v.c.) 
Sherardia arvensis (v.r.) 
Stellaria Boraeana (c.) 
Taraxacum erythrospermum (f.) 
Valeiianella olitoria (c.) 
Veronica arvensis (f.) 
„ officinalis (c.) 
General Characteristics. 
The chief feature exhibited by the dune vegetation here, as 
elsewhere, is the reduction to a minimum of water evaporation 
from the leaf surface by various transpiration checks. Of the 
various forms which these assume, most types are represented 
by the Blakeney flora, and the absence of less protected species 
on the more stable parts, such as Viola ericetorum and Trifolium 
repens , which are frequent constituents of arenicolous floras 
elsewhere, is perhaps associated with the combination here of 
great exposure with the adverse conditions of the soil itself. 
The rolled type of foliage is Represented in the Marram grass, 
Triticum, Festuca arenaria , Corynephorus, and Galium verum, 
whilst the succulent type, with abundant water-storage tissue, 
finds examples in Cakile, Arenaria , Salsola, and Sedum. By 
far the commonest transpiration check, however, is that furnished 
by the rosette type of foliage, which, whilst it admits of the 
maximal amount of assimilation, places the leaves in the plane 
of greatest humidity and their stomatal surfaces against the 
damp substratum. 
The rosulate habit is frequent amongst the ephemerals, being 
found in Cerastium, Erophila, Myosotis, and V alerianella. 
Amongst the biennial and perennial species this habit is 
found, either exclusively or during the vegetative period only, 
in Armeria maritima, Carduus arvensis, C. lanceolatus, 
Convolvulus Soldanella, Erodium cicutarium, Geranium 
molle, Hieracium Pilosella, Hypochceris glabra, H. radicata, 
Plantago Coronopus, Rumex acetosella, Silene maritima, and 
T araxacu m e ry th rospe rmu m . 
The close contact of the leaves with the soil in many of these 
rosettes is perhaps better illustrated by Erodium than any 
