506 
VEGETATION OF BLAKENEY POINT. 
mixed with drift and the controls with shingle only. All were 
then sown with approximately equal quantities of seed of 
Rumex trigr'anulatus. Unfortunately, of the control cultures 
the seeds germinated in one case only, suggesting that the 
drift may be necessary to prevent the seeds in the first instance 
from being washed too far down into the shingle. Those 
plants which were grown in shingle and drift were both large 
and vigorous, whereas those in the single control were com- 
paratively small. 
Other moderately common species are Festuca rubra , 
Sonchus oleraceus and littoralis, and Senecio vulgaris ; the 
last, as one might surmise from its ephemeral character, is 
fairly common throughout the whole length of the bank ; 
Sonchus littoralis is almost invariably found either on the lee 
side of the bushes of Suceda, or else growing out of the turf- 
like patches of other plants, such as Arenaria, Siletie or 
Festuca. As has been already mentioned, the last-named 
species is usually on the sheltered side of the Suceda bushes 
between their ranks ; it and also Triticum junceum are 
especially characteristic of the most stable portions. 
Plants of the Depressions. 
A few plants are found chiefly in the troughs and shallow 
depressions, towards the landward edge. Of these, the most 
characteristic and abundant is Poa annua, whilst Sedum acre 
is also fairly common and possibly in part owes its situation to 
the frequency with which plants that have passed the flowering 
stage become uprooted and get blown along by the wind, finally 
coming to rest in one of these hollows where the seed is 
probably shed. Air a prceccx also occurs. 
Two other grasses of the depressions are Desmazeria 
loliacea, which is local, anfl the second, Leptur-us filiformis, 
rather rare and much commoner on the lateral hooks. 
These depressions, however temporary, are obviously for the 
time being regions of greater surface stability, and besides 
giving shelter, the shingle is usually finer here than on the bank 
around, and is consequently more retentive of water. As the 
characteristic species above mentioned are all shallow-rooting 
