ON THE BOTANY OF SOUTH PEMBROKESHIRE. 959 
loni, Bela maritima, Salsola Kali, Polygonum Raii, Euphorbia Port- 
landica, Juncus acutus, and J. maritimus, 
.. The arm of the haven which extends up to Pembroke has, on its 
southern side, extensive mud flats which are flooded at spring tides, 
and produce some of the plants usually to be found in such places ; 
for instance, Artemisia maritima, Statice Bahusiensis, and Sueda mari- 
ma, * 
. Ponds and bogs are rare, and therefore there is a deficiency of 
aquatic plants ; but there are two marshy districts of considerable size, 
both of which seem to have been subject to the overflow of the tide at 
no very distant period. One of the low tracts extends from Tenby to 
St. Florence, and is about three miles in length, but usually very 
narrow ; the other is called Castle Martin Corse, and is situated near 
to the village of that name; it also does not exceed three miles in 
length, and is narrow. The former of these marshes, never having been 
. Well drained, has always continued in the condition of rough pasture, 
and presents, therefore, a fair specimen of the vegetation occurring 
"upon such spots; the latter was very completely drained about sixty 
years since, and much of it converted into arable land, and although it 
has now fallen back into the state of coarse wet pasture, it is nearly 
deprived of all its peculiar plants, a few only of them remaining in the 
ditches. The following plants were more especially noticed in these 
_Marshes :—Caltha palustris, Ranunculus heterophyllus, R. confusus, 
R. Flammula, R. hederaceus, R. Lingua, R. sceleratus, Drosera rotundi- 
Jolia, Comarum palustre, Myriophyllum spicatum, Helosciadium inunda- 
tum, Galium palustre, Menyanthes trifoliata, Pedicularis palustris, 
Rumex Hydrolapathum, Narthecium ossifragum, Alisma Plantago, A. fa- 
l nunculoides, Sparganium ramosum, S. simplex, and Eleocharis palustris. 
_ In some parts of the district the farming is good, but very frequently 
the farmer has favoured the botanist so far as to allow weeds to spread 
_ to a great extent over his arable land, and the hedgerows seem usually 
to be left to nature. 
p, che geological structure of the tract under notice presents alterna- 
ting bands of the Upper Silurian, Old Red Sandstone, and Mountain 
Limestone formations, Coal is worked in its north-eastern part. ; 
Until recently, we knew nothing concerning the plants inhabiting this 
istrict. In the *Botanist's Guide’ of Messrs. Turner and Dillwyn, 
forty-eight plants are recorded as growing in Pembrokeshire; to these 
s 2 
