COMMON PLANTS. 307 
that have been published from time to time; also the lists of 
Hampshire, Sussex, and Surrey plants; and enter im our list of 
common plants every species common to the Southern counties 
and to the Northern. We have only the Northern Flora (in- 
complete), and the Floras of Aberdeen, by Dickie and Macgil- 
livray. We enter every plant common to the Southern and 
Northern Counties of Great Britain. We take it for granted that 
the Aberdeen plants extend further north, though we have no 
reliable authority further north than Elginshire. We exclude all 
maritime plants, because these are inadmissible on our principles; 
we consider them as local plants, however extensive their range 
may be; they do not answer to the conditions on which the 
present list is constructed. Second, we strike out every plant 
for which there is not some authority in the various works on 
the botanical productions of the interior of the Island, such as 
Purton’s Midland Flora, the Floras of Herts, Oxford, Bedford, 
Cambridge, Shropshire, Yorkshire, Berwickshire, the catalogue 
of the Edinburgh Botanical Society, Hopkirk’s Flora Glottiana, 
Gardiner’s Flora of Forfarshire, ete. etc. We deem a plant 
common if it be found in all these Floras, lists, catalogues, etc., 
unless it be stated that the species is rare, scarce, or the like. It 
has been thought expedient not to discard from the list of com- 
mon plants such species as Convolvulus sepium, which does not 
reach the northern confines of Britam. In such cases we con- 
sider the species common if it be common in Yorkshire. The 
Flora of this county is in some measure neutral, having two as- 
pects, one towards the south and the other towards the north. 
With this latter Flora (Yorkshire) we compare the peculiarities 
of the more northern species. The number of plants common to 
the southern counties and Aberdeen is about 550. The number 
common to the counties bordering on the English Channel and 
Yorkshire is about 800. 
The total number of species which grow spontaneously in the 
south of England, from the South Foreland on the east, to the 
Lizard Point on the west, on about three hundred miles of coast, 
without reckoning the bays and estuaries, and extending thirty 
miles inland towards the north, may be estimated at, or assumed 
to be inround numbers about 1000. The number of species which 
grow on the southern shore of the Pentland Frith, or from Dun- 
cansby Head in Caithness to Cape Wrath in Sutherland, about 
