A HISTORY OF BERKSHIRE 



maritime species are not likely to occur, and in future the maritime 

 species will not be considered in this summary. 



Of the 103 species which are recorded for 50 to 60 counties Berk- 

 shire has 8 1, n of the missing species being maritime. The 9 inland 

 species not recorded for the county on recent or trustworthy authority 

 are the cranberry (Oxy coccus quadripetala, the Vaccinium Oxy coccus of 

 Linnasus), which may possibly occur in the bogs of the southern part of 

 the county. The throat- wort (Campanula latifolia), a very local plant in 

 southern Britain, occurs in Bucks, but from its being so conspicuous is 

 scarcely likely to have eluded observation ; and the sweet cicely (Myrrhis 

 Odoratd) is chiefly found in northern Britain, and there as a somewhat 

 questionable native ; and the pond-weed (Potamogeton gramlneum (P. 

 heterophyllus] may yet possibly be found in some of the large sheets of 

 ornamental water. The other absentees, Viola lutea, Tbalictrum minus, 

 Trollius, Geranium sanguineum, Prunus Padus and Vaccinium Vitis-idaea, 

 are perhaps with occasional exceptions, as the bird cherry, northern 

 plants or natives of mountainous districts, or, as in the case of the 

 bloody cranesbill (Geranium sanguineum), of rocky limestone places or 

 sand dunes. 



Of the 1 06 species stated to occur in from 40 to 50 counties, 

 Berkshire has 79. Of the missing ones, 13 are maritime species ; one of 

 them however, the grass Sclerochloa (Panicularia) distant, being occa- 

 sionally found inland. The other absentees are chiefly plants of northern 

 Britain or are mountainous species, such as the stone bramble (Rubus saxa- 

 tilis]. The Alpine club-moss (Lycopodium alpinum) is found in Hampshire 

 and Gloucestershire, and being in southern England a very local species 

 may with Habenaria albida, which occurs but rarely on the southern 

 chalk downs, possibly be found, and there is even greater probability of 

 adding the round leaved mint (Mentha rotundifolia], the great sundew 

 (Drosera anglicd] and the sedge (Carex diandra = C. teretiuscula) to our 

 list. 



Of the 89 species recorded from 30 to 40 counties Berkshire has 

 57. Of the 35 missing ones 15 are maritime, and 9 are nothern species 

 which do not reach so far south as Berkshire, while the green spleenwort 

 (Asplenium viride) is a fern inhabiting damp rocky places. The practical 

 absence of the burnet rose (Rosa pimpinellifolid) accounts for the non- 

 occurrence of Rosa Sabini and other members of the irrvoluta group, since 

 these are now to be considered to be hybrids of R. pimpinellifolia with 

 jR. canina or members of that group. There is some remote possibility 

 of one or other of the following being found : Linum angustifolium, Pyrola 

 media, Pulmonaria, Ma/axis paludosa, the two latter being found in the 

 New Forest ; and Ma/axis should be well searched for in the sphagnum 

 bogs of the Loddon district, Carex filiformis also occurring in the Hamp- 

 shire bogs, and the reed grass (Arundo Calamagrostis = Galamagrostis 

 lanceolata), a local grass, in damp woods. 



Of the 103 species recorded from 20 to 30 counties Berkshire has 

 only 51, but of the 52 missing ones 14 are maritime, and 21 are 



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