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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 34