SUMMAKY 629 



Bianthus deltoides, Ih-osera anglica, Mentha rotunclifolia, and Carex (diandra) 

 tereiiuscida, may possibly be discovered. 



Of the eighty-nine species recorded from thirty to forty counties, 

 Berkshire has fifty-seven ; of the thirty-two missing ones, fifteen aie 

 maritime and nine are northern plants which do not reach so far 

 south as Berkshire. Asplenium viride is a plant of rocky situations ; the 

 absence, or almost entire absence, of Eosa pimpinelli folia accounts for 

 the absence of E. Sabini and other members of the E. involiita group, 

 since these are now considered to be hybrids of E. pimpinellifoUa and 

 E. canina. Some at least of the following local species may possibly be 

 found : — Linuni angiistifoUiwi, Pyrola media, Pidmonaria, Carex filiformis, 

 Malaxis paludosa, and Arundo Cakimagrostis {Calamagrosiis lanceolata). 



Of the 103 si)ecies recorded from twenty to thirty counties, Berk- 

 shire has only fifty-one, but of the fifty-two missing ones, fourteen are 

 maritime and twenty-one are northern species. Of the remaining 

 plants, Scirpus Savii (cernuus) and Eubia are rarely found far inland, 

 while ImpaUens Noli-fangere is not native so far south, a.nd Arenaria verna 

 is a northern sj)ecies with a solitary outlying station at Kynance Cove 

 in Cornwall, and there as a variety, not as the typical plant. Cicuta 

 rirosa, although having an extensive range in Britain, is very local, 

 and Sparganiuni minimum is also rare in southern England. The re- 

 maining species not hitherto recorded as native species of Berkshire, 

 but two or three of which certainly may be discovered, are Salix 

 acuminata (now considered to be a hybrid), Campamda joatula (recorded 

 as a casual plant\ Eupliorhia p'atijphyUa, Lastrea aemnla (Dryopteris aemula), 

 Andromeda, Pinguicida lusilanica, HymenophyUum tunbridgense, Cardamine 

 impatie7is, Symphytum tuberosum, Gastridium, and Vicia Orobus. 



We now come to the more local British species, and in order to 

 save space we shall enumerate, not the absentees, but the plants 

 which occur in Berkshire, and are also found in twenty, or fewer 

 than twenty, British counties and vice-counties. 



Of the eleven plants found in twenty counties only, Berkshire has 

 Geranium rotundiJoUum, Oenanthe silaifolia, Linaria repens, Stachys ambigua, 

 and Fritillaria Meieagris. 



Of the eleven plants found in nineteen counties only, Berkshire has 

 Fumaria Boraei, Cineraria {Senecio) campesiris, and Galium sylvestre. 



Of the ten plants found in eighteen counties only, Berkshire has 

 Polygala vulgaris and Orchis incarnata (these two plants are now known 

 to belong to a larger number of counties than was formerly sup- 

 posed). 



Of the sixteen plants found in seventeen counties only, Berkshire 

 has Fumaria confusa, Medicago denticidata (casual), Epilobium tetragonum, 

 Galium elongaturn, G. erectum, and Apera Spica-venti. 



Of the seventeen plants found in sixteen counties only, we have 



