INTRODUCTION XCl 



P. syhritica, Veronica montana, Calamintha officinalis, Nepeia Cafaria, Lawiinn 

 incisum, Uiricularia vulgaris, Hottonia, Daphne Laureola, Carpinus, Hydro- 

 charis. Orchis militaris, 0. pyramidalis, Habenaria conopsea, H. chloroleuca, 

 Ox)hnjs apifera, 0. muscifera, Keotfia, Epipactis latifolia, E. media, Cephalanthera 

 pa^hns, Iris foetidissima, Allium vineale, Juncoides Forsteri, Car ex Pseudo- 

 cypcrus, C. vesicaria, Koeleria, Fesfuca rigida, F. sciuroides, Elymus europaeus, 

 Asplenium Ruta-muraria, &c. 



Near Maidenhead there is an extensive piece of common ground 

 called Stubbing's Heath or Maidenhead Thicket, in which there is an 

 entrenchment dating probably from Celtic times. The Thicket was a 

 haunt of highway robbers as late as Leland's time. It lies on a clay 

 and gravelly soil, and is not particularly rich in plants. Among those 

 which have been found on it are Viola Reichenbctchiana, Rosa nibiginosa, 

 R. verticillacantha, R. systyla, Rubus pxdcherrimiis, R. Radida, R. Geleriii, 

 R. pyramidalis, R. villicaidis, Hyoscyamus, Hijpericum monianum, Salix 

 repens, a form of Gentiana Amarella, Filago sjxithidata, and Ranunculus 

 parvijlorus. In the vicinity is Pinkney's Heath, where the hedges have 

 Carpinus and Pyrus Aria, and the grassy common Trifolium subteiraneum. 



The railway cutting between Maidenhead and Bourne End affords 

 a profuse growth of Lactuca virosa, while Lcdhynis latifolius, Kentranthus 

 ruber, Sedum rejlexum, &c., are completely naturalized. Nearer the 

 Maidenhead Station, on the main line, many other adventitious plants 

 have been found, such as Crepis taraxacifolia, Lepidium Braha, L. ruderale, 

 Erigeron canadense, Melilotus alba, M. indica, M. arvensis, Anthemis tinctoria, 

 Panicum Crus-galli, Bunias oiienialls, Artemisia Absinthium, Enica saliva, 

 Oenothera odorata, Salvia nemorosa, and S. verticillata. 



At Twyford, on the heathy ground near the Station, Anthemis nohilis, 

 Trifolium striatum, T. filijorme, T. scabrum, Filago apjiculata, Viola canina, 

 and many forms of Brambles have been noticed. The hedges in the 

 vicinity are often adorned with handsome bushes of Rosa systyla, var. 

 stylosa, and Dipsacus lyilosus is found by a damp hedge-bank. 



The meadows between Bray and Windsor have a variety of GaHum, 

 which in this flora I have referred to G. erectum. Lactuca virosa is ra,thev 

 frequent in some gravelly fields near Bray. 



The walls of Windsor Castle afforded a habitat in former times for 

 a considerable number of jDlants ; in the seventeenth century Dr. 

 Manningham gathered a variety of Polypodium vulgare there, and in the 

 early part of the eighteenth century Dr. Lightfoot noticed Diplotaxis 

 tenuifolia on the walls of the King's Walk, but the stone-work is now 

 too well pointed to allow of the grow^th of much mural vegetation. 

 The walls overlooking the cloisters are partly in shade, and Linaria 

 Cymbalaria, Kentranthus ruber, Lactuca muralis, and Asp)lenium. Ruta-muraria 

 have been noticed there. In the Home Park, and in some parts of 

 the private grounds, Medicago arabica is very abundant ; Campanula 



