XXXVI FLORA OF OXFORDSHIRE. 
R. diversifolius, Blechnum spicant, Aspidiwm spinulosum, A. 
dilatutum, Hieracium boreale, Carex ovalis, Agrostis canina, 
Callitriche pedunculata. 
The meadows about Bampton afford Witella opaca, Calli- 
triche obtusangula, Rosa mollis, Bromus commutatus and race- 
mosus. 
6. The Thame or Mid-Thames district is a portion of 
eountry about 13 miles long from Oxford to Mongewell, and 17 
wide from Culham to Bledlow, entirely in the Thames drainage. 
On the north it is bounded by the Ray district, which has an 
artificial border in the London road from Oxford to Forest 
Hill. The line then follows the watershed by Stanton St. John 
northwards, by Woodperry to Studley, where it joins the 
Buckingham border, marching with it southwards by Water- 
perry, Shabbington, Thame to Henton, here turning south-west 
thence the boundary is the lower chalk formation, which pro- 
ceeds in a well-marked line by the villages of Chinnor, Crowel, 
Aston Rowant, Lewknor, Shierburn, Pyrton, Brightwell. Salome, 
Brightwell Baldwin, Fyfield farm and Crowmarsh, to the 
Thames at Mongewell, which forms its western boundary, to 
Oxford. The Thames from Oxford to Sandford flows through 
meadows rich with Fritillaries, its banks are bordered with the 
sweet-scented Acorus, and its waters are inhabited by Potamo- 
geton prelongus, flabellatus and compressus, Zannichellia macro- 
stemon, Hnanthe fluviatilis, etc., and near Sandford appears for 
the first time in the river’s course the lovely Leucojum estivwm. 
Bendinground under the wooded heights of Nuneham to Abingdon, 
and curving again towards Culham, the stream finally separates 
itself from the Upper Oolites to enter the Cretaceous beds, here 
the Lower Green-sand, through whose conglomerate rock it 
cuts its way by picturesque Clifton Hampden to Day’s Lock, 
beloved by artists. Shortly after, opposite the northern side of 
bold Sinodun hill, comes in the Thame which owes its parentage 
to the Oolitic rocks of Quainton and Brill, and the lower chalk 
escarpments of Tring. The Brill water enters Oxfordshire near 
Studley Priory (a home of Aristolochia), meeting near Men- 
marsh Farm a small stream which has its origin on the north- 
eastern escarpment of the Coralline oolite plateau near Woodperry, 
the united streams flow in an irregular course between Waterperry 
