134 FLORA OF OXFORDSHIRE. 
7. Thames. Near Caversham Bridge, A, Fr. 
Berks. Pond at foot of Winter Hill, Brit. 
The submerged leaves of this are very different from those of fluviatilis, 
having capillary diverging segments as finely cut as those of Fennel. In 
the Ray on Otmoor this occurs to the exclusion of fluviatilis, and the plants 
grow in water at least two feet deep, when the submerged leaves alluded 
to are freely produced, but,soon rot off. 
.. fluviatilis, Cole. 
Top. Bot. 198. Syme, E. B. iv. 131. 599. Nym. 297. 
Native. Lacustral. Streams. Common in all the larger streams, and 
much more abundant than @. Phellandrium. P. July—Sept. 
First record, Dillentus 1726, and first as British Millefolium aquat. 
Matth. Ed. Vulg. Aquat. foliis Coriandri Matthioli, J. B. iii. See Ray, 
iii. p. 216, ‘in rivulo inter Woodstock et celebrem illum pontem Ducis 
Marlborugii juxta Blenheim.’ 
- 3. Swere. Cherwell near Banbury, Somerton. 
4, Ray. Plentiful in some parts of the Cherwell and Isis. Much more 
frequent than Phellandrium, H. Bos. in Phyt. Parsons’ Pleasure, 
T. Thurland. Oxford, Hb. Lawson. Ditches near Upper Heyford, 
Marston, etc., rather common. 
5. Isis. Port Meadow, Hd. Br. Mus. col. W. T. Dyer, see Journ. Bot. 
ix. 146. Isis about Oxford. Abundant in river from Kelmscott to 
Oxford; in shallowish water flowering freely. 
6. Thame. Thame river, Hb. Bx. Chiselhampton, Dorchester, Sand- 
ford, etc., common. 
7. Thames. Pangbourne, Whitchurch, Caversham, Newb. Common 
in the Thames from Oxford southwards. 
Berks. River Ock, Thames, and Loddon. 
When growing on mud and wholly out of the water, the leaves of this 
plant retain the characteristic leaf cutting, so different in outline from the 
preceding species. 
G. crocata, L. Hemlock Water-Dropwort. 
Top. Bot. 197. Syme, B. B. iv. 129. 597. Nym. 297. Bx. 160. 
Native. Paludal. Marshy places. Most rare. P. July—-Aug. 
First record, Stb. 1794. 
4. Ray. Near Bayswater, Sib. extinct. 
7. Thames. Near Caversham, F. Tufnail. 
Berks. Sulham. Bucks, Northants absent. Gloster W., Warwick. 
The extreme rarity of this plant in Oxfordshire will surprise botanists 
from the western counties. Its thinning out so rapidly up the Thames 
valley is remarkable. 
