FLORA OF OXFORDSHIRE. 285 
4. Ray. Bicester, Blackthorn, Headington Wick, Kidlington. 
5. Isis. Christ Church Meadow, Hd. Br. Canal, H. Bos. Binsey, 
Port Meadow, Wychwood, Minster Lovell, North Leigh, a very 
large form in river near Tumbling Bay Oxford, Bampton, Clanfield. 
6. Thame. Cowley, Thame, Br. Oxford. 
7. Thames. Caversham. 
Berks. Frilford, Ferry Hinksey. 
This plant varies much in size, being sometimes so dwarfed as to appear 
like Elodea. 
P. compressus, L. (non Sm.) P. zosterefolius, Schum. 
Top. Bot. 415.‘ Warren.’ Syme, E. B. ix. 46. 1415. Nym. 683. 
Native. Canals andrivers. Local. P. June-Aug. 
First published record, Prof. Lawson, 1870. Mr. Westcombe found it 
about 1850. 
3. Swere. Hardwick Canal, Bodicote, A. Fr. Neithrop, Walford. 
4. Ray. Kirtlington Canal. 
5. Isis. Canal Oxford, Rev. R. Linton! Near Fawler, T. Westcombe. 
6. Thame. Isis at Oxford, M.A. Lawson, Journ. Bot.ix.16! Sandford, 
Hb. Lawson! Nuneham, H. Bos. ‘gramineum.’ Iffley, just below 
the Mill, fruiting freely. 
Berks. Marcham, Sandford. Bucks, Northants, Warwick. 
Dr. Trimen suggested the above was Sibthorp’s P. gramineum, but I 
believe that to be P. Friesit. 
[P. obtusifolius, MW. K. 
Top. Bot. 415. Oxford. Syme, E. B. ix. 48.1417. Nym. 683. 
Berks (?). Northants, Wakefield Pond. Gloster E. (?). Warwick. 
I know of no Oxford locality or record, although it is likely to occur.] 
P. Friesii, Rup. P. mucronatus, Auct. 
P. gramineum, (L.) Sib. P. compressus, Sm. non L. 
Top. Bot. 214, Syme, E. B. ix. 49. 1418. Nym. 683. 
Native. Ponds, canal, shallow streams. Locally common. P. July. 
First certain record, the Author, see Rep. of Rec. Club, 1880; but it is 
probably the gramineum of Sib. and compressus of Beesley and Walker. 
8. Swere. Broughton Moat, Canal! brook between Cherwell and 
Canal, river in Mill Meadow (entered as pusillus in Banbury list), 
T. Bees. Canal Somerton, etc. 
4, Ray. Kirtlington, and common on the shallow margin of Canal. 
5. Isis. Binsey Common! ditches by the roadside going to Port 
Meadow, Sib. ‘gramineum.’ Canal between Oxford and Wolver- 
cote, see Rep. of Rec. Club, 1880. Osney. 
6. Thame. Between Oxford and Iffley. 
7. Thames. Moulsford. 
Berks. Marcham. Bucks, Gloster E., Northants, Warwick. 
