510 LEMNACEAE 



5. Loddon. Swallowfield, Bobart. Windsor Great Park by tho 

 Cascade, Light/oot MSS. 1762 (the actual locality is in Surrey). 

 Bishanij Melvill. Near Henley, frequent by Park Place, Stanton. 

 By Loddon Bridge, Salmon. Plentiful by Virginia Water. By 

 the Loddon side not infrequent. Arborfield. Wargrave, Near 

 Hurley. Near Bray. Windsor. Frogmore. Binfield. 



It is recorded for all the bordering counties except E. Gloucester- 

 shire. 



LEMNACEAE, Duby Bot. Gall. i. 553 (1828). 



LEMNA, Linn. Gen. 923 [Lenticula, Mich.). 



Zi. trisulca, Linn. Sp. PI. 970 (1753). Ivy-leaved JJuckioeed. 



Top. Bot. 426. Syme, E. B. ix. 17, t. 1394. Nyman, 756. Fl. Oxf, 314. 



Native. Lacustral. Ponds, ditches, principally of stagnant water. 



Not uncommon in low situations. A. June. 

 First record. In Britten's Contr. 187 1, but without locality. 



1. Isis. Buckland. Buscot. Cumnor. Appleford. Wytham. 



2. Ock. Dench worth. Wait. Kennington. South Hinksey. Radley. 



Abingdon. Marcham. Challow. Wantage. Cholsey. Apple- 

 ford. Uffington. 



3. Pang. Englefield. Purley, Tuftiail. Pangbourn. Bucklebury. 



Between Tilehurst and Reading. 



4. Kennet. Mortimer, Tufnail. Southcote. Benham. Padworth. 



Aldermaston. 



5. Loddon. In the Lake at Park Place, Stanton. Sonning Meadows, 



abundant in all the ditches, Tuftiail. Winkfield. Bray. Cole- 

 man's Moor. Euscombe. Bisham. Virginia Water. Windsor 

 Park. Frogmore. 

 Lemna trisulca is found in all the bordering counties. 



li. minor, Linn. Sp. PI. 970 (1753). Common Duckweed. 



Top. Bot. 425. Syme, E. B. ix. 21, t. 1395. Nyman, 756. Fl. Oxf. 315. 

 Native. Lacustral. Ponds and ditches. Abundant in all the dis- 

 tricts. P. June-July. 

 First recorded in Mavor's Agr. Berks, 1809. 

 It is found in all the bordering counties. 



Ii. gibba, Linn. Sp. PI. 970 (1753). 



Telmaiophace gibba, Schleiden in Linnaea, xiii. (1839) 391. 

 Top. Bot. 425. Syme, E. B. ix. 22, t. 1396. Nyman, 756. Fl. Oxf. 315. 

 Native. Lacustral. Ponds and ditches of stagnant water. Local. 



P. June-August. 

 First record, without locality, in Britt. Contr. 187 1. 



1. Isis. Near Wytham. Shrivenham. Cumnor. 



