POPULUS 461 



*P. CANESCENS, Sm, Fl. Brit. iii. 1080 (1804), E. B. t. 1619. Grey Poplar. 



P. alba, Mill. Grard. Diot. ed. 8 (1768), not of Linn. P. alba x tremula. 

 Comp. Cyb. Br. 313. Syme, E. B. viii. 194, t. 1300. Nyman, 663. Fl. Oxf. 269. 

 Denizen. Septal. Sylvestral. Wet woods, hedges, &c. Not tinconinaon, 



and scattered through all the districts. Tree. March- April. 

 First recorded by Mr. J. Lousley in RuaselVs Cat, 1839. " 



1. Isis. Eynsham. Cumnor. Wytham. Buckland. Buscot. Shrivenham. 



2. Ock. Very common in Blewbiiry and raost of the villages in the Vale, 



Lousley. Marcham. Didcot. Boar's Hill. Abingdon. Appleford. 

 Near Wittenham. 



3. Pang. Hampstead Norris, Lousley. Tidmarsh. 



4. Kennet. Weston, Osmond. Aldermaston. Greenham. Padworth. 



5. Loddon. Euscombe. Near Twyford. Wargrave. Near Bousey Mill. 

 P. canescens occurs as a planted tree in all the bordering counties. 



P. tremula, Linn. Sp. PI. 1034 (1753), and of C. B. Pin. 429. Aspen. 



P. Lijbica, Gerard. 

 Top. Bot. 373. Syme, E. B. viii. 196, t. 1301, Nyman, 664. Fl. Oxf. 269. 

 Native. Sylvestral. Woods, hedges, heaths, &c. Rare in the north, 



but not unfrequent in the south-w^est of the county. Tree. 



March-April. 

 First record. P. tremula, Mavor's Agr. Berks, 1809. 



1. I.sis. Wytham. 



2. Ock. Dry Sandford. Marcham. Steventon. Tubney. 



3. Pang. Hermitage. Westbrook, W. M. Rogers. Petty's Copse. 



Tidmarsh. Sulham, Tiifnail. Streatley. Tilehurst. Fence 

 Wood, Buckle bur j\ 



4. Kennet. Wiekham. Sheflford. Inkpen. Aldermaston. Hamp- 



stead Marshall. Mortimer. 

 .5. Loddon. Wellington. Sandhurst. Ambarrow. Finchampstead. 

 Bearwood. Early. Wokingham. Bracknell. Windsor Park. 

 Ashley Hill. 

 Two varieties of this tree are recognized, namely, var. glabra, 

 Syme, 1. c, with the young leaves sub-glabrous or glabrous, which 

 occurs at Marcham, Tilcombe Green, Finchampstead, Sandhurst, 

 &c. ; and the second, our commoner form, and one which is very 

 often planted, is the var. villosa (Lang in Syll. Soc. Ratisb. i. 185, 

 as a species), as at Bisham Wood, &c., in which the young leaves are 

 densely silky. 



P. tremula is recorded for all the bordering counties. 



*P. NIGRA, Linn. Sp. PI. 1034 (1753), and of Gerard. Black Poplar. 

 Comp. Qy\>. Br. 561. Syme, E. B. viii. 198, t. 1302. Nyman, 664. 



Baxt. t. 506. Fl. Oxf. 269. 

 Denizen. Sylvestral. Hedges, plantations, &c. Not uncommon as 



a planted tree ; in all our river valleys, and a conspicuous feature 



in the scenery of the Thames and Kennet valleys. It attains to 



a considerable size. March. 



