

870 



PB. F. BUCHANAN WHITE S 



with Salix viridis and S. decipiens, and since it is possible that 

 (as in several Continental localities) it may be in some places 

 rarer than 8. viridis, it will be necessary to work out afresh its 

 distribution, though it probably occurs throughout. I have 

 specimens from the following counties: 



8, S. Devon (Archer Briggs) ; 16, W. Kent (E. Edwards) ; 17, 

 Surrey (E. S. Marshall) ; 19, N. Essex (Leefe) ; 20, Herts (B. 

 Daydon Jackson) ; 23, Oxford ( Q. O. Druce) ; 27 or 28, Norfolk ; 

 32, Northampton (Bruce); 34, W. Gloucester (J". M. White); 36, 

 Hereford (A. Ley) ; 37, Worcester (R. F. Towndrow) ; 38, War- 

 wick (T. Kirk) ; 40, Salop (Brighton) ; 47, Montgomery (Eyre 

 Parker) ; 57, Derby (0. Bailey) ; 64, M.W. York (J. G. Baker) ; 

 65, N.W. York (Ward); 66, Durham (Middleton) ; 80, Kox- 

 burgh (A. Brotherston) ; 83, Edinburgh (Maughan) ; 85, Fife ! J 

 87, W. Perth I ; 88 Mid Perth ! ; 89, E. Perth ! ; 90, S. Aberdeen 

 (Trail). 







4. Salix alba, L. 



Although Anderson describes eleven varieties or forms (the 

 majority, however, not being natives of Europe), and Wimmer 

 four principal forms, S. alba does not in Britain present any great 

 range of variation, with the exception of the remarkable modifi- 

 cation S. vitellina. 



Most of the British specimens which I have seen are in the 



direction of S. carulea, Sm., a form which in structural differences 



can be separated from typical S.alba only by its adult leaves being 



less pubescent. In other respects S. ccerulea, — probably the 



"Huntingdon AVillow " of arboriculturists, though Smith calls 



"Russelliana " the Bedford or Huntingdon Willow, — is said to 



differ from ordinary S. alba by its more rapid growth and the 



greater value of its timber, and hence would be selected for 



planting. Thus all our trees being probably self-sown escapes 



when not actually planted, would most naturally belong to this 

 form. 



There seems thus to be no good grounds for retaining ccerulea 

 as a variety. In its extreme form the adult leaves are nearly gla- 

 brous ; but between this state and the very pubescent form 

 argentea, Wimm. (S. splendens, Bray), all gradations occur. Of 

 the extremely pubescent form, I have seen no British examples. 



As regards leaf-form, there is some degree of variation in 



British specimens, but not so sufficiently marked as to deserve 







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notion. 



(in Sal. Exs.) 























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