THE BRITISH WILLOWS 41 



having more slender twigs and smaller, shorter buds ; leaf-blades 

 smaller and more distinctly serrate in the upper half, tip twisted ; 

 stipules broader, short, and more cut ; catkins and ovaries of 

 smaller size, bracts more oblong and obtuse, and rather ferru- 

 ginous below the discoloured tip ; or at least in some of these 

 characters. 



It diverges from S. aurita in having rather stouter twigs and 

 longer buds, larger leaves with more persistent soft clothing, a 

 less serrate or rather crenate-serrate margin, the upper surface 

 smoother ; stipules less reniform, more acuminate ; catkins and 

 ovaries rather stouter and larger, the bracts (or some of them) 

 more pointed. 



S. aurita x caprea is a scarce and local hybrid ; the two 

 species do not commonly occupy the same sort of locality. It has 

 been recognized from Dorset, Somerset, Kent, Surrey, Norfolk, 

 Herefordshire, Worcestershire, Staffordshire, and Derbyshire, in 

 England ; from Mid-Perth, in Scotland ; and Westmeath, in Ire- 

 land. Europe : France, Belgium, Scandinavia, Germany, Switzer- 

 land, Austria, Moravia, Galicia. 



SALIX AUEITA X CINEREA. 



Syn. S. cinerea-aurita Wimmer, Flora, xxxi. 329 (1848). See- 

 men, iv. 216.— S. multinervis Doell, 516.— S. lutescens Kerner, 

 Nied. Oesterreich. Weid. 253 (1859). B. White, Eevision, 383.— 

 S. aurita-cinerea Wimmer, Sal. Eur. 202.— S. aurita x cinerea 

 Camus, Monogr. 324. 



Icon. Camus, Atlas, pi. 30, s-y. 



Exs. Leefe, Sal. Brit. exs. Nos. 38, 41, 42 ; Sal. exs. iii. 77. 

 Wimmer, Sal. Eelict. (Coll. Sal. Nos. 27 (S. cinerea), 173 b (S. 

 cinerea x viminalis) ), 181. Hb. Beeby, No. 78. Hb. B. W r hite, 

 No. 433 (S. caprea x cinerea), and several sheets labelled S. 

 lutescens. E. F. & W. E. Linton, Nos. 16, 17. 



A very frequent and variable hybrid, flowering in April, best 

 determined by recognizing the tokens of the two parents. It 

 shows the influence of S. aurita in one or more of the following 

 features : twigs more slender and glabrous than in S. cinerea ; 

 buds more curtly oval and glabrescent ; stipules broader and more 

 dentate; leaf-blades of a thicker texture, often subrugose and 

 smaller ; catkins smaller and slenderer, bracts narrower, more 

 ferruginous, blackening less ; ovaries smaller, whiter. 



The traces of S. cinerea may be found in the stouter, more 

 torulose twigs, which are more persistently pubescent than in 

 S. aurita ; buds more pubescent, longer ; stipules more rounded ; 

 leaf-blades larger, harsher to the touch ; catkins larger in all their 

 parts ; bracts more broadly obovate, with more blackened tips. 



While the hybrids vary in all these characters, and conse- 

 quently are far from being all much alike, plants and specimens of 

 it commonly have more of a look of S. cinerea than of the other 

 parent, and are sometimes difficult to distinguish with certainty 

 from S. cinerea forms. 



B. White (Eevision, pp. 384, 385), after pointing out that many 



Journal of Botany, July, 1913. [Supplement.] e 



