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REVISION OF THE BUITISH WILLOWS. 387 



and cinerea a river-bank species), but more especially because 

 their periods of flowering are not exactly synchronous. 



At the same time I think that the hybrid does occur, since I 

 have seen a few specimens which, if not to it, I know not where 



they belong. 



In Perthshire I have found several plants which, though not 

 good intermediate forms (some leaning to Salix Caprea and 

 others to S. cinerea), I can refer only to S. Beichardti. Other 

 specimens are from Fifeshire (in Edinburgh University Her- 

 barium), Worcestershire (B. F. Towndrow), and Kent (E. S. 

 Marshall). A plant from Kew Gardens, labelled 8. sphacelata, 

 Sm., seems also to belong here ; and a leaf-specimen from the 

 4 towing-path near Kew, Surrey" {E. De Crespigny) has leaves 

 which are quite intermediate between S. Caprea and S. cinerea. 



As Wimmer indicates, it is very difficult to point out in words 

 the characteristics of this hybrid ; and unless the student knows 

 well the essential features of Caprea and cinerea, he will scarcely 

 succeed in recognizing it, but rather place it as belonging to one 

 or other of its parents, between which, of course, the combinations 

 m ay be various. 



On account of the plate in Sal. Wob. (t. 127) and Doll's opinion 

 regarding Eng. Bot. t. 1437, "Wimmer thinks that 8. aquatic a, 

 km*, is a synonym of his 8. Caprea-cinerea ; but, as pointed out 

 uuder S. cinerea, I am inclined to believe that aquati ea is a hybrid 

 of write with probably 8. Caprea. 





X Salix capbeola, J. Kern. (S. Caprea* 8. aurita.) 



What has been said regarding the difficulty of identifying the 

 hybrids of & Caprea with 8. cinerea, applies with nearly equal 

 force to the hybrids of S. Caprea and 8. aurita. Like the former 



)e y, too, are not of common occurrence, since the periods of 

 flowering of the species are not quite identical. 



Iu a locality near Perth, where S. Caprea, 8. aurita, and S. 

 nnerea, as well as the hybrid between the two latter, occur to- 

 gether, I have found some plants which I believe are S. capreola, 

 though of different forms and not quite like any of Wimmer's 

 published specimens. Oue has slender branches resembling those 

 8. aurita; leaves thin, intermediate between S. Caprea and S. 

 a unta, and not unlike the Sal. Wob. figure of S. aquatica ; cat- 



,ns ( ¥ ) large ; capsules subulate from a broad base, with a short 















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