258 Dr F. Buchanan White's Additional Notes on 



in all the localities. Indeed there are in the herbarium 

 specimens of S. aicrita from Colinton. 



The hybrid >S. aurita-Lapponurii, Wimm. {8. Lmstadia-nxi, 

 Hartm. ^ opaca, 2° suhaurita, And.), has been found in both 

 northern and central Europe. Its characters show a com- 

 bination of those of its parents, but it much resembles the 

 hybrid of cinerea with Lapponum, from which the rugosity, 

 especially of the young leaves, best distinguishes it and 

 indicates its affinity with S. aurita. Since its parents not 

 unfrequently grow at no great distance from each other on 

 many of the Highland hills, its occurrence in Scotland might 

 be expected, but previous to these Edinburgh specimens I 

 had seen one only which might possibly be it. This is a 

 specimen of a willow — in Kew Herbarium — collected by 

 Lightfoot, but without locality or date. 



The hybrid with S. cinerea, S. cinerea-limosa, Lsestad 

 (S. cinerea- Lapponum, Wimm. ; ^. Lccstadiana, Hartm. /3 opaca, 

 1° suhcinerea, And.) is a much rarer form, and has been found 

 in northern Europe only. The Carlowrie specimen, which I 

 am inclined to refer to this, has numerous $ catkins, but the 

 leaves are only quite young. It is very like S. aurita- 

 Lapponum, but I think that from the densely black-pubescent 

 twigs, the abundant rusty cinerea-like hairs on the under side 

 of some of the leaves, and the absence of the rugosity of ^S*. 

 aurita, that the latter species has been replaced by >S'. cinerea. 

 It is much to be wished that the plant could be rediscovered. 



S. latifolia, Forbes. — Of this — which is a hybrid between 

 S. Caprea and S. nigricans — there is a specimen labelled 

 " S. W. corner of Duddingston Loch, a small tree 16 feet 

 high," but without date or collector's name. This hybrid 

 seems to be of rare occurrence. The majority of the few 

 British specimens I have seen were collected in Perthshire. 



>S^. Sadleri, Syme.-^Having, during the past summer, found 

 in Perthshire a hybrid between >S^. lancda and S. reticulata (or 

 what seems almost certainly so), I have again made a 

 study of 8. Sadleri. S. Sadleri has been supposed to be a 

 hybrid of S. lanata with >S'. reticulata, and for lack of a better 

 explanation of its origin, I was content to temporarily accept 

 it as such, though its affinity with re^icw/a to is extremely obscure. 

 I now think that it must be regarded as a variety of S. lanata, 

 and not as a hybrid form. By a " variety " amongst willows I 



