Dr F. Buchanan White's Notes on Willows. 257 



Additional Notes on WiUoics in the University Herbarium. 

 By r. BucHAXAX White, M.D, F.L.S. 



(Read 12tli December 1889.) 



In the notes on Willows in the University Herbarium, 

 which I had the honour of submitting to the Society last 

 session, I mentioned the existence of a specimen of Salix 

 Lapponum, collected by Greville at Colinton near Edinburgh, 

 which as it has $ catkins, dispelled the sHght doubt, as to 

 the species, suggested in the " Student's Flora." Since the 

 notes in question were in type some additional specimens of 

 willows have been found in the herbarium, and have been 

 kindly submitted to me by Professor Bayley Balfour. 



Amongst these are three more specimens of Salix 

 Lapponum from the Edinburgh district, and three specimens 

 of hybrids of that species. The collector's name is not 

 mentioned, but the writing is, I think, that of the late 

 Professor J. H. Balfour. 



The examples of 8. Lapponum include two from " near 

 Craigcrook, 1832," and one from "Dalkeith Woods, 19 May, 

 1838." 



The hybrids are with >S^. aurita and with S. cinerea. Of 

 the first there is a specimen with a $ catkin from Colinton, 

 and another (which, though it has no flowers, is from the 

 structure of the leaves scarcely doubtful) from Craigcrook. 

 The S. cinerea hybrid is labelled as from " Carlo wrie, 1838." 



We have thus proof that Salix Lapponum has been gathered 

 in three localities near Edinburgh, namely, Colinton, Craig- 

 crook, and Dalkeith Woods, whilst the occurrence of a hybrid 

 of it at Carlo wrie suggests that it also grew there. 



Considering that this species very rarely occurs as a wild 

 plant below an altitude of 2000 feet above sea-level, I fear 

 that there can be little doubt but that it is only an introduced 

 plant in these localities. Whether it is still to be found 

 the investigations of local botanists must decide. 



But though the nativity of the species must be regarded 

 with suspicion, there is no good reason why the hybrids 

 should not be of spontaneous origin. S. aurita and *Si. 

 cinerea are both common willows, and probably grow or grew 



TRAXS. EOT. SOC. VOL. XVIU. 2 H 



