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very few places only, perhaps because it has not been carefully 

 looked for. In Britain it may not unreasonably be expected to 

 occur in those parts of the north where its parents grow together, 

 as they often do, since in Perthshire it is of wide, though not 

 of abundaut, occurrence on the banks of the Tay and some of 

 its tributary streams. I have found both sexes, but have seen 



recognized. 



are 



Mr 



has found plants which probably belong to Salix strepida, though 



the material I have seen is scarcely sufficient for absolute 

 certainty. 



X Salix cohiacea {Schleich.), Forbes. (S. nigricans x 



) 



cinerea-nigricans (S. strepida), "W 



says that it is hardly to be doubted that hybrids between 

 »• nigricans and 8. aurita occur. As examples of such he cites 

 8. conformis, Schleich., in Herb. Willdenow, and thinks that 

 V orbes's figure, t. 119, of S. grisophylla (Schleich.), Forbes, also 

 represents such a hybrid. 

 Anderssnn nffor. r.„^;„„ 



»/< 



Wiru iner 











nnis referred to is represented by three specimens, of 

 which two belong to 8. aurita and the third to 8. cinerea, and 



wh'V 116 8pecimens of S ' grisophylla, published by Schleicher, 



he has seen, are, as regards some, 8. nigricans, and, as 

 ^gards others, 8. cinerea. 



nuer the name S. aurita-nigricans, Heidenr., Heidenreich 

 p 8 distri buted specimens of a "Willow found near Tilsit in 



russia; but I am not aware that any description of it has been 

 published. 



Here and there, on the banks of the Tay between Dunkeld 

 and Logierait, Mr. C. M'Intosh and I have found plants which 

 appear to be certainly a hybrid between 8. nigricans and 8. aurita. 



gnt be expected, these bear a very considerable resemblance 



• strepida, and some of them, indeed, might be nearly as well 



to that hybrid, except for a certain appearance suggestive 



aunta rather than cinerea. Others, however, show a distinct 



tol w , 0n °^ *^ e characters of aurita and nigricans, and agree 



lerably well with Heidenreich's examples. 



ou gh Wimmer refers it to 8. nigricans, 1 think that Forbes'* 





' 



. 











