The Scottish Naturalist. 



365 



S. Sibyllina B.W. Probably reticulata x Lapponum. Found 



by Dr. Greville in 1824 near Loch Brandly in Clova. 

 S. SUperata B.W. From Glen Lochay, Perthshire. Appears to 

 be reticulata x lanata. 

 There are two other Scottish hybrids of S. reticulata which 

 ought to be looked for. One (S. sejuncta B.W.) was collected on 

 Ben Lawers by R. Brown in 1793 ; the other (S. soluta B.W.) is 

 labelled 11 Scotland, Herb-Lambert" but most probably came from 

 some part of our district. 



S. rubra Huds. ( purpurea x viminalis). Common, in various 

 forms, near Perth ; and also occurs in other parts of the dis- 

 trict. 



S. SOrdida Kern, (purpurea x cinerea). Locally common near 

 Perth. 



S. Doniana Sm. (purpurea x repefis). First described, though 

 not recognised as a hybrid, by Smith from plants " sent 

 from Scotland as British " by George Don. Since then it 

 has been retained in our books as a doubtful native only ; 

 and when I began this paper I was unwilling to accept it as a 

 British willow. I have now found it on the bank of the 

 River Tummel in Perthshire, so it must be re-admitted to 

 our lists. It is of much interest as a probable confirmation 

 of one of Don's " reputed " discoveries ; and its re-discovery 

 will I hope encourage the search for those other plants of 

 Don's which have not at yet been found by other botanists 

 in Britain. 



These 40 hybrids comprehend the majority of the hybrids known 

 to occur in Britain ; but, almost certainly, do not exhaust the list 

 of those which inhabit the district. Whilst some hybrids are neces- 

 sarily of not unfrequent occurrence, others, from the circumstances 

 under which alone they can be produced, must always be rare, and 

 hence so long as there are only a few students of the genus, they 

 may escape detection for a long time, if not altogether. This is 

 especially the case with the alpine forms, some of the known plants 

 of which are solitary bushes many miles apart from each other. 



In conclusion, I have two things to which I wish to direct the 

 attention of members. 



In the first place, too much stress cannot be laid upon the im- 

 portance of securing good and perfect specimens when collecting 

 willows. A perfect specimen must have both flowers and adult 



