The Scottish Naturalist. 



3^3 



S- ambigua Ehrh. {repens x auritd). Seems to occur wherever 

 the parent species grow in proximity ; but, though widely 

 distributed, it is not very common in the district. 



S. Cinerea-repens Wimm. Plants which may be this hybrid 

 have been found at Restenet and in Clova ; but, as I have 

 not seen flowers, the determination is doubtful. 



S. nigricans-repens Heidenr. A few plants have been found 

 on the banks of the Tay and of the Garry. 



S. laurina Sm. (phylicifolia x Caprea). If this occurs at all in 

 the district, it must be rare. I have seen willow speci- 

 mens from Killin and Clova which may possibly belong to 

 it. 



S. Wardiaxia (Leefe MS.), B.W. (phylicifolia x cinered). A 

 puzzling hybrid, of which a few bushes grow near Perth. 



S. ludificans B.W. (phylicifolia x aurita). One or two bushes 

 on the banks of the Tay above Dunkeld. I have also 

 seen imperfect specimens from Clova which are probably 

 this hybrid. 



S. tephrocarpa Wimm. A remarkable willow, found by Mr. 

 C. MTntosh near Dunkeld, seems to be this form. Its 

 parentage may be phylicifolia x Caprea x ci7ierea. 



S. latifolia Forbes {nigricans x Caprea). Rare. Near Perth 

 and Dunkeld, and perhaps also in Clova. 



S. Strepida Forbes {nigricans x cinerea). Also rare. Banks of 

 the Tay and some of its tributaries. 



S- COriacea Forbes {nigricans x aurita). Rare. Banks of the 

 Tay above Dunkeld. 



S. Dicksoniana Sm. {Arduscula x phylicifolia ?) Now known 

 only as a cultivated plant, though probably originally found 

 on the Breadalbane hills. It is an interesting form, whose 

 re-discovery in a wild state is much to be desired. 



S- Smithiana Willd. Under this name are included the hybrids 

 made by the crossing of S. viminalis with members of the 

 Caprece group — i.e., S. Caprea, S. cinerea, and S. aurita. 

 The hybrids of S. viminalis with each of these should be 

 considered separately ; but, from the difficulty of ascer- 

 taining the parentage, it is necessary to take them together 

 and place the various forms as varieties of S. Smithiana. 

 The cause of the difficulty of determination is probably 

 due, in part at least, to the fact that some of the forms 



