





















































REVISION OF THE BRITISH WILLOWS. 355 



capsules with much shorter pedicels— all of which indicate a con- 

 nection with Salix alba rather than with 8. fragilis — serve to 

 distinguish it. Its relation to 8. triandra is closer than to the 

 other parent ; but the structure of the scales and capsules, as 

 well as the pubescence of the leaves, when that is present, separate 

 it from that species. 



The name 8. triandra- alba, which might have been applied to 

 this hybrid — if its parentage was beyond doubt, — has already 

 been used by Wimmer for the plant generally known as S. undu- 

 lata. The latter hybrid is, however, now usually admitted to be a 

 hybrid of triandra with virninalis, and not with alba *. 



I have as yet found 8. subdola only on the west bank of the Tay 

 below Perth. 



Salix undulata, JEhrh. (S. triandra x S. virninalis.) 



Th 



"Wimmer 



that 8. alba and not S. virninalis was one of the parents of 8. un- 

 dulata, Ehrh. (=& lanceolata, Sm.), was more correct than 

 Andersson and the majority of salicologists, who hold the virni- 

 nalis theory, I am now persuaded that Andersson's view is the 

 right one. "Wimmer, indeed, at one time considered virninalis to 

 be a more probable parent than alba ; but latterly he altered his 

 opinion, though unfortunately he does not, in the ' Salices ' at 

 least, give his reasons for doing so. 



But whilst Andersson treats undulata as a distinct hybrid 

 between triandra and virninalis, he curiously gives an equally 

 independent position to another hybrid (for which he uses Doll's 

 name of multiformis) of the same two species, placing undulata 

 ln the Triandra, and multiformis in the Viminales. Doll more 

 correctly brings all the triandra-viminalis hybrids under one 

 n ame ; and his example I follow, using, however, the oldest name, 

 undulata, instead of the latest, multiformis. 



1 he forms— which have all been described as distinct species — 



thus brought together are 8. undulata, Ehrh., 8. lanceolata, Sm., 



' *™ ir «ni, Spr., S.hippopJiaifolia, Thuill., and 8. mollissima, Ehrh. 



Vh ? 0Ug k Ander sson and others adopt the view that 8. undulata, 



*h., and 8. lanceolata, Sm., are identical, there is really some 



ubt as to what Ehrhart's species truly is. Smith says that 



Whilst 



me still to 



of th* l triandra and & alba have both something to do with the parentage 



IS plant, more reCAntlT nKfni™*/! l A «™ a /4W™ vnnnir alinntja^ Rfrnnorlv lWftftll 







s > fragilis. It 



seems 



viridis 







triandra x S. alba) 



alba (i. e. S. fragilis 









