364 The Scottish Naturalist. 



have arisen from the crossing of the hybrids either with 

 one of the parents or with another species. The forms 

 which occur in the district are — 



1. S. stipularis Sm. Near Perth, but not common. This has 



probably originated from the crossing of S. viminalis with 

 viminalis x Caprea. 



2. S. sericans Tausch. Not uncommon in Perthshire. In its best 



form this is viminalis x Caprea, but some states of it seem 

 to have a strain of cinerea as well. 



3. S. ferruginea G. And. Near Perth, but rare. This may pos- 



sibly be S. viminalis x aurita. 



The two other British forms — S. velutina (viminalis x 

 cinerea) and S. acuminata (viminalis x Caprea x Caprea ? ) 

 — have not yet been found in the district. 

 S. Stephania B.W. A pretty little willow, from Glen Lochay 

 in Perthshire, which seems to be a hybrid between lanata 

 ' and herhacea. 



S. spuria Willd. (lappmum x Arhuscula). In several places on 

 the Breadalbane hills. 



S. saxetana B.W. A few plants on Ben Laoigh, Perthshire. 

 It seems to be Myrsinites x aurita. 



S. Wahleilbergii And., (Myrsinites x nigricans). Found in 

 Breadalbane, Clova and Braemar. 



S. serta B.W. An old specimen from the " Breadalbane moun- 

 tains." Seems to represent a hybrid between Myrsinites 

 and Arhuscula, and I have described it under the above 

 name. 



S. Moorei "Watson, L.C." {nigricans x herhacea). An Irish 



willow, which is also reported to have been found on the 



Sow of Athole in Perthshire. 

 S- simuiatrix B.W. Appears to be herhacea x A rhuscula, and 



occurs, though very rarely, on the Breadalbane hills. 

 S. SObrina B.W. Probably herhacea x Lapponum. Ben Chat in 



Perthshire, and Clova in Forfarshire. 

 S. Margarita B.W. Almost certainly a hybrid between herhacea 



and aurita. Near Ben Challum in Perthshire. 

 S. semi-reticulata B.W. A puzzling willow (from Meall 



Ghacrdie, Perthshire) — which seems to be reticulata x 



nigricans. It much resembles the Sutherlandshire S. 



Grahami Br. (herhacea x phylicifolia). 



