

■ 











.' 















have 



BEVISION OF THE BRITISH WILLOWS. 359 



lition, especially since the $ only is known. Of 



to those recorded in ' Top. Bot.' ed. 2 : 



57, Derby (C. Bailey) ; 77, Lanark (B. McKay) ; 88, Mid 

 Perth ! ; 89, East Perth ! ; 92, South Aberdeen (Trail). 



Group 2. Pentandejb 

 2. Salix pentandba., L. 



Of 8. pentandra, Andersson distinguishes three leaf- forms : 

 latifoUa, with leaves whose length is two or three times the breadth; 

 angustifolia, with leaves three to five times as long as broad and 

 narrower at the base ; and microphylla, with thin leaves scarcely 

 more than one inch long. He remarks that latifolia is more usually 

 shrubby, and angustifolia generally arborescent, and thinks that 

 as the latter is the prevalent North -Lapland form, it indicates 

 that the home of the species is in the north (Sal. Lap. p. 15). 







-. 



Walker-Arnott's experience (and also mine) is that, in a wild 

 state m Britain, 8. pentandra is a bushy shrub ; but that when 

 cultivated it becomes a tree, with broader and larger leaves than 

 those of the wild plant, in specimens of which from the same marsh 

 they vary much in size and shape. 



Besides the leaf-forms there is also considerable variation in 

 the size of the catkins ; but in neither case are these characters of 

 sufficient importance to deserve varietal rank. 



In Britain both the modifications latifolia and angustifolia 

 occur, though many specimens cannot well be referred to one 

 more than the other ; but comparing British examples with Con- 

 tinental — of both of which I have seen a rather large series — it 

 would seem that in Britain there is a greater tendency for the 

 plant to be broader-leafed than in Continental Europe. Indeed, 

 ttany specimens from the latter would scarcely, so far as the 

 leaves go, be recognized, at the first glance, as pentandra by a 

 British botanist. 



In the Linnean Herbarium there are two sheets devoted to 

 S. pentandra. On one, labelled by Linne "3. pentandra,' 9 the 

 o example is, without doubt, pentandra; but the $ seems a 

 httle doubtful. The other sheet bears, in Linne's writing, "Salix 

 pentandra;' to which Smith has put a " ?," and has also a label, 

 P a . now unk nown hand, "Salix pentandra, Flor. Lap. 370. 

 ns 8u btus cinereis." The specimen is $>, and seems more 

 hke & triandra than anything else. 



•Lastly, it must be noted that Andersson describes the rhachis of 



. 



