RT 



Sonie Observations on the Genus Rubus. 



By 



F. W. C. ARESCIIOUG. 



iContinuecl from Vol. XXI.) 



An spite of these unessential differences, R. Radula is a -very constant 

 species in the Seandinavian peninsula and very distinct from all the other 

 species. Transitional forms between R. Radula and the rest of the species 

 do not at all exist. We must therefore conclude that it is a more 

 southern species, whieh not having arisen in Sweden has likewise not been 

 able to produce any varieties here. I think it very probable that it has immi- 

 grated inro nur country by way of Denmaik and the north of Germany. The 

 tolerably frequeni occurrence of that species in the islajjd of Bornholm and 

 in the east of Skåne and Bleking, as well as in the northwest of Skåne, make 

 this supposition very probable. In Skåne at least, it is still extending 

 very much. I have had the opportunity of making this observation in the east 

 of that province. 



The R. Radula growing in Üenmark and the north of Germany agrees 

 in all points with the Swedish form. In England that species is tolerably 

 well maintained, although its leaflets commonly are much smaller, white-felted 

 underneatli and of a rather oblong or subcuneate shape. Besides the branches 

 of the panicle and the peduncles are rather sparsely armed with shorter prickles, 

 and have fewer as likewise shortly stipitate glandules. In France it is 

 tolerably typical, but in England and France, as in most southern coun- 

 tries on the continent. there have arisen liumerous forms that combine that 

 species with other brambles. P. J. Müller & Wirtgen have described such 

 a form, from Coblenz on the Rhine, as a distinct species, by the name of R. 

 fimbrifolius. Focke (Syn. Kub. Germ. pag. •_>.'><>) considers that il is nearly 

 related to Et. Schlickumi, which is inciuded in tbe same gioup as R. egregius, 

 Focke. I'or my part I think that il hanlly admits of any doubt, that it is 

 only a local form of R. Radula. 



In consideration of the fact, thal II. glandulosus in western Europé, al 

 leaat, when it grows in the lowlands, i- modified in these particulars, vi/., 



Lunds Univ. Ar- krift. T XXII. W 



