Conclusion. 



The speculations find deduetions regarding the origin of new species and 

 variefcies, which I have given in my examinations of the scandinavian brambles, 

 ean perhaps be of interést even to others, besides those who oecupy themselves 

 raore particularly witli the study of this genus. I shall therefore collect the 

 general results, as well as the examinations by which they are supported. 1 

 shall also in each particular case refer the reader to that portion of my trea- 

 tise, that contains the facts, on which the general conclusion is grounded. 



1. llu n nrr but a small number of brambles, that have had the power 

 to produce any noteworthy forms on the Scandinavian peninsula. The variabi- 

 lity of other species is here so limited, that it has only given origin to acci den- 

 tal or unimportant modifications. Other species, again, nrr almost completely 

 unchanged. To the first category belong the brambles that here have a compa- 

 ratively wide < vtension, and therefore also grow in many differently constituted 

 localities. Also certain species can be referred to it, that here have no great 

 > ctension, but, in conseqüence of the natural conditions in the country, harr 

 produced new species or harr been i/nife iransfor med into new ones, so that the 

 original species no longer remains. To the next category belang, in general, 

 such species whose immigration to this country dates from a låter period, and 

 which here Inur not so wide a geographical extension. To the third category, 

 again, (hese specirs can be referred, which are either of a comparatively great 

 age or are very new to our country. In the last mentioned case they arise on 

 ont or some few spöts, which in their Constitution coincide with those from 

 which they came. 



It is in particular R. corylifolius (page 4'.)— 1 1 I), insularis (page 139), 

 glandulosus (page 119 — 125) and fruticosus (page L59 — 165), that have here 

 produced uew species or any great number of varieties. That is the case 



