Sonic Observations on fche Genus Eubus. 151 



which this author (I. e.) lins divided R. thyrsoideus, cannot be distinguished 

 from one another by any constant characteristics, this variety, by its almost 

 apright turiones, that are furrowed from tlie base, is to be referred to Focke's 

 R. thyrsanthus: 



Between this variety and the typical form, there are, certainly, no inter- 

 mediate forms, although they grow rather near to each other. IL thyrsoideus 

 is rather common in Bleking. On the place, however, where this variety 

 grows, no typical species is to be found, which nevertheless appears at the dis- 

 tance of some hundred feet. 



We have, therefore, a uew example of a peculiar form confined to one 

 spot, which, at a short distance from its locality, is accompanied by another 

 form which is so nearly related to it, that the genetic link between them 

 stånds as a natural and incontestible fact. Also in the present instance, 

 we find the same fact, that we have seen with respect to R. pallidua and 

 horridus (page 122), viz, that the new form does not grow intermingled with 

 ihe original one, but is removed more or less from it. The locality in which 

 the variety is found, is a thin oakwood on rather dry, rising ground. The 

 typical tonn grows in the neighbonrhood. in brushwood, and on rather open 

 places. The abscence of all intermediate forms completely contirms the previ- 

 ously assumed opinion, that the new forms arise, at once, not gradually, 

 new dispositions having been created from the influence of new local circum- 

 -tanees, they have attained sufficient strength to overcome the inherited tendencies. 



Gr. !). Cordifolii. 



l'.i. R. villicaulis Koehl. in Whe. & N. Rub. Germ. pag. 43; R. Selmeri 

 Lindeb. Herb. Rub. Scand. n. 33; turionibus arcuato-procumbentibus, sursum 

 angulatis & paulo sulcatis, sparse pilnsis, glandulis crebris, sessilibus aculeisque 

 numerosis, validissimis, e basi valde dilatata subito subulatis, reetis vol decli- 

 ii.iih, versus apieem curvatis, munitis; foliis ö-nato-digitatis — pedatis, subtus 

 Bubsei'iceis, pallide viridibus, argute & inajqualiter serratis; foliolo terminali 

 longe petiolato, suborbiculato, ad basin rotundato vel leviter cordato, abrupte 

 acuminato; foliolo terminali ramorum floriferorum late obovato, breviter & ab- 

 rupte acuminato; inflorescentia racemosa, plerumque composita & foliosa, süb- 

 cylindracea, glandulis crebris, breviter stipilaiis, obsita & aculeis numerosis, 

 validi-, lalcaiis munita: ramis elongatis &. subsequilongis, apice cymas 3-7-floras 

 entibus, pedicellis calycem longe BUperantibus, aculeis falcatis munitis; sepalis 

 ovato-lanceolatis, plerumque lon<;v appendiculatis, extus canescentibus, glandulösis 



Lunds Univ. Årsskrift. Tom. XML 20 



