Lunds universitets årsskrift

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Lunds universitets, 1887 - Science
 

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Page 179 - Also -very many of the glandulous species are so nearly connected with each other, 'that it seems to me very likely, that in England they arose from a single species. 7. The new varieties or species, that arose from certain immigrant forms, have not developed gradually, but have arisen suddenly and, so to say, at once (page 29). The forms immigrated hither could not, at once on their arrival, have changed into new forms. They have certainly lived here for a longer time unchanged. But in time the...
Page 135 - ... said to recede from R. Arrhenii, in the direction of R. corylifolius, which has probably given origin to the Sprengeliani. I must, however, particularly emphasise that, although R. scanicus has several characteristics in common with R. Arrhenii, it, still, in the whole of its appearance, as well as in the shape of the leaves and in the nature of the inflorescence, is so well distinguished from this species, that it, with the same right, as most of the other forms of this genus, can be considered...
Page 156 - Comparison with mis material shows, that R. cordifolius differs from R, villicaulis, by the considerably smaller, more contracted and more contiguous inflorescence, the lower branches of which are rather short, the peduncles short and wanting the stalked glandules; the short pointed sepals, the broader, entire petals, whose edges, towards the base, at last, become turned down; the considerably longer filaments, the sharply, finely, and almost doubly serrate leaflets, which are much smaller; also,...
Page 181 - Further observations have led me to the opinion, that they immigrated from the continent and. therefore, are to be referred to A, g, 2. „ 38. The form of R. arcticus which has been mentioned and which is cultivated in the Botanical gardens in Lund, has white flowers and should, perhaps, more properly be referred to R. saxatilis or triflorus. „ 43. R. Areschougii was found by Dr. H. NILSSON in many places on the dried beach of Ring-gon, in central Skâne (June 1885).
Page 141 - I have had the opportunity, under the guidance of Dr. FOCKE, of becoming acquainted with the North German form, at Burg Lessum near Bremen, but this is separated from our form, by a more contracted, racemose inflorescence, by scantier hairiness on the underside of the leaves; also, by the flowering shoots being furnished with aciculi and glandules. Also the R. villicaulis, which I have seen growing in Schlesian near Streittberg, and even received from
Page 176 - Skâne, it settled down in such open small woods, and under these unusual surroundings became more susceptible to the prevailing climatic conditionss. Var. grandifolius of R. nitidus can also be given as* an example in this respect. What, however, seems to me most in support of my opinion, is, that some species and forms have been able to keep themselves almost completely unchanged, while others have changed considerably. Certainly, this can be partly explained thus, that the older species generally...
Page 173 - I think therefore, that the two above named parent species under the influence of outward circumstances could not keep unchanged, but completely passed over into the new forms. The species that show little or no inclination to produce any more constant varieties, are partly the herbaceous brambles (page 44 — 47), partly R. idseus (page 168) and R. suberectus (page 165), which are all, really, the oldest brambles in Europe. Among these species, probably R. saxatilis and idœus are preglacial, R.
Page 158 - Münteri, and under the influence of local circumstances has undergone the changes, which at present distinguish the Swedish form. R. relatus, on the contrary, I consider as a form of R. fruticosus which has arisen here, to repeat an expression, often used, a miscarried attempt of this species to produce R. cordifolius, and thus an intermediate form between this species and R. fruticosus. Especially in Northern and Central Germany, a number of forms...
Page 164 - R. suberectus, cabins, and corylifolius (page 18), yet, it has not here had power to produce any forms worthy of notice. This is the more surprising, as, otherwise, the same species in the western part of the continent has produced a number of forms, yes, probably given rise, not only to most of the species of Suberecti, but also to those of Cordifolii. In the introduction (page 26), it has already been laid down, that R.

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