. The continental element in the flora of south Sweden. Plants. THE CONTINENTAL ELORA OE SOUTH SWEDEN 319. Fig. 13. The <listribution of \'iola rupestris in ihe Scandinavian North. O: uncertain occurrences. Fig. 14. The distribution of Ranunculus polyanthemos in the Scandinavian North. O: uncertain occurrences. rences. It agrees well with the occurrence of the species in north-eastern L'inland; Erom a rich distribution in large parts of South Einland (»In Eennia austraU et media plerumque satis frequenter», Hjelt) it stretches eastwards, with isolated occurrences high up in the north; it re
. The continental element in the flora of south Sweden. Plants. THE CONTINENTAL ELORA OE SOUTH SWEDEN 319. Fig. 13. The <listribution of \'iola rupestris in ihe Scandinavian North. O: uncertain occurrences. Fig. 14. The distribution of Ranunculus polyanthemos in the Scandinavian North. O: uncertain occurrences. rences. It agrees well with the occurrence of the species in north-eastern L'inland; Erom a rich distribution in large parts of South Einland (»In Eennia austraU et media plerumque satis frequenter», Hjelt) it stretches eastwards, with isolated occurrences high up in the north; it reaches the Kola Peninsula, and further east it is found on the River Pinega inside the Kania Peninsula (Pohle 1913). The localities consist of southerly hill slopes with calcareous soil. We have here an example of the not uncommon circumstance that species which are southern in the western parts of the Scandinavian North have a nor- thern limit that rises strongly towards the east. This has recently been pointed out by Samuelsson concerning several hydrophytes that are southerly in Sweden and looked upon as comparatively heat-loving and exacting as regards nutrition (Sa- muelsson 1920, p. 37). Samuelsson considers that the explanation should be sought in the wide distribution of lakes rich in nutrition in the said districts. Attention must also be paid, however, to the temperature conditions, especially concerning Ranunculus polyanthemos. The distribution of the species in question towards the north in Einland and Russia is due, of course, to the occurrence of calcareous soils and »Eutrophian Lake types» in these districts, for the species are in their whole distribution tied to soil or water that is comparatively rich in nutrition. Hut the rise of the northern limit. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectplants, bookyear1922
