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Espoo, Finland

Haeggstrom C.-A.,University of Helsinki | Haeggstrom E.,Tornfalksvagen 2 26
Memoranda Societatis pro Fauna et Flora Fennica | Year: 2015

The Åland Islands in SW Finland are known for their luxuriant vegetation with numerous calciphilic vascular plants. Ruderal plants are rather few compared to the adjoining regions of Finland and Sweden. However, new ruderal plants are occasionally found in Åland. We came across a ruderal site in the centre of the village of Godby, municipality of Finström, in 2002. Most of the organic topsoil had been removed and several rare ruderal species grew then on the open ruderal site. The site became more closed, resembling a meadow rather than a ruderal ground already in 2006 and later the vegetation developed into a tall and rough grown meadow with some shrubs and young trees. The following ruderal plants are treated more in detail: Agrostemma githago, Anthemis tinctoria, Centaurea cyanus, Cichorium intybus, Dianthus deltoides (cultivar), Echium vulgare, Holcus lanatus, Leontodon hispidus, Lotus corniculatus var. sativus, Papaver dubium subsp. dubium, P. rhoeas, Phleum phleoides, Rumex thyrsiflorus, Senecio jacobaea, Thymus pulegioides, Trifolium dubium and Vicia tenuifolia. Besides some trees and shrubs, 133 vascular plant taxa, most of them common in the Åland Islands, were observed growing in the ruderal site during the period 2002-2015. The origin of the ruderal flora is not known. It is suggested that at least some of the plants have originated from seeds in the former cultivated field. A deliberate sowing of flower seeds of foreign provenance cannot, however, be excluded, although we have not been able to prove it. Source


Haeggstrom C.-A.,University of Helsinki | Carlsson R.,Hogbackagatan 10 | Haeggstrom E.,Tornfalksvagen 2 26 | Sundberg K.,Sodravagen 491
Memoranda Societatis pro Fauna et Flora Fennica | Year: 2013

Epilobium hirsutum L. is an introduced species in Finland with the first reliable findings made in the late 19th century. The number of new findings accumulated slowly during the period 1900-1929. From the 1930's onwards, the number of findings grew rapidly and E. hirsutum has been found in 153 grid squares of 10 km × 10 km size in the southern part of Finland until 2012. The first information of the species in the Åland Islands is a note in the literature from 1821 and the first collected specimen in the Åland Islands is from the municipality of Sund in 1873. However, both these are doubtful as they were not noticed in Finnish vascular plant floras later on. The first reliable finding is from 1973 and thereafter the localities with E. hirsutum increased with four more during the 1970's, eight new during the 1980's, fourteen new during the 1990's and 35 new localities during the period 2000-2013. It thrives chiefly in man-made habitats in the cultural landscape and the most common habitats in the Åland Islands seem to be roadsides and road ditches. Although E. hirsutum has expanded during the last fifty years in Åland, it is not common yet and it has not been found in most of the eastern archipelago area. As an immigrant in our flora, E. hirsutum is now well established in the Åland Islands and it will probably be more common in the future. However, it seems that it is not a harmful invasive weed in Åland. Source


Haeggstrom C.-A.,University of Helsinki | Haeggstrom E.,Tornfalksvagen 2 26
Memoranda Societatis pro Fauna et Flora Fennica | Year: 2015

Echium vulgare L., chiefly a weed in the Nordic countries, was previously rather rare in the south part of mainland Finland and very rare in the Åland Islands. It has suddenly became much more common during the last twenty years. E. vulgare has been found in all municipalities of the Åland Islands, except Brändö. The reason for the rapid expansion of the species is partly road construction with possible introduction with grass seed mixtures sown on the newly constructed road slopes and verges, and partly deliberate sowing of E. vulgare along roads in the municipality of Lemland and perhaps elsewhere. A few cases of the species sudden appearance are described. Source


Haeggstrom C.-A.,University of Helsinki | Carlsson R.,Hogbackagatan 10 | Haeggstrom E.,Tornfalksvagen 2 26
Memoranda Societatis pro Fauna et Flora Fennica | Year: 2012

Three species of the genus Aira, viz. A. praecox, A. caryophyllea and A. elegantissima, have been found in Finland. The geographical range of each species is outlined. Whereas A. praecox has been known since 1912 in the Åland Islands, A. caryophyllea was found as a new species for Finland on the mainland of Kumlinge, Åland Islands, in 2008. A. elegantissima has been found as an introduced plant (weed or sown as an ornamental grass) in five localities in different parts of southern Finland between 1868 and 1985. All seven known localities with their separate stands of A. praecox were studied in detail in the Åland Islands in 2009. Of these localities, one was found in 2005 and two in 2009. The accompanying vascular plants were noted and their calcium dependence was assessed according to previous studies. The accompanying species comprised 113 field layer taxa, most of them common in the Åland Islands. The majority of the accompanying taxa belong to the calcium-neutral group. However, 27 calciphilic species were found, about 24 % of all the accompanying taxa. The amount of calciphilic species was compared to previous studies in Åland. Soil samples, chiefly fine sand, from all but one of the seven localities were analysed for pH, exchangeable Ca++, Mg++, K+ and PO4-. Further, NO3- and NH4+ were determined and soluble nitrogen was calculated from values on NO3- and NH4+. The pH values of the soil samples were mostly rather low for the Åland Islands. The concentrations of exchangeable Ca2+, K+, Mg2+, PO4- and soluble N were also mostly rather low. A. praecox often grows by bathing beaches, and thus a possible way of dispersal is by bathers and campers, e.g. with blankets. The locality in Kumlinge seems to be on ballast brought ashore from a sailing ship long ago. Although A. praecox has disappeared in some stands in localities 1 and 2 in Eckerö, much larger stands and three additional localities are known today. However, A. caryophyllea may be endangered, as it is hitherto known in one locality only and the number of specimens was about 50 in 2009. Source


Stjernberg T.,University of Helsinki | Carlsson R.,Hogbackagatan 10 | Hasggstrom C.-A.,University of Helsinki | Hasggstrom E.,Tornfalksvagen 2 26 | Sundberg K.,Sodravagen 491
Memoranda Societatis pro Fauna et Flora Fennica | Year: 2010

The Arctic Bramble, Rubus arcticus L., was found in Gottby in the municipality of Jornala, the Aland Islands, SW Finland, in June 2009. It was both flowering and fruiting, although rather sparingly. This boreal species has not been observed in the Aland Islands since 1950. The total distribution of the species is outlined. An account is given of the previous six observations of R. arcticus in Aland. The dispersal of the seeds (endocarps with seeds) of R. arcticus is treated. Source

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