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Sagina nodosa; Knotted Pearlwort   

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Sagina nodosa
Sagina nodosa
Knotted Pearlwort
Photographer: Dr. Amadej Trnkoczy

ID: 0000 0000 0214 0565 (2014-02-08)

Copyright © 2014 Dr. Amadej Trnkoczy

  • date of photo  Aug 18, 2011
  • latitude 46.31991   longitude 13.50629     View on Google Maps.
  • location   Bovec basin, right bank of river Soča near Podklopca place, between village Žaga and Bovec, East Julian Alps (Posočje, Slovenia)
  • family Caryophyllaceae
  • notes   Slo.: velecvetni pitomec - Habitat: river shore, abandoned gravel and sand excavation quarry, semiruderal calcareous ground, flat and lightly overgrown terrain, dominant plants: young Salix purpurea and Alnus incana, sunny place, exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 340 m (1.100 feet), alpine phytogeographical region. - Substratum: young alluvial gravel, pebbles, sand and silt. - Comment: Sagins nodosa, low, tiny, inconspicuous plant, blending well with others around, is hard to find and not really 'photogenic'. This eurosiberian boreo-temperate botanic element is at home in north Europe: like all over the Island, Scandinavia and Britain but also in north USA and Canada. It loves open space, moist, calcareous, sandy habitats in low land regions. In some places like in Britain it is in sharp decline after the mid of previous century. In Slovenia it was unknown until, in 1967, emeritus professor Dr. T. Wraber found an interesting Sagina, high in the Alps, on Mt. Čisti vrh, 1.875 m above Trenta valley, just a few km away of my home. The plant was later, based on herbarium specimen, determined as the first observation of Sagina nodosa in Slovenia. Yet, it hasn't been found again neither on Mt. Čisti vrh nor anywhere else for almost 50 years. - In August 2011 I accidentally encounter Dr. Nejc Jogan from Biotechnical Faculty, University of Ljubljana botanizing along the banks of river Soča near Bovec. Happy and excited he explained me that he had just found the second observation of Sagina nodosa in Slovenia. A few tiny plants were growing in the sand and silt of lightly overgrown river deposits some 10 m away of the river shore. Next day I spent up- and downstream of the original observation, trying to find more plants. Actually I found many of them on three other places in the vicinity. Just two weeks later, after the news spread among botanists, Dr. Igor Dakskobler found it also near town Tolmin some 30 kilometers south and downstream the river. As far as I know, his observation represents, at the moment, the most southern known location of this species in central and east Europe. All these observations, in very short time, are proving that this species is well settled in the region and that it's not such an extreme rarity in Slovenia as supposed before. It seems that the plant has been simply overlooked during more than 250 years of botany field research in Slovenia. Namely, it is unlikely that the plant settled in the upper Posočje just recently. Evident warming of the climate in Posočje during last decades would only push S. nodosa north, not south. - Ref.: (1) T. Wraber, Rastlinoslovne raziskave v Triglavskem narodnem parku (Floristic Research in Triglav National Park). V Bizjak, J. & M. Šolar (ur. /Eds.): Dvajset let pozneje: 1981-2001. 20 let zakona o Triglavskem narodnem parku (Twenty Years Later: 1981-2001, 20 Years of TNP Law), TNP (2001). 63-73, Triglavski narodni park, Bled. (2) (3) A. Martinči et all., Mala Flora Slovenije, Tehnična Založba Slovenije (1999), p 148.
  • camera   Canon G11, 6.1-30mm/f2.8-4.5
  • contributor's ID #  Bot_544/2011_IMG6428
  • photo category: Plant - annual/perennial

  • common names   Knotted Pearlwort (photographer)
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  • The photographer's identification Sagina nodosa has not been reviewed. Click here to review or comment on the identification.

    Using this photo   The thumbnail photo (128x192 pixels) on this page may be freely used for personal or academic purposes without prior permission under the Fair Use provisions of US copyright law as long as the photo is clearly credited with © 2014 Dr. Amadej Trnkoczy. For other uses, or if you have questions, contact Dr. Amadej Trnkoczy amadej.trnkoczy[AT] (Replace the [AT] with the @ symbol before sending an email.)


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