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Blackstonia perfoliata ssp. perfoliata; Yellow-wort   

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Blackstonia perfoliata ssp. perfoliata
Blackstonia perfoliata ssp. perfoliata
Photographer: Dr. Amadej Trnkoczy

ID: 0000 0000 1121 2139 (2021-11-30)

Copyright © 2021 Dr. Amadej Trnkoczy

  • date of photo  May 16, 2007
  • latitude 44.37980   longitude 14.79710     View on Google Maps.
  • location   Adriatic Sea, island Olib, east shore of the island, near the harbor St. Roko (Zadar region, Croatia)
  • family Gentianaceae
  • notes   Slo.: preraslolistna grenčica - Habitat: Garrigue, abandoned fields, old, mostly abandoned olive groves, road sides and semiruderal ground; flat terrain, calcareous ground, open, sunny, dry places; elevation from 3 m; average precipitations ~ 1.000 mm/year, average temperature 13-15 deg C, Sub-Mediterranean phytogeographical region. Substratum: red karst soil. Comment (pertains to pictures in the Flickr album Blackstonia-perfoliata-subsp-perfoliata): Blackstonia-perfoliata-subsp-perfoliata is a small but interesting plant of Mediterranean region. However, it spreads also in Central European countries as well as in UK. In Slovenia one can find it almost exclusively in its warmest parts near the Adriatic coast. The plant has interesting leaves. Two opposite, grayish- or bluish-green upper stem leaves are completely fused together at the base, so it appears the stalk is growing through a single leaf. Blackstonia-perfoliata-subsp-perfoliata's sister taxon Blackstonia perfoliata ssp. serotina is very similar but their upper stem leaves are much less distinctively fused together and also have three (albeit often hardly to see) leaf veins instead of a single, central one as with Blackstonia-perfoliata-subsp-perfoliata. The name given to the taxon is after English pharmacist and botanist John Blackstone who lived in 18. century. Ref.: (1) A. Martinči et all., Mala Flora Slovenije (Flora of Slovenia - Key) (in Slovenian), Tehnična Založba Slovenije (2007), p 505. (2) M. Blamey, C. Grey-Wilson, Wild Flowers of the Mediterranean, A & C Black, London (2005), p 175. (3) I. Schӧnfelder, P. Schӧnfelder, Kosmos Atlas Mittelmeer- und Kanarenflora, Kosmos, (2002), p 63. (4) N. Jogan (ed.), Gradivo za Atlas flore Slovenije (Materials for the Atlas of Flora of Slovenia), CKSF (2001), p 152.
  • camera   Nikon D700 /Nikkor Micro 105mm/f2.8
  • contributor's ID #  Bot_0187/2007_DSC7633
  • photo category: Plant - annual/perennial

  • common names   Yellow-wort (photographer)
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    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 © 2021 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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