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Myriophyllum alterniflorum; Alternate Water-milfoil   

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Myriophyllum alterniflorum
Myriophyllum alterniflorum
Alternate Water-milfoil
Photographer: Dr. Amadej Trnkoczy

ID: 0000 0000 0622 0105 (2022-06-05)

Copyright © 2022 Dr. Amadej Trnkoczy

  • date of photo  May 24, 2022
  • latitude 44.81469   longitude 14.39921     View on Google Maps.
  • location   Adriatic Sea, island Cres; south of settlement Grmov, Kvarner archipelago (Rijeka region, Croatia)
  • notes   Slo.: no name, CR: izmjeničnocvjetni krocanj - Habitat: shallow pond about 0.5 m deep, with Eleocharis palustris and Ranunculus peltatus; sheep watering hole in garrigue; open, sunny, dry, place; stony, calcareous ground; elevation 195 m (640 feet); average precipitations ~ 1.000 mm/year, average temperature 13-15 deg C, Sub-Mediterranean phytogeographical region. - Substratum: muddy soil at the bottom of the pond. - Comment (pertains to Flickr album Myriophyllum alterniflorum): In spite of hot summers and generally dry climate of island Cres and extremely stony and calcareous, highly water permeable ground, there exist some rare spots with shallow ponds. They serve mostly as watering holes for sheep and other animals. These places are frequently full of interesting plants including some of them, which stay completely submerged during all of their lifespan. - There are four species of the genus Myriophyllum, which have been found so far on Adriatic islands according to Ref. 4. All of them are submerged in water and have deeply pinnately divided leaves. Two of them, namely Myriophyllum heterophyllum Michx. and Myriophyllum spicatum L. are quite different from this find. But, Myriophyllum verticillatum L. is similar to Myriophyllum alterniflorum. Since the plants found did not yet flower when photographed, it was quite challenging to determine them to species level. The decisive trait, which led me to the decision for Myriophyllum alterniflorum is the arrangement of thir thin segments of pectinate leaves (pinnately divided into fine, +/- parallel segments, comb-like). These segments are (mostly) alternate with Myriophyllum alterniflorum and oppositely arranged with Myriophyllum verticillatum. As it can be seen from Fig. 5. the leaves better correspond to Myriophyllum alterniflorum. - Ref.: (1) K. Lauber and G. Wagner, Flora Helvetica, 5. Auflage, Haupt (2012), p 200. (2) W.K. Rottensteiner, Exkursionsflora für Istrien, Verlag des Naturwissenschaftlichen Vereins Kärten (2014), p 523. (3) E.J. Jäger, Rothmaler 3, Exkursionsflora von Deutschland, 11. Aufl., Elsevier, Spectrum (2007), p 354. (4) Flora Croatica Database (FCD), Department of Botany, Faculty of science, FER-ZPR, University of Zagreb (2004); (accessed 5.6.2022)
  • camera   Sony ILCE6000 / Carl Zeiss Vario-Tessar E 16-70 mm/f4
  • contributor's ID #  Bot_1470/2022_ DSC00077
  • photo category: Plant - annual/perennial

  • common names   Alternate Water-milfoil, Alternateflower Watermilfoil (photographer)
  • View all photos in CalPhotos of Myriophyllum alterniflorum
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  • The photographer's identification Myriophyllum alterniflorum 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 © 2022 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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