File:Galeopsis tetrahit august gothenburg sweden.jpg

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Description

This is the flower of a Common Hemp-Nettle. The scientific name of this plant is Galeopsis tetrahit.

It can be hard to distinguish Galeopsis tetrahit from Galeopsis bifida, which is a close relative. These two species also occasionally crosspollinate to create hybrids making the situation even more complex. When trying to determine if a particular specimen is Galeopsis tetrahit or Galeopsis bifida, one will usually look for three particular characteristics of the middle petal amongst the three lower ones, plus one other characteristic. The characteristics are:

  • The darker region does not extend all the way to the boundy of the petal middle lower petal.
  • The middle lower petal does not have a dent or a cleavage in it.
  • The middle lower petal is square-like.
  • The hairs on the upper half of the stamen got little glands at the top.

The particular specimen in this image exhibits all four of these typical characteristics of Galeopsis tetrahit (to bad the technical merits of the photo isn't as perfect).

English: Brittlestem hempnettle, Bristlestem hempnettle (or possibly Common Hemp-Nettle)
Deutsch: Gewöhnlicher Hohlzahn or Gemeiner Hohlzahn
Svenska: Pipdån (a long time ago it was also called Röddån)
Nederlands: Gewone hennepnetel
Norsk nynorsk: Kvassdå
Dansk: Almindelig Hanekro
Suomi: Karheapillike
Íslenska: Hjálmgras

An older but synonymuous scientific name is Galeopsis carthusianorum.

Camera: Nikon D50 with a 18-55mm lens

Location: In the parkish forest area behind the botanical garden of Gothenburg, Sweden.
Date
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Author Martin Olsson (mnemo on en/sv wikipedia and commons, martin@minimum.se).
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(Reusing this file)		 This image is published on Wikipedia Commons by Martin Olsson under the Creative Commons Attribution ShareAlike license versions 2.5, 2.0, 1.0 and also the GNU Free Documentation License (GFDL). For redistribution in non-Wikipedia contexts put my name as a byline in the image caption (i.e. Photo: Martin Olsson), for use within the Wikipedia project such a caption is appreciated but not necessary.

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This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic, 2.0 Generic and 1.0 Generic license.
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current20:42, 10 August 2006Thumbnail for version as of 20:42, 10 August 20061,542 × 819 (606 KB)Mnemo (talk | contribs){{Information| |Description=This is the flower of a ''Common Hemp-Nettle''. The scientific name of this plant is ''Galeopsis tetrahit''. <p>It can be hard to distinguish ''Galeopsis tetrahit'' from ''Galeopsis bifida'', which is a close relative. These

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