<i><a href="//commons.wikimedia.org/wiki/Viola_tricolor" title="Viola tricolor">Viola tricolor</a></i>. Model from the collection of the Botanical Museum in Greifswald, Germany. 
see also <a rel="nofollow" class="external text" href="http://www.universitaetssammlungen.de/modelle">universitaetssammlungen.de/modelle</a> for more information on the models.
David Ludwig
CC BY-SA 3.0
own work at Botanical Museum in Greifswald. OLYMPUS DIGITAL CAMERA.