<a href="//commons.wikimedia.org/wiki/August_Wilhelm_Eichler" title="August Wilhelm Eichler">August Wilhelm Eichler</a>
Hunt Institute, Pittsburgh, and the Smithsonian Institution, Washington. Source:Swift, Lloyd H.:Botanical Classifications, Archon Books, 1974 - <a class="external free" href="https://en.wikipedia.org/wiki/Image:A._W._Eichler.jpg">http://en.wikipedia.org/wiki/Image:A._W._Eichler.jpg</a>