<i>Arnica montana</i>, illustration without captions.
<bdi><a href="https://en.wikipedia.org/wiki/en:Walther_Otto_M%C3%BCller" class="extiw" title="w:en:Walther Otto Müller"><span title="German botanist (1833-1887)">Walther Otto Müller</span></a>
</bdi>
1897
<a rel="nofollow" class="external text" href="http://pharm1.pharmazie.uni-greifswald.de/allgemei/koehler/koeh-eng.htm">List of Koehler Images</a> <a rel="nofollow" class="external text" href="https://archive.org/details/mobot31753002839121">The Internet Archive</a>