<i><a href="//commons.wikimedia.org/wiki/Anthemis_arvensis" title="Anthemis arvensis">Anthemis arvensis</a></i>
<a href="https://en.wikipedia.org/wiki/Nathaniel_Lord_Britton" class="extiw" title="en:Nathaniel Lord Britton">Nathaniel Lord Britton</a> (1859-1934), and A. Brown
1913
<i>An illustrated flora of the northern United States, Canada and the British Possessions</i>. Courtesy of Kentucky Native Plant Society.