Madagascar Periwinkle or Vinca (<i>Catharanthus roseus</i>) from William Curtis' <i>Botanical Magazine</i>, ca. 1787-1807. Image from the <a rel="nofollow" class="external text" href="https://www.nal.usda.gov/curtis/248jpg.shtml">National Agricultural Library, ARS, USDA</a>
<a href="//commons.wikimedia.org/wiki/Sydenham_Edwards" title="Sydenham Edwards">Sydenham Edwards</a>, Sansum
1793
<a href="//commons.wikimedia.org/wiki/Curtis%27s_Botanical_Magazine" title="Curtis's Botanical Magazine">Curtis's Botanical Magazine</a>, Volume 7 Plate No. 248  a digital scan of which can be found  <a rel="nofollow" class="external text" href="https://www.nal.usda.gov/curtis/248jpg.shtml">here</a>