The malaria parasite <i>Plasmodium</i> has an organelle called the apicoplast which is biologically very similar to the chloroplast of plants (and is believed to share an evolutionary history with it). So it makes sense biologically that an anti-malarial drug could also work against plants if the apicoplast is affected.<p><a href="https://en.wikipedia.org/wiki/Apicoplast" rel="nofollow">https://en.wikipedia.org/wiki/Apicoplast</a>