<i>Euphrasia ramosa pratensis flore albo</i> and <i>Euphrasia minus ramosa flore ex caeruleo purpurascente</i>.
<bdi><a href="https://en.wikipedia.org/wiki/en:Basilius_Besler" class="extiw" title="w:en:Basilius Besler"><span title="German botanist (1561-1629)">Basilius Besler</span></a>
</bdi>
Bessler, Basilius, Hortus Eystettensis, vol. 2: Ordo collectarum arborum et fruticum aestivalium, t. 150, fig. III (1620)