F17r plant: Alkanna Tinctoria?

[MarcoP]

In medieval illustrated herbals, it's often difficult to identify the exact subspecies intended. Dioscorides includes You are not allowed to view links. Register or Login to view.. According to You are not allowed to view links. Register or Login to view., the one on the left is is Alkanna Tinctoria. It should be noted that one of authors of the Purdue page is You are not allowed to view links. Register or Login to view., who identified Voynichese flora as American.