Most certain plant ID's?

[Koen G]

Centaurea is a good point, the genus can be bolded.

Regarding f21r, I see that there are several candidates. One of my goals for this thread was to find out which folios represent recognizable plants (which might perhaps reveal certain trends). And it is clear that You are not allowed to view links. Register or Login to view. draws the plant well, probably better than many other medieval illustrations of this plant type. The issue appears to be that there are a bunch of plants that look very similar... So what to do here?

Edit: I fixed it by adding an explanation.