[split] Voynich-like plants in Firenze Riccardiana Ricc. 2174

[Koen G]

That's why I am convinced that at least some plants are composites.

Quite possibly, though I would add the disclaimer that this doesn't need to be as esoteric as it may sound. 
Here's an example of literal Fleur de Lys on what appears to be an onion:

   

The inscription reads hermodattilo. This could be the "ermodaktylon" of the Byzantine tradition, which is You are not allowed to view links. Register or Login to view.. A plant that resembles crocus somewhat, but isn't. Nowadays, Hermodactilus is a kind of Iris though: You are not allowed to view links. Register or Login to view.

The second inscription reads Cipolla marina - sea onion? 

Anyway, my point is that this drawing is a composite between an allium and a fleur de lys.