If it's a medicinal why the lack of accuracy?

[BessAgritianin]

  
 So why would there be fake flowers in there for a medicinal, in a mix among what looks like genuine plants? The telling feature I think is that well 
The fact that this flower is made up, could mean the text is made up.  

As Shakespeare says: Truth is usually simple" 
The You are not allowed to view links. Register or Login to view. flower which you discuss is some beans from pea family- a climber with a lot of shoots on its main stem and flowers on them. Some of the flowers are blooming , others are not yet open. 
The snakes - I suppose show that it had been used against their poison.
The text is not made up, but very useful and explaiining the medicinal uses of the herbs. It may have secret meanings - especially with roots representation, but I do not know  either.