No text, but a visual code

[-JKP-]

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  God has marked all the creation with signatures. The medicinal herbs are marked. Its shapes (roots, leaves, flowers) resemble human organs, parts of the body which are healed by them. Maybe something of this philosophy is reflected in the herbs of the Voynich and they are part of the alchemical tradition They look like fantastic herbs but they don't need an explanatory text, only to link them with its correspondent stars.

Yes, this is how many of them thought about plants. The shape of the plant was God's way of "signaling" what the plant could cure. And yes, the idea was so pervasive, I wouldn't be surprised if some of the VMS plants reflected this belief (either directly or by copying something from a tradition that included this belief).