What is special about Voynich plants?

[Bernd]

The amount and size of stem loops and fused plants is unique to the VM. This goes way beyond split or bored-through stems.
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I think it's plausible that the VM artist misinterpreted another drawing where stems crossed each other as a loop. Looking at a herbarium specimen, it would have been obvious that the stems never were physically connected. It should have been obvious that plants don't grow like this, but the VM artist drew the loops nonetheless, either accidentally or on purpose.