Plant of Folio 2v

[Linda]

Here is a map that shows the native range of Nymphoides (scroll down). It grows in many different climates all over the world (the green color is the native range):

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I believe the specimen of N. Indica  on that page shows that i was correct in thinking the items you characterized as leaf scars on the Nymphoides rhizome closeup were in fact root scars, there is a one point circular end in the photo which matches those in the closeup, which can be seen to be a cut off root.

The map shows why i am not familiar with these in real life, none occur where i live.

So, the hunt is still on for another horizontal rhizome similar to Nymphaea with flowers like some Nymphoides and or similar species, if you balk at the idea of a combo inclusive of many water lilies...or, it could be that a Nymphaea root was provided and drawn, and the rest came from the artist's own knowledge of or access to water lilies, and hence a hybrid was drawn.

Here are the types of water lilies that i see in my area, i realize the flowers do not match the vms drawing at all, however see the stolon cross section with the four holes, this matches many of the vms rhizome scars (some show only three dots).