A conceptual internal plant match?

[Koen G]

Apparently only Henry's elephant was the source of life-like illustrations. 

A lot of the good images do appear to be British, early 14th century. 
I also noticed that "elephant in water" after the bestiary story is really a thing. Here's one with its young and the dragon:


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This one is early 13th century Austria. The elephant's anatomy is lacking, but we have all the ingredients there:

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This one is ca. 1290, Italian:

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This one is from the 9th (!) century France. The description says the flow is one of the rivers of paradise, which is reminiscent of the way various blue streams depart from under the VM elephant head.

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2nd half 15th century Austrian, perpetuates the wisdom of the bestiaries: 

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DUM COIT HIC ELEPHAS CONFESTIM CURRIT AD UNDAS
“When the elephant mates, it immediately runs to the waters.”