Rene
Thank you for your comments. I have come to understand that such proposals are seen as rather silly free association, so I appreciate it.
To explain what I'm seeing in the root section as a whole, I need at least three historical stages:
1) Hellenistic origin
2) "in between adaptation"
3) More or less faithful copy of the documents once they reached Europe.
Many plants I have identified so far have their primary use outside of the field of medicine, like teak for timber and other plants for making ropes. Some, like sugar and saffron, did of course have a large medicinal significance as well. The point is, that I think the root section was originally meant as a naval trade-related document rather than a medicine-related one.
In this sense, supposing the first Hellenistic stratum, towers and lighthouses, i.e. the first buildings one sees when approaching a harbor, would have been very relevant. To say which exact tower or lighthouse they would have represented, is almost impossible. The Pharos was imitated by other structures and many of these early lighthouses are now lost and/or poorly documented.
I agree that what we see now are not towers, especially since many of them have been given a foot or some kind of pedestal. But if you look at You are not allowed to view links.
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Login to view. for example, and remove the bottom part, what you have left appears to be a tower top. Same is true for You are not allowed to view links.
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Login to view., and so on. Especially the simpler "stacked cylinder" type can be seen as fully representing a tower, only having its top opened up to turn it into a vessel.
So my hypothesis would be that this section was first a collection of plants valued in trade, along with separate images from classical mythology as mnemonics, giving a
superficial resemblance to what we see now in some pages of the Lombardy herbal: plant with similarly sounding "other thing". Images of recognizable architecture from various ports wouldn't have been out of place either, as well as, perhaps, images of containers.
In the in-between stage, however, someone got rather creative and mixed the plant images with the mnemonic images. Similarly, the architectural drawings got merged with vessel drawings.Why this was done, I don't know. Creating slightly absurd images does help the memory, cfr. "modern" techniques like the memory palace, which have their roots in antiquity and started to decline after inventions like the printing press made memorization gradually less important.
I don't know by whom and where this hypothetical in between stage was performed. I am happy though, that there is at least a partial parallel in other traditions, of merging a plant and an associated image (like "palma christi" and all those).
What I am doing now is trying to uncover the ground layer, which I think was culturally Hellenistic (which may have been well after the first century CE in some areas). In that way, from my perspective, noting architectural elements from the time in those containers may be relevant - much more so than a cannon
But I realize that as long as I stay within this hypothesized first stratum, it will appear as free association to others, and may well be not much different from it.