@ Doireannjane, thanks for the offer. I will need more time to go over the material you have already linked, so perhaps in a few days I will get back to you. The same for the information others kindly provided about the plants, since I don't want to rush things.
The question I had asked you was regarding that vertical column formatting, and it seems it is not anything unique to her books, though she may have used them uniquely for her purpose. I am seeing that they used the vertical column letters somewhat like a table of contents in medieval books, but need to study it more. See images below. If you have any further thoughts on that specific question, yes, I'd be interested to know, but no rush, but so far I am finding it is not anything unique to the book you had shown on that YouTube clip.
@ R. Sale, that is a good question, and I will try to provide some answer later. However, if your "Self-validations excepted" rule should apply, it should also apply to your post itself, no? You seem to be asking the question already assuming you are validated in what you think my answer would be! I did not even answer, and you assumed the answer is no! So, yes, that is part of the elephant too, or at least what does not help us seeing it, since we already think we know and are validated for it.