Maybe it is simply a book of plants and their medicinal/culinary uses?
I have a number of books on the subject of herbs, their medicinal and culinary uses and the benefits thereof-they are written in English, but the illustrations in several of them look very similar, and have the Latin name of the plant below the picture.
Or, to quote a Star Trek TNG episode about breaking a code-it could just be someone’s recipe for biscuits...
That was the view taken a few months back, in the previous topic about it.