Here’s a link to an illustrated book on the Medicinal Use of Plants. Mind you, it’s 1000 years old. I thought it was interesting to see the pages even though it’s in old English and I don’t even begin to read that.
“The book, writes the British Library’s Alison Hudson, “is the only surviving illustrated Old English herbal, or book describing plants and their uses.” (The sole condition note: “leaves damaged by fire in 1731.”)”
Note it’s been digitalized.