I'd also recommend Nicholas Culpeper's
The Complete Herbal (also known as
The English Physician) from 1652, which does a good job of collecting various folk beliefs as well as practical remedies. Here's a typical entry:
ALKANET
Names. Besides the common name, it is called orchanet, and Spanish bugloss, and by apothecaries, enchusa.
Description. Of the many sorts of this herb, there is but one known to grow commonly in this nation; of which one take this description; it hath a great and thick root, of a reddish colour, long, narrow, hairy leaves, green like the leaves of bugloss, which lie very thick upon the ground; the stalks rise up compassed round about, thick with leaves, which are lesser and narrower than the former; they are tender, and slender, the flowers are hollow, small, and of a reddish colour.
Place. It grows in Kent near Rochester, and in many places in the West Country, both in Devonshire and Cornwall.
Time. They flower in July, in the beginning of August, and the seed is ripe soon after, but the root is in its prime, as carrots and parsnips are, before the herb runs up to stalk.
Government and virtues. It is an herb under the dominion of Venus, and indeed one of her darlings, though somewhat hard to come by. It helps old ulcers, hot inflammations, burnings by common fire and St. Anthony's fire, by antipathy to Mars; for these uses, your best way is to make it into an ointment; also, if you make a vinegar of it, as you make vinegar of roses, it helps the morphew and leprosy; if you apply the herb to the privities, it draws forth the dead child. It helps the yellow jaundice, spleen, and gravel in the kidneys. Dioscorides saith, it helps such as are bitten by a venomous beast, whether it be taken inwardly, or applied to the wound; nay, he saith further, if any one that hath newly eaten it, doth but spit into the mouth of a serpent, the serpent instantly dies. It stays the flux of the belly, kills worms, helps the fits of the mother. Its decoction made in wine, and drank, strengthens the back, and easeth the pains thereof: It helps bruises and falls, and is as gallant a remedy to drive out the small pox and measles as any is; an ointment made of it, is excellent for green wounds, pricks or thrusts.
The book was revised repeatedly over the following centuries, and it's often hard to say when any given edition might have been written. It's available on Project Gutenberg as well as piecewise at
http://www.complete-herbal.com/completeherbal1814.htm .