Possibly the definitive beginners guide to plant medicine. I picked it up because I'm a fantasy writer who is sick and tired of having to stop my writing to google medicinal herbs every time one of my characters gets sick or injured.
For my purposes, I couldn't have asked for a better source. In addition to a compendium of 550 herbs, their medicinal uses, their place in folklore, chemical properties, preferred environments, where to find them, and lots of color photographs, the book also contains an overview of the histories of plant medicine in various cultures, step by step guides on how to make infusions, decoctions, poultices, ointments, etc., and advice on harvesting, cultivating, and processing plants. I focused mainly on the North American herbs, and I can't wait to beat the crap out of my fantasy characters so I can heal them with my new knowledge of herblore.
Beyond that, I would caution readers without medical backgrounds against using this book as a DIY guide to making medicine. While many of Chevallier's claims about the effects of plants on the body seem convincing, a number of others struck me as scientifically specious -- For example, that certain herbs can detoxify the body, allowing your organs to "invest greater resources in repairing and strengthening damaged tissue and weakened organs" (12). It's my understanding that medical professionals have roundly criticized alternative medicine's claims that it can "detoxify" the body. Many of the herbs that I read about are described as diuretics, which makes me wonder if the plants themselves contain toxins that the body is trying to expel. And should we really be taking hemlock as medicine? What do you think, Socrates?
Adding to the confusion, the book sometimes uses vague and nonpharmaceutical language. One herb promises that it "stimulates the uterus" (50). Um. What??!
To his credit, Chevalier is careful to warn about plants' toxicity, allergens, which ones shouldn't be taken during pregnancy, and which should only be taken under professional supervision. And I can certainly understand why some readers would turn to medicines that can be grown cheaply at home. Healthcare should be free, and modern medicine needs to do a MUCH better job at meeting the needs of women and other marginalized groups.
For my part, I won't be rolling the dice with any of these herbs, accept for the ones I already know to be edible. You can stuff me full of barley and basil, but let Socrates keep his hemlock.