Product Description

A fascinating look into the history of plants in medicine, it also details the range of chemicals produced by medicinal plants and explores the prospects for future discoveries. Foreword by Mark J.Plotkin. With 30 b/w photos and 45 b/w drawings.

Product Details

• Amazon Sales Rank: #665716 in Books
• Published on: 2008-04-07
• Original language: English
• Number of items: 1
• Binding: Paperback
• 252 pages

From Booklist
The hidden chemistry of flora is revealed in this accessible introduction to the world of medicinal plants. Harvard botanist Sumner begins with an in-depth look at the folklore of herbalists in Europe preserved since the middle ages, and then discusses the discoveries of plant compounds such as alkaloids, which have been used for everything from easing people's pain (morphine) to driving them mad (ergotamine). Why plants produce these myriad compounds is still somewhat of a mystery, but Sumner explores such possibilities as defense strategies and chemical evolution. Some of her most interesting revelations are about the relationships that animals have with plants: their pharmacopoeia is much more advanced than we give them credit for. Sumner also provides a fair amount of information on what are now considered the most effective herbs for self-medication, and reminds readers that preserving biodiversity for the potential discoveries of yet more medicinal plants is a noble cause, even if it has a commercial bent to it, because plants literally contain the germ of continued life on this planet. David Siegfried
Copyright © American Library Association. All rights reserved

Review
"...The Natural History of Medicinal Plants will inspire a greater appreciation of the vast natural pharmacy of plant medicines." -- Biology Digest, December 2000

"If you are interested in medicinal plants, this will be a fascinating addition to your library." -- HomeGrown, November/December 2000

"One of the best histories available on the use of plants in medicine." -- Harvard Medical School Quarterly Review

"This is an easy to read book that will appeal to almost anyone interested in plants as medicine." -- Hawaiian Horticulture, Volume 3, Number 11, November 2000

From the Publisher
Although we may be tempted to think of these and other plant chemicals existing primarily for our medicinal use, in reality they are defense strategies in a natural world colonized by organisms competing for survival. In this fascinating introduction to the botanical compounds used medicinally, Dr. Sumner describes their biological and ecological importance as toxins and deterrents in protecting plants. An exciting chapter on the new field of zoopharmacognosy provides some interesting examples of birds, primates, and elephants that seemingly recognize and use plants as medicines. The author concludes with a thought-provoking analysis of the issues behind using medicinal plants to improve human needs without destroying the earth’s biodiversity.

Customer Reviews

I found a goldmine with this little book
Having an interest in the subject of medicinal plants, I have been looking for book that explained more about what compounds are in plants and how they affect not only people but nature as a whole. I was intrigued by the concept that plants produce these compounds as defense mechanisms for their own survival, and it is these same compounds that act as medicines (or poisons) when used by people. It also inadvertently explains plant companions for successful gardening. For instance, when Purple Sage leaves are crushed, they release a compound to nearby tomato plants to release their own insect inhibiting compounds. What a great book!

A fascinating & informative history of plant-based medicine
Before discoveries were made in the labs, plant medicines accounted for most of the substances used to cure disease. Natural History of Medicinal Plants provides a fascinating and informative science history of plant-base medicine, how people have learned the applications of such medicine, and why plants developed curative properties. Chapters will prove of use to both those involved in health professions and botanists alike.

Fascinating subjects covered but deceptive analysis within the parameters of a narrow perspective
The author delivers a readable account of the history of botany and modern ethnobotany in which a wide variety of fascinating subjects are discussed.

This book illustrates the drawbacks of a perspective that is too narrowly focused on microbiology and organic chemistry to reach explanations about medicines, cures, toxins, and plant evolution at the expense of more tenable, holistic perspectives that take phytochemical interactions into consideration.

Time and time again throughout this work it is apparent that plants and what the author defines as "plant medicines" (i.e. synthetic drugs derived from plants) are valued only to be analyized in the laboratory and broken down into their constituent compounds. Though praise for indigenous traditional knowledge of plants is found throughout the book, it appears to be shallow lip service for in the last few pages the author states, "Some firmly believe that traditional healers know more than oncologists and cardiologists and shamanic huts surpass hospital wards." The context makes it clear that the Harvard professor disdains those who would opt for the "shamaic huts."

In several instances the author selectively mentions the drawbacks of using herbs and whole plant medicines (e.g. variable potency and toxicity) without bothering to point out that use of highly concentrated synthetic drugs carry unique risks and dangers not usually encountered with the use of "crude" plant medicines. Indeed, the process of identifying useful plants, finding active compounds and synthesizing these compounds seems to almost be taken for granted by the author as the only intelligent way plants can be used as medicines. At times the authors' failure to present an honest comparison of the drawbacks as well as the strengths of modern medicine and herbalism borders on hypocricy. At the very least a double standard is used as the author uses scare tactics and low brow innuendo to inflate and sensationalize the dangers of herbalism while failing to note any inherent risks in modern medicine or drugs. For instance, the author selectively cites only a few of the most dangerous herbs to imply that they are all dangerous or require regulation. In the exact same vein, the author refers to herbalists from the past as "quacks" and "charlantans" failing to note the obvious fact that the state of medical knowlege in the 21st century is slightly more advanced in some ways than it was two hundred or more years ago. Collectively speaking, this line of reasoning follows of trend of many modern scientists who believe that the assembly-line corporate "health care systems" we have today are far superior to any form of medicine that involved interaction between human beings as opposed to pronouncing a person's state of health based on a single lab test.

The author presents a weak thesis that "secondary compounds" found in wild plants are poisons whose purpose is to discourage herbivores. If that was the case then why have so many plants developed mechanisms to attract herbivores to feed on them? In many cases, such as with many types of flowers, the plant cannot reproduce without the aid of herbivores to assist with the vital processes of seed pollination and dispersal. This thesis begins to look even more ragged as the author considers the example of THC as a "toxin" that decreases an herbivore's chance of survival when in fact many types of naturally occuring hallucinogenic compounds have been shown to actually increase sensory perception and visual acuity in mammals, making their survival against predators more likely rather than less. The author appears to prefer the view that plants and animals are engaged in mutual, interneccine combat rather than sets of complex and often symbiotic relationships. This follows the pattern of the author's fixation upon toxins and "secondary compounds."

The author goes on to exaggerate the risks of poisoning by herbs contaning pyrrolizidine alkaloids, conveniently ignoring the fact that research on the subject is inconclusive. The author worries about the fact that the effective dose and toxicity is likely to vary from plant to plant without mentioning the fact that many common, very widely used over the counter drugs like aspirin can be toxic and even fatal in relatively small doses. Nor does she note that many powerful drugs have an effective dose that is quite close to toxic dose (low LD50). In one instance, the author claims that THC is some sort of plant toxin defense mechanism against herbavores in the hemp plant. This is clearly absurd since THC is typically present in hemp in concentrations of 3% or less and since extremely high doses of it are necessary to be toxic to animals. Furthermore, THC causes an increase in appetite, so why would that discourage animals from eating plants that contain it? This example causes me to doubt that this author understands what a toxin is. Either that or the author is using an extremely selective and highly misleading definition of toxicity in order to frighten and confuse the readers about the nature of herbs, herbalism and plants.


Never the less Sumner does an excellent job of presenting the case for ecosystem preservation, the legal aspects of creating and finding new drugs. The author also outlines contoversies surrounding the exploitation of indigenous healers and describes ways to remedy these situations that can provide equitable soluions for local people as well as drug researchers. Additionally, Sumner provides interesting discussion about seed banks and their role in preservation and research and the history of herbarium collections. The authors' well stated explanation of the importance of maintaining genetic diversity in plants will enlighten readers.

Unfortunately readers will need to be skeptical at all times as this author has a strong bias against herbalism and traditional folk healing. This book could be a case study of how "science" is invoked to establish intellectual authority, yet exaggerated claims are made and poorly argued, psuedo reasoning, scare tactics, innuendo and name calling are substituted for established facts, thorough research and honest treatment of opposing points of view.

Readers need to be wary of people who say they have "science" on their side. That isn't a real argument. Research results and statistics don't "lie" but they are often inconclusive and easily manipulated. Citing research is not enough to establish truth. The relevence of the research and its limitations need to be presented. All the evidence for and against something should be presented.