This book was not what I expected. It is not so much a field guide as it is fireside reading for someone interested in ecology of wetlands. Each plant (from trees to forbs to grasses to algae) are described along with the animals and insects you are likely find associated with it. A section called Lore provides some interesting non-ecological tidbits about the plant.
There are two problems with this book. The first is that the line drawings are mostly poor quality. They would not be adequate to identify the plant in the wild, in most cases. However, they do serve to give a feeling of what the plant "sort of" looks like while reading the text. The other, much graver sin, is that the plants are listed alphabetically by common name and there is no index of scientific names (there is no index, period, and the table of contents lists just the common names). As anyone who has tried to identify plants very much will attest: common names vary - a lot. So as a field guide it is pretty much useless. But as an interesting read on the ecology of a few wetland plants (about 80 or so in total) it is a an inexpensive read.