The approach also tends to give details on a few interesting / especially good flavored or nutricious plants and then gives a names-only grocery list of "Edible and medicinal plants" and then one of "For Observation only"
So, in summary, if you know a bit about general plant identification and your focus is on what's available for the season and habitat, this book is a valuable resource, but if you're looking for a field identification and classification tool, this is probably not the best choice.