For someone like me who lives in the country but is neither naturalistic nor a specialist in flora and fauna, this guide is very convenient. It is fairly easy to navigate. For example, the search for flowers is by color. At the index searchable by common name or scientific name. It is however not exhaustive (is it even possible ??) because I happened not to find a plant or flower cross around my house, but it is quite comprehensive. It's part in my basic books of a library just like a good dictionary.