Good German book for the identification of Grassland grasses. Mostly directed towards farmers, but also useful for other people, e.g. in ecology, wildlife management or conservation biology. Contains descriptions for grasses in florescence and without flowering, which is a big plus. On the other hand it doesn't contain all the grasses of other habitats and doesn't contain cyperaceae at all. If you are looking for a basic identification code for poaceae though, this should be your choice.