Wild crop relatives, more commonly and accurately known as crop wild relatives, are valuable genetic resources that may possess genes useful for crop improvement now and in our future responses to climate change. Many authors have contributed to this book's 15 chapters, each of which focuses upon a legume or forage crop and associated species. All but one are legumes (no grasses), but with Chenopodium as the odd one out. The chapters differ in their content, but generally include aspects of taxonomy, the different genepools associated with the crops (primary, secondary etc.), genetic diversity, genomic resources and, in some cases, conservation both in situ and ex situ. In some of the chapters information on evaluation is available, including, for instance, sources of disease resistance. Possibilities for wide hybridisation, and traditional and advanced tools for crop improvement are also discussed in places. The book is likely to be a useful resource for a range of scientists, although given the price this might be limited. If plant breeders are involved in breeding a range of forage legumes, then reference to this book might be useful. What is less obvious, and despite there being relatively little included on conservation, is that those involved in the conservation of plant genetic resources might be the real users of this book; they will find information that will allow them to prioritise their conservation activities, and determine the species on which most conservation effort can be focussed.