The Threatened Plants Project, organised by the Botanical Society of Britain and Ireland (BSBI), took place between 2008 and 2013 and is one of the most extensive sample-based surveys of threatened plants ever undertaken in the British Isles. Over 800 volunteers visited nearly 2000 sites, collecting ecological information for 50 threatened species, including the size, habitat, associated vegetation and management of each population, as well as any threats to the chosen speies on each site. This book presents the findings of the survey through individual species accounts, and examines why some species are more threatened than others by considering their characteristics, the extent to which changes in the wider environment have been offset by statutory designation, and the implications for their future conservation.