Endangered taxa are species whose conservation in the environment has been threatened. An exhaustive bibliographic survey of endangered taxa in the region of Catalonia has been conducted, for the time period (2010–2019). A database has been created in Excel format in order to present and review the results. Greater knowledge of the taxa enables a better classification of the risk, allowing for the adequate prioritization of conservation actions. The most important threads, as shown by the information gathered, are the invasive non-native plants and those derived from human activity. Unfortunately, due to the lack of approved conservation plans, Natural Parks have been the ones left to develop monitoring programmes (SEFA).