“…An important step to achieve these goals is integrating new data more efficiently, starting with a phylogenetic framework. We propose the following criteria to guide the selection of plant groups in most urgent need of monographic study: (i) Major knowledge gaps: large groups that have not been monographed in the past c. 150 years (e.g., the genus Croton in Euphorbiaceae, with >1000 species xiv ) and include many species that cannot be evaluated for extinction risk due to taxonomic complexity limiting the allocation of species names; (ii) threatened: groups considered to be at high risk of extinction, or including both threatened and non-threatened species that are difficult to identify, are rare, or in urgent need of conservation assessment (e.g., the orchid family Orchidaceae, especially south-east Asian groups, such as Vanda [57]); (iii) valuable: groups that benefit ecosystems or humanity, identified by indicators such as a high proportion of crop wild relatives or rainforest tree species, as well as species of ecological, economic or cultural value, nitrogen fixation, carbon storage, or climate change resilience. For instance, a comprehensive monograph is needed for the legume tribe Phaseoleae, which includes the many crop wild relatives of cultivated beans (Phaseolus); (iv) morphologically or functionally unusual: groups that represent rare and extreme combinations of functional traits, at the fringes of the global spectrum of plant form and function [58], could illuminate potentially valuable adaptations to environmental change.…”