The Legume and Thistle Flora of Kumaun, Western Himalaya, India describes 522 species of four families i.e. Fabaceae, Caesalpiniaceae, Mimosaceae and Asteraceae. This group encompasses 177 genera of which 60 genera belong to Fabaceae, 8 genera to Caesalpiniaceae, 6 genera to Mimosaceae, and 103 genera to Asteraceae with these genera harbouring 206, 30, 21, and 265 species, respectively. The families and species are arranged in alphabetical order. The present flora will be of interest to researchers, naturalists, conservationists, trackers, botanists, nature lovers, students, teachers, traditional practitioners etc.