This book presents a list of angiosperm taxa of different ranks recorded from or evidently available in Northeast India, which encompasses two global hotspots of biodiversity, viz., The Himalaya' and "Indo-Burma'. The predominantly mountainous region comprises about 8% of the total geographical area of the Republic of India, but astonishingly boasts more than one-half of the total diversity of flowering plants. For this volume, the region includes the geographies of Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Tripura, Sikkim and Darjeeling hills of West Bengal. The taxa are arranged according to the APG IV (2016) classification, which is an important divergence from the natural system of classification of Bentham and Hooker (1862-1883) followed everywhere in academia and herbaria to date. The nomenclature of taxa complies with the ICN's Shenzhen Code (2018) embodying results of the XIXth edition of the International Botanical Congress (2017), which has rendered more than one-third of plant names published in all regional floras archaic. The names, epithets and authorities are matched with the resources at Kew.