Uttar Pradesh, one of the largest states of India, has rich flora on account due to its varied topographic and climatic conditions. The comprehensive treatises, Flora of British India and Duthie’s “Flora of the Upper Gangetic Plain and of the adjacent Siwalik and Sub–Himalayan Tracts” published in 1903–1929 are still the main reference book even after more than hundred years of its publication. Albeit, it covers the many other parts of the current other states but is only left option for the taxonomist as an entire floristic account for the state. Due to exclusion of many areas from the current boundaries of Uttar Pradesh and change in the nomenclature of many present species worldwide compels the researchers to come up with the up–to–date floristic approach and make the successful publication of the holistic account for the state.