This volume comprises the results obtained from the Third Botanical Expedition to Eastern Himalaya (Bhutan, Nepal) in 1967 and the Fourth Expedition (Nepal, Sikkim) in 1969 organized by the University of Tokyo. It also includes supplementary remarks to an earlier volume of "The Flora of Eastern Himalaya" published by the university in 1966 and which was based on the data from the botanical expeditions by the University of Tokyo between 1960 and 1964.