The published work submitted for consideration for the degree of Ph.D. (by Research Publication) consists of two parts of the Flora of Bhutan, describing the monocotyledons (some 942 species) with the exception of Orchidaceae. Together with these are ten precursor papers relating to these parts of the Flora: the papers include descriptions of new species, nomenclatural discussion (including typifications) and phytogeographic information. The critical review gives the historical background for the whole Flora project, together with the methods used in my own contribution and some of my more interesting findings. An enumeration of new taxa described, and new combinations made, is given in an appendix.