In the wake of emerging realization about the importance of underutilized species, the account presented in this book will be useful in filling the gaps in research needs, in sorting out species of relatively more importance in Sri Lanka.This publication deals with 30 underutilized ornamental plant species, with floral and foliage value. Besides, this also lists species of commercial use that need further focus for research and development. In addition to geographical and ecological coverage, the compilation presents information on utilization of these relatively less utilized species, providing an analysis of their other values like nutritional, medicinal and or industrial while bringing beauty. The major emphasis has been laid on the effective and efficient utilization of these underutilized and less known species mainly grown by native communities, often in home gardens and marginal lands, distributed in forests towards floriculture industry. This well documented account will generate further interest on research and development of underutilized species for widening the ornamental plant selection and floriculture product assortment in the country.