A flora to the fowering plants of Papuasia, which is a botanical region defined in the World Geographical Scheme for Recording Plant Distributions and encompasses Aru Islands and West Papua in eastern Indonesia, Papua New Guinea, and the Solomon Islands (excluding the Santa Cruz Islands). The book treats three Dicotyledon subclasses, namely Magnoliidae, Hamamelidae, and Caryophyllidae, which were originally published separately in three different parts.