Flora of Singapore volume 1 is the Introduction with chapters on the history of collecting and taxonomic research in Singapore, the relationships of the plants of Singapore to the wider region, the vegetation of Singapore and conservation in Singapore.
Flora of Singapore volume 7 contains the Poaceae with floristic accounts of the families Typhaceae, Syridaceae, Eriocaulaceae, Mayacaceae, Cyperaceae, Flagellariaceae and Poaceae.
This book, Flora of Singapore volume 13 contains the Gentianales with floristic accounts of the families Rubiaceae, Gentianaceae, Loganiaceae, Gelsemiaceae and Apocynaceae.