Abstract
Following ongoing ecological research on the tree diversity of the Indonesian island of Sulawesi, we describe five new species of Syzygium. These are the first descriptions of Syzygium species from the island since Blume (1850, Jambosa celebica and J. cornifolia), highlighting the significant lack of taxonomic research on the genus for the region. The five species proposed as new are Syzygium balgooyisp. nov., Syzygium contiguumsp. nov., Syzygium devogeliisp. nov., Syzygium eymaesp. nov., and Syzygium galanthumsp. nov. All species are illustrated and information on their distribution, ecology, and conservation status is given.