Five new species of Syzygium (Myrtaceae) from Indochina and Thailand

Five new species of Syzygium (Myrtaceae), S. honbaense, S. phamhoangii and S. yersinii from Khanh Hoa Province, Vietnam, S. phoukhaokhouayense from Phou Khao Khouay National Protected Area, Vientiane Province, Laos, and S. scabrum from Bung Khla, Phu Wua Wildlife Sanctuary, Buengkan Province, Thailand, are described and illustrated. Photographs, vernacular names and preliminary conservation assessments are provided for them.