Notes on the genus Syzygium (Myrtaceae) from Cambodia, Thailand, Vietnam, China and Taiwan Author Chantaranothai, Pranom 0000-0002-5065-6169 Applied Taxonomic Research Center (ATRC) and Centre of Excellence on Biodiversity (BDC), Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand & Royal Botanic Gardens, Kew, Richmond, Surrey TW 9 3 AE, UK text PhytoKeys 2024 2024-07-11 244 151 161 journal article 299706 10.3897/phytokeys.244.118657 0dde5265-4a83-4864-a6a9-471b7640af21 Syzygium thorelii (Gagnep.) Merr. & L. M. Perry , J. Arnold Arbor. 19: 107. 1938 . Eugenia thorelii Gagnep. in Lecomte., Notul. Syst. (Paris) 3: 333. 1918 . Type. Thailand , Ubon Ratchathani , Kemmarat , Thorel 3010 ( lectotype , designated by Soh and Parnell 2015 , p. 261: P [ P 00589178 ]; isolectotypes : A [ A 00069448 ], P [P 00589179 ], K [ K 000276196 ]) . Distribution. Thailand , Laos , Cambodia , Vietnam , China ( Yunnan Province , Mengla County, Mt. Gongbeng, Luosuo River Estuary, 500 m alt., 3 Jan. 2011 , Li-Jianwu 239 (HITBG, no. 135842, QBG). Ecology. Open rock crevices in the Mekong River, partly submerged at high water or in sandy soils along the side of the river. Notes. Syzygium thorelii is distinctive in having an obtuse or acute leaf apex and alternate leaves in the lower parts of the plant. A previously unidentified specimen seen at QBG undoubtedly belongs to S. thorelii and is a new record for China . The Chinese specimen extends the range of the species from Thailand , Laos , Cambodia and Vietnam to Yunnan.