The water apple is the least of the small group of somewhat similar fruits of the genus Syzygium (family Myrtaceae). This species, S. aqueum Alst. (syn. Eugenia aquea Burm. f.), also known as watery rose apple, is distinguished in Malaya as jambu chili, jambu ayer, jambu ayer mawar, or jambu penawar; in Indonesia as djamboo aer, djamboo wer, or djamboo wir. In the Philippines, it is called tambis; in Thailand, it is chom-phu-pa.