Three genera, Aetheolirion Forman, Spatholirion Ridl. and Streptolirion Edgew. with four species, are recognised in Commelinaceae, tribe Streptolirieae for Thailand. Aetheolirion stenolobium Forman is an endemic species to Thailand. Distribution maps, photos and some information are presented. Lectotypes for two names viz. Dictyospermum ovatum (Wall.) Hassk. and asynonym Aneilema subovatum Ridl. are also selected and treated. Spatholirion calcicola K.Larsen & S.S. Larsen isnewly recorded from Laos.