Maximizing the production and fruit quality of the 'Tahiti' lime (Citrus latifolia (Yu. Tanaka) Tanaka) is directly related to the scion/rootstock combination and the production technology applied in groves. Although some research has evaluated the rootstocks for this cultivar, few studies have identified high-performance scion selections. Thus, the present study aimed to evaluate the horticultural performance of five 'Tahiti' lime selections (" IAC 5" , " IAC 5-1" , " CNPMF/EECB" , " CNPMF 2000" , and " CNPMF 2001" ) grafted onto the 'Swingle' citrumelo rootstock [Citrus paradisi Macfad. cv. Duncan x Poncirus trifoliata (L.) Raf.] under irrigated and non-irrigated conditions. The variables collected over five consecutive crop seasons included vegetative growth, crop season and off-season yields, yield efficiency, fruit quality, and CO2 assimilation rate. The " CNPMF/EECB" selection had the highest fruit production and yield efficiency, regardless of irrigation. Under irrigated conditions, the " CNPMF/EECB" selection produced the highest fruit yield during the off-season. The " IAC 5-1" , " CNPMF/EECB" , " CNPMF 2000" , and " CNPMF 2001" selections showed increased vegetative growth compared to the " IAC 5" selection, regardless of irrigation. Irrigation caused higher vegetative growth, higher early fruit bearing, increased fruit yield during the crop season and off-season, increased yield efficiency, higher juice content and acidity, and a higher percentage of fruit suitable for export, regardless of the selection evaluated. © 2012 Elsevier B.V.