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Six riparian plant species representing native and invasive species from the Colorado River delta in the Sonoran Desert of Mexico were tested for salt tolerance and water use characteristics in a greenhouse study in Tucson, Arizona. Negative linear regression equations relating relative growth rates (RGR, g g⁻¹day⁻¹) of each species to mean root zone salinity had high coefficients of determination (r²=0.0573–0.0586,p< 0.05001). Salt tolerance levels, expressed as % reduction in RGR per g l⁻¹NaCl in soil solution, varied widely among species:Allenrolfea occidentalis, 0% reduction;Tamarix ramosissima, 1.058% reduction;Pluchea sericea, 3.055% reduction; andBaccharis salicifolia, Salix gooddingiiandPopulus fremontii, 7–9% reduction (p< 0.0505). Transpiration was proportional to RGR for all species. Contrary to some previous reports,Tamarixdid not have unusually high water use compared to the other …