Gysophila hispanica Willk. is an iberian-levantine endemism with optimum in the Maestracensis sector (Castillan-Maestrazgo-Manchego province) and the province of Aragon, which is generally considered a gysum soil element. Analysis of the characteristics of the soils of the locations studied shows a wide edaphic spectrum and indicates that it belongs to halo(gypso)ni trophile taxa