Formations of halonitrophilous annuals (Frankenia pulverulenta, Suaeda splendens, Salsola soda, Cressa cretica, Parapholis incurva, P. strigosa, Hordeum marinum, Sphenopus divaricatus) colonizing salt muds susceptible to temporary inundation and extreme drying, mostly characteristic of the Iberian peninsula, with irradiations notably in the Camargue, Italy, and on the Atlantic coast of France.