Tree Medick

''Medicago arborea'' is a plant species of the genus ''Medicago''. Common names include moon trefoil, shrub medick, alfalfa arborea, and tree medick. It is found throughout Europe and especially in the Mediterranean basin, primarily on rocky shores among shrubby vegetation. It forms a symbiotic relationship with the bacterium ''Sinorhizobium meliloti'', which is capable of nitrogen fixation. It is the only member of the genus ''Medicago'' which is used as an ornamental. ''M. arborea'' is sometimes misidentified as ''Cytisus'', which it resembles.