Actinorhizal plants are dicotyledons distributed among three angiosperm orders, 8 families and 24 genera:[REF] These three orders form a single clade within the Rosids, which is a sister taxon to the other major nitrogen-fixing order, the Fabales.
Many are common plants in temperate regions like alder, bayberry, sweetfern, Avens, mountain misery and Coriaria.