Italian to English Art/Literary Poetry & Literature iconography in art

Can anyone shed light on what reali verghe could be in this context...I can't find any such reference in iconography associated with Minerva, and unfortunately I don't have an image of the painting in question.

"...rappresentare la libertà dell’America “sotto l’apparenza e le armature di una Minerva, con frigio berretto in testa in luogo di elmo, da una mano la clava, da l’altra un aperto volume, con rotte corone, e reali verghe ai piedi."
TIA