They are small plants with oblong leaves and deep blue flowers, which bloom profusely in spring and early summer gathered in clusters. It owes its name to a German legend. Two boyfriends strolled along the banks of the Danube, the boy leaned over to pick up a flower, but stumbled falling into the water; while he was drowning, he threw the flower to the shore shouting his last words to his fiancée: "don't forget me!".