In medieval times, a knight was walking with his lady by the river. He reached down to pick up some flowers. The weight of his armor caused him to fall into the river. As he was drowning, he threw the flowers to his love and shouted "Forget me not!" These flowers were so named. Really! What a dense knight in shining armor was he? No wonder it was called the dark ages. If one is unforgettable, there is no need to remind others.
Forget-me-not comes in multiple colors from blue to red. Yes, I am blue when you are not with me. I turn pink when you are around.