This is a Narcissus flower. At the end of the story Narcissus turns into a flower and is still recognized today. It's known as a very beautiful flower, which also reflects the beauty of Narcissus, the man.
I Wandered Lonely as a Cloud The daffodils are like little yellow people who guide and keep the speaker company. They are human like in the trait. They dance and sway and always cheer the speaker up. He gives them a human trait of happiness.