William Wordsworth, "I Wandered Lonely as a Cloud" (commonly known as "Daffodils"), 1804-1807.
Widely cited as the most famous poem in the English language, William Wordsworth's "I Wandered Lonely as a Cloud," is the likely source for the title of Charles Webster Hawthorne's A Golden Host of Daffodils_._
William Wordsworth, "I Wandered Lonely as a Cloud" (commonly known as "Daffodils"), originally published in 1807
I wandered lonely as a cloud
That floats on high o'er Vales and Hills,
When all at once I saw a crowd,
A host, of golden Daffodils;
Beside the Lake, beneath the trees,
Fluttering and dancing in the breeze.
This is the opening stanza from Wordsworth's second version (1815) of this poem. You can read both versions of the complete poem through the Wordsworth Trust.