The sunflower symbolizes somebody who wishes to achieve serenity at its peak once ending the path they're following.
The sunflower is known to be a flower that always faces the sun, avoiding the dimly lit scenery from behind, which explains the lines <em>"Who countest the steps of the sun; Seeking after that sweet golden clime".</em>
In this case, the search for the sunlight represents going on a journey and looking forward to its end, which explains the line <em>"Where the traveller's journey is done".</em>
Finally, the lines <em>"Where the Youth pined away with desire, And the pale virgin shrouded in snow"</em> describe the scenery of wherever the sunlight resides, where youth prevails (pinned away with desire) and the environment is untouched by foul things (like a virgin shrouded in snow).
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