Final answer:
The speaker uses the literary device of imagery in the phrase 'fragrant memories of the vanished flowers'.
Step-by-step explanation:
The literary device used in the phrase 'fragrant memories of the vanished flowers' is imagery.
Imagery is a literary device that appeals to the reader's senses, creating vivid and descriptive mental images. In this phrase, the speaker is using descriptive language to evoke an olfactory image, invoking the sense of smell by describing the memories as 'fragrant' and associating them with the scent of flowers.
Learn more about imagery in literature