Thy gentlest of all gentle names dost take!
How many memories of what radiant hours
At sight of thee and thine at once awake!
How many scenes of what departed bliss!
How many thoughts of what entombéd hopes!
How many visions of a maiden that is
No more—no more upon thy verdant slopes!
No more!—alas, that magical sad sound
Transforming all! Thy charms shall please no
more—
Thy memory no more! Accurséd ground
Henceforth I hold thy flower-enameled shore,
O hyacinthine isle! O purple Zante!
"Isola d'oro! Fior di Levante!"
Here Poe refers the the purple hyacinthine flower. This flower was said to be named after a Greek boy named Hyakinthos. This boy was said to be loved by two Greek gods: Apollo (god of the sun) and Zephyr (god of the wind). One day when Apollo was teaching the boy how to throw a discus, Zephyr got jealous and blew the discus back towards Hyakinthos, subsequently killing him with a blow to the head. Apollo named the flower that grew from Hyakinthos’s blood after the boy. These flowers are said to represent consistency. 

Sonnet—To Zante