Stanzas to Miss Wylie
Flora's riches
Flora is the Roman goddess of flowers and spring. Keats uses classical references even in lightweight courtship poems—it's his default mode.
sylph lightly swims
Sylphs are air spirits from Pope's *Rape of the Lock*. Keats is borrowing from fashionable 18th-century fancy poetry—this is deliberately old-fashioned.
amorous zephyr
A zephyr is the west wind, personified in Greek myth as a gentle breeze. He's pretending his breath is just wind before revealing the physical touch.
press thy fair knee
The poem's only genuinely forward moment—he moves from sighing to touching. This is the seduction's actual move, wrapped in pastoral fluff.