posy (n.)

also posey, 1530s, "short poetical motto engraved on the inner surface of a ring," an alteration of poesy "poetry; a passage of poetry," which is recorded in this sense from early 15c. Meaning "flower; bunch of flowers, bouquet" is recorded by 1570s, from notion of the language of flowers or a custom of sending verses with flowers as gifts. The original thing later was a posy-ring (by 1833).