A voyage to the Isle of Mauritius (1775) …bears Little flowers like roses; upon its stem there are five or six, variegated alike, from a deep blood-red to the brightest scarlet.
These may be references to Hibiscus mutabilis.
Dictionnaire classique d'histoire naturelle, Volume 14, page 668 (1828) Rose changeante ou de Cayenne (Bot. Phan.), une Ketmie.
Ketmie is an old name for Hibiscus. E.g., Ketmie changeante = Hibiscus mutabilis Ketmie gombo = Hibiscus esculentus (okra)
Jedmar, My bad. In the 1812 statement, "C’est peut-être cette rose de la Chine que la père Kirchner a eue en vue, dans sa description de la rose changeante de ces pays", it was Kirchner who I think was probably discussing Hibiscus mutabilis.
I can't remember now why I included the 1775 reference.