It's 1852, not 1851, for the introduction. Your quote from l'Horticulteur Français of September 1852 tells us that the roses (of the new season) begin to be announced; and 'Elyse Flory' [sic] is one of them; this classification as an 1852 rose is repeated by the same publication in 1856, when it includes 'Elise Flory' [sic] among the "about 80 new roses" released in the Fall 1852 season.