The ornamental design for a flowerholder and integratedcrypt cover fastening rosette, as shown and described.
FIG. 1 is a top, back, left side perspective view of a first embodiment of a flower holder and integrated crypt cover fastening rosette showing my new design; and,
FIG. 2 is a bottom, front, right side perspective view thereof.
The broken line showing of a rosette is for the purpose of illustrating environment and forms no part of the claimed design.