Flower Key

FIG. 1 is a front perspective view of a flower key showing the design; FIG. 2 is a front view thereof; FIG. 3 is a rear view thereof; FIG. 4 is a top view thereof; FIG. 5 is a bottom view thereof; FIG. 6 is a left side view thereof; and, FIG. 7 is a right side view thereof. The broken lines shown in the drawings depict portions of the flower key that form no part of the claimed design.