This is a mail-away pattern (#7302) which was offered in newspapers in the 1940s from Needlecraft Services. The transfers were meant to be stitched as quilt blocks, and the instructions included a diagram of a quilt 3 blocks x 4 blocks with sashing and a wide border. The completed size was 72″ x 102″.
These designs would also look pretty used individually — I’m thinking on a pillow for a birthday gift.
I just managed to find the chart with flower names and colors which I have added as the last photo in the gallery.