I'm not a floriculturist like J. Lawrence Heinl, so I can't comment much on this 1953 guide to growing these flowers, but I've always liked the cover and the cute little anthropomorphic drawings inside.
Padding out several pages at the end are lists of varieties, with fine names like Mentor Boy, Dainty Maid, Blushing Maiden Supreme, and Amazon Purple Prince, as well as a whole set of hybrids "from Mrs. Wm. R. DuPont," including DuPont Blue, DuPont Lavender Pink, Mrs. W. K. DuPont, and Christina.
(Weird effect on scanning the cover, which has a dappled gray coloring. It looks odd on my monitor at some sizes, showing up with a interference pattern.)