Look what grew from tiny seeds imbedded in my plantable calendar pages! They are such beautiful wildflowers that I researched online to learn that they are "plains coreopsis".
The following two photos that I found on www.wildflowerinformation.org helped me identify the flower. I found it quickly by typing "yellow" in the color category. Info is also sorted by common name, botanical name, height, No. American growing region, USDA zone, sun or shade preference, type (annual or perennial), soil preference, and moisture needs. The web site has wonderful photos and info about each plant, as well as a link to a site where the seeds may be purchased.
I enclosed my flowers in tomato cages because they are so tall that they were beginning to get a little too floppy. If you grew a larger patch of them, I think they would help support each other.