Purple coneflowers from the Clymer Meadow, west of Dallas. This is one of the last remnant tracts of the Blackland Prairie.
I love to photograph wildflowers with a very long lens, getting low to the ground and shooting into a dark, soft background, backlit the sun. If the background is far enough away, like here, you can also shoot with a small aperture (like f/16), to get the cluster of flowers sharp, but not the background. The backlighting lights up the edges of the flowers.