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.

Purple Coneflower on Blackland PrairieCanon 1DS Mark III.  1000mm.  ISO 400.  f/16 @ 1/40 sec.