This is the biggest and densest colony of old plainsman (Hymenopappus scabiosaeus) I think I've ever seen. Mixed in are prairie verbena (Glandularia bipinnatifida), Texas star (Lindheimera texana), Engelmann's daisy (Engelmannia peristenia), and some other natives.

You can see four pictures on my nature photography blog beginning with the post at:

http://portraitsofwildflowers.wordpress.com/2013/04/19/it-hasnt-been-a-fantabulous-wildflower-spring-here-but-this-is-still-texas/