There were lots of clumps of these yellow flowers amongst the creosote bushes in Big Bend on my sping shoot in 2001. These were taken just west of the park headquarters building, but there were lots of them everywhere.

Photo Details: Nikon N90s, Nikon 85/2.8 Tilt Shift, Velvia, f11@250, Manfrotto CF4221 w/ Kirk BH-1.