Corollas a little large, 10-11mm, and calyces 5-6mm. Leaves smell of camphor. Lots of these on the Base Trail behind Enchanted Rock. Was a bit in hurry on these photos.
Shape of leaves: Ovate
I found this one on a rocky slope.
Soil profile: 80% Olmedo very gravelly fine sandy loam, 1 to 8 percent slopes (OmD), 10% - Goliad