Rio Grande Mock Vervain

...actually, now that i'm looking at this spotting again i'm realizing that it is Glandularia polyantha because of the the leaf structure

i was looking at a website with different flowers that grow in the Rio Grande Valley and these were the more likely candidates. i'm going to have to disagree with lantana because of the structure of the leaves.

...and here I was thinking it was some kind of Phlox. No, but you're definitely right. It is a Glandularia species, not sure which one, though..

ok, i narrowed this one down to two possibilities: Rio Grande mock vervain (Glandularia polyantha) or Dakota mock vervain (Glandularia bipinnatifida)