Both The Plant List an POWO recognize Brazoria scutellarioides as a synonym of Warnockia scutellarioides.

Molecular analysis with a few low-copy loci suggests Warnockia is sister to Brazoria or sister to Physostegia.

https://openi.nlm.nih.gov/detailedresult?img=PMC4958014_peerj-04-2220-g002&query=&req=4