Am not sure about this species. Have yet to have this bushier version ID'ed.
See also: http://www.inaturalist.org/observations/1020966
Looks too healthy for the Texas vervain I usually see.
Brief description of what you observed
Verbena Oma stock
Verbena /vərˈbiːnə/, (vervain), is a genus in the family Verbenaceae. It contains about 250 species of annual and perennial herbaceous or semi-woody flowering plants. The majority of the species are native to the Americas and Europe.