Local name = Brazilian verbena. In http://www.texasinvasives.org database
Observed by Anthony at the Oliver Nature Park Spring Bioblitz!
Verbena bonariensis is a tall and slender-stemmed perennial. It can grow to 6 ft (120 cm) tall and can spread to 3 ft (90 cm) wide. At maturity, it will develop a woody base. Fragrant lavender to rose-purple flowers are in tight clusters located on terminal and axillary stems, blooming from mid-summer until fall frost. The stem is square with very long internodes. Leaves are ovate to ovate-lanceolate with a toothed margin and grow up to 4 in (10 cm) long.
Texas Buckeye Trail levee.
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.