Purpletop vervian - Verbena bonariensis
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Native range is Brazil and Bolivia to Argentina and Chile, now widespread in South America and many other parts of the world (Wagner et al., 1999; p. 1325).
This is a coarse, erect annual or perennial herb 3-20 dm tall, sometimes somewhat woody toward base; stems erect, conspicuously quadrangular, scabrous to hispid. Leaves decussate, lanceolate to oblong-lanceolate, 4.5-13 cm long, 0.6-2 cm wide, upper surface rugose and hirtellous, lower surface spreading pubescent, both surfaces occasionally hirsute or scabrous, margins somewhat revolute, unequally serrate, entire toward base, apex acute, base cordate, sessile and somewhat clasping the stem. Flowers numerous in 4-10 spikes 1-2 (-5) cm long, these in a paniculate arrangement, bracts lanceolate, as long as or slightly longer than calyx; calyx ca. 3 mm long, hispidulous, not glandular pubescent; corolla blue, violet, lavender, or purple, the tube ca. 6-7 mm long (Wagner et al., 1999; pp. 1325, 1896).
Verbena bonariensis commonly known as - purple top – and sometimes as Argentinean vervain , South American vervain , tall verbena , purpletop vervain, or purpletop verbena.
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. 1999. Manual of the flowering plants of Hawaii. Revised edition. Bernice P. Bishop Museum special publication. University of Hawai‘i Press/Bishop Museum Press, Honolulu. 1919 pp. (two volumes).
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For more information on this plant or management please contact US Army Corp of Engineers