"Verbena hastata" is a flowering plant in the vervain family, Verbenaceae. It is a herb with opposite, simple leaves which have double-serate margins, borne on stiffly erect, branching square stems. The flowers appear in summer and are purple. This is a common plant that occurs across North America. They are hardy and drought resistant.
Similar species: Lamiales
By Scott Staley
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Uploaded Oct 20, 2012. Captured Jul 1, 2009 16:38.
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http://www.florafinder.com/Species/Verbena_hastata.php
http://florapittsburghensis.wordpress.com/2010/07/27/blue-vervain-verbena-hastata/ Posted 11 years ago