Kingdom: Plantae
(Unranked): Angiosperms
(Unranked): Eudicots
(Unranked): Asterids
Order: Lamiales
Family: Verbenaceae
Genus: Verbena
Species: V. rigida
Binomial name: Verbena rigida
Synonyms: Verbena rigida var. lilacina, Verbena rigida var. rigida, Verbena venosa
Common name: Rough Verbena, Stiff Verbena, Sandpaper Verbena, Upright Verbena, Tuberous Vervain, Slender vervain
Verbena rigida is a flowering herbaceous perennial plant and is native to Brazil and Argentina. It will grow to 60 centimetres and it has a spreading habit, with stalkless toothed leaves and bright purple or magenta, scented flowers in summer. There are numerous cultivars.
It can become invasive.
Verbena rigida near the end of flowering
[3]
The rough stem.
[7]
More photos http://davesgarden.com/guides/pf/showimage/124600/
Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0/