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It has a spreading habit, and grows to 60 centimetres (24 in), with stalkless, toothed leaves and bright purple or magenta, scented flowers in summer.
It is native to Brazil and Argentina, and is not fully hardy in temperate climates, where consequently it is grown from seed as an annual plant. It is widespread as a garden escapee in the Southeastern US.
Add'l web ref: http://plants.usda.gov/java/profile?symb...
Spotted on May 13, 2013
Submitted on May 17, 2013