Slender Vervain is a perennial herb, planted as ground
cover plant in gardens. On average it grows to about 2 ft tall. Leaves
are opposite, lance-shaped 5-10 cm long, rough to the touch, with
coarsely toothed margins. Flowers are borne in 5-7 cm wide cluster of
purple to lilac flowers, on stiffly erect spikes. Individual flowers
are pinwheel-shaped. Slender Vervain comes from southern Brazil and
Argentina.
Identification credit: S. Kasim
Photographed in Kodaikanal & Ooty, Tamil Nadu.
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The flower labeled Slender Vervain is ...