Verbena hastata, commonly known as the American vervain, blue vervain, simpler's joy, or swamp verbena, is a
perennial flowering plant in the vervain family,
Verbenaceae. It grows throughout the continental United States and in much of southern Canada.
V. hastata grows as a stiffly erect stem, occasionally branching in the upper half, reaching up to 1.5 metres (5 feet) tall. The stems are four-angled (square), hairy, and green to reddish in color. Leaves are opposite, simple, and measure up to 15 centimetres (6 inches) long and 3 centimetres (1 inch) across. This photograph, which was
focus-stacked from 50 separate images, shows a
V. hastata inflorescence.
Photograph credit: Dominicus Johannes Bergsma
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