: vervainespecially: any of numerous garden vervains of hybrid origin widely grown for their showy spikes of white, pink, red, or blue flowers which are borne in profusion over a long season — compare lemon verbena
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borrowed from New Latin Verbena, a plant genus, going back to Medieval Latin verbēna "the plant Verbena officinalis," going back to Latin, "leafy branch used ceremonially or medicinally" — more at vervain