[ noun ] (botany) tall erect perennial or annual having lanceolate leaves and heads of purple-spotted creamy flowers; many subspecies grown from eastern to southwestern United States and in Mexico

[ noun ] (botany) an annual horsemint of central and western United States and northern Mexico

[ noun ] (botany) a coarse Old World wild water mint having long leaves and spikelike clusters of flowers; naturalized in the eastern United States