horsemint (Noun) — An annual horsemint of central and western United States and northern Mexico.
horsemint (Noun) — 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.
horsemint (Noun) — A coarse Old World wild water mint having long leaves and spikelike clusters of flowers; naturalized in the eastern United States.