in botany, a genus of the didynamia gymnosperrmia class. The corolla consists of four segments; and the stamens are erect and distant. There are 14 species, 11 of them natives of Britain, viz., the spicata, or spear-mint; the longiflora, or horse-mint; the ro-rundiflora, or round leaved horse-mint; the piperita, or pepper mint; the gentilis, or red mint; the verticillata, or curled-mint; the arvensis, or corn-mint; the exigua, or smooth-mint; the aquatica, or water-mint; the hirsuta, or round-headed mint; and the pulegium, or penny-royal.