Mentha arvensis
Field mint  is a herbaceous perennial plant generally growing to  and rarely up to  tall. It has  erect or semi-sprawling squarish stems. The leaves are paired in  opposite positions. They are simple,  long and  broad. Leaves are  hairy, and with a coarsely serrated margin. The flowers are pale purple, but rarely  white or pink. These are in whorls on the stem at the bases of the leaves. Flower's Length  is  about . It  has a five-lobed hairy calyx, a four-lobed corolla with the uppermost lobe larger than the others. It has four stamens. The fruit is a two-chambered carpel.