Mentha Arvensis, Japanese Mint - Plant
Wild mint is a herbaceous perennial plant generally growing to 10to60 cm (3.9to23.6 in) and rarely up to 100 cm (39 in) tall. It has a creeping rootstock from which grow erect or semi-sprawling squarish stems. The leaves are in opposite pairs, simple, 2to6.5 cm (0.79to2.56 in) long and 1to2 cm (0.39to0.79 in) broad, hairy, and with a coarsely serrated margin. The flowers are pale purple (occasionally white or pink), in whorls on the stem at the bases of the leaves. Each flower is 3 to 4 mm (0.12 to 0.16 in) long and has a five-lobed hairy calyx, a four-lobed corolla with the uppermost lobe larger than the others and four stamens. The fruit is a two-chambered carpel.