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DescriptionThis perennial wildflower is ½-2' tall. The erect central stem is light green to reddish purple, 4-angled, and glabrous (or nearly so); it is unbranched or sparingly so along the upper half of its length. Pairs of opposite leaves occur at intervals along each stem. These leaves are ¾-1¾" long, ½-1" across, ovate, and coarsely dentate, becoming only slightly smaller as they ascend each stem. The upper surface of the leaves is medium green, slightly indented along the veins, and glabrous, while their lower surface is pale to medium green and either glabrous or slightly hairy along the lower sides of the veins. Leaf venation is pinnate with 4-6 lateral veins on each side of the midrib. The leaves are nearly sessile or they have short petioles up to ¼" long. The foliage of Red Mint has a strong spearmint fragrance. Dense whorls of nearly sessile flowers occur above the middle to upper leaves along a stem; these inflorescences are non-terminal and they do not extend beyond the middle of these leaves. Individual flowers are about 1/8" in length, consisting of a white to light pink tubular corolla with 4 lobes, a short green or reddish green calyx with 5 narrowly lanceolate teeth, either 4 or no stamens (usually the latter), and either 1 or no pistil with a single style. Some reproductive organs are often missing from the flowers because this hybrid mint is sterile. The calyx of each flower is glabrous, except along the teeth, where it is sometimes ciliate. The very short pedicels of the flowers are glabrous. The blooming period occurs from mid-summer into the early fall for about 1-2 months. Above the whorled flowers of plants in bloom, there are often pairs of opposite leaves that are without developed flowers. Because the flowers are sterile, fertile nutlets are not normally produced. The shallow root system is fibrous and rhizomatous. This wildflower reproduces vegetatively by forming clonal offsets from the rhizomes. As a result, dense colonies of plants are often formed.