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Northern bugleweed can be up to 2.5' tall; the stem is unbranched, square in section, and light green. The leaves are opposite, 1.5-4" long and a third as wide, elliptical in outline with 5-9 coarse, sharply-pointed marginal teeth on each side of the leaf. Each pair of opposite leaves is oriented at 90° to the pairs above and below. The flowers occur in whorls in the axils of the middle and upper leaves. Individual flowers are about 1/8" long. They have a light green, very short (1 mm) calyx with 4-5 triangular teeth; a white, tubular corolla with four (or five) lobes, the uppermost notched at the tip or sometimes in two parts; two stamens with purple anthers extending just out of the corolla tube; and a style with a bifurcated tip. The fruit is four nutlets with a bumpy upper surface and a depressed center, cupped in the calyx.

Lycopus

Lycopus uniflorus

northern bugleweed [Blooms: Jul-Aug]