Trailing perennial herb with ascending or erect stems to 6 dm from a prostrate or distally assurgent, rooting aerial stem or superficial rhizome; lvs short-petiolate, with lance-elliptic or ovate, ± distinctly acute blade mostly 2–6 × 1–4.5 cm, 1.5–5 times as long as wide, broadest below or near the middle, saliently toothed to below the middle, with 5–10 teeth per side; spikes pedunculate from the axils, at first capitate, less than 1 cm, and fully as thick as long, but elongating to 1–2 cm during anthesis; bracts broad, 2.5–3 mm, equaling or usually surpassing the cal; cor white or pink, often with a yellow eye, the tube ca 2 mm, the lower lip 1.5–2 mm, the upper much shorter; 2n=32, 36. Moist, low ground and muddy flats, both coastal and inland; Ont., to Minn. and S.D., s. to Fla. and Mex. May–Oct. (Lippia l.)
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