This native perennial plant is about 1-3' tall, sometimes branching sparingly near the base. The green or reddish central stem is four-angled and ridged; it may be hairless or slightly pubescent. This plant has a tendency to sprawl in the absence of supportive vegetation. The opposite leaves are sessile or have short petioles, and somewhat widely spaced along the stem. They are up to 3" long and ¾" across, and usually lanceolate or ovate-lanceolate in overall shape. The lower leaves are lobed or pinnatifid toward the base, while the upper leaves are coarsely dentate all along their margins. The foliage is hairless, except for a few hairs along the central vein on the lower leaf surface. Axillary whorls of white flowers occur where the upper pairs of leaves join the stem. Each flower is about 1/6" long, and has a tubular corolla with 4 spreading lobes. There are two stamens with brown anthers that are exerted outside the corolla. The green calyx is divided into 5 triangular teeth that are more than twice as long as they are across at the base. The corolla is only a little longer than the teeth of the calyx. The blooming period is from mid-summer to early fall, and lasts about 1-2 months. Neither the foliage nor the flowers have any noticeable scent. The flowers develop into nutlets that are shorter than the calyx. These nutlets are broad and flat at the top, becoming rounded and more narrow along 3 angles toward the bottom. They have a smooth surface. Their is a taproot and abundant production of rhizomes, the latter facilitating the vegetative spread of this plant.