Family, Vervain. Color, bluish white. Calyx and corolla, 2-lipped, the upper corolla lip notched, the lower and larger 3-divided. Leaves, oblong to ovate, or lance-shaped, toothed above the middle. Stems, weak, creeping, with slender peduncles ascending, bearing at their terminals small, roundish heads of small flowers. Stems rooting at the joints in the moist soil of river-banks or brooks. June to August.
New Jersey and Pennsylvania, southward and westward.