Six to twenty inches high. Stems. - Branching, slender. Leaves. - Opposite, the lower oval, the upper ovate - lance-shaped, clasping by the heart-shaped base. Flowers. - Blue and white, long-stalked, appearing whorled in the axils of the upper leaves. Calyx. - Deeply five-cleft. Corolla. - Deeply two-lipped, the upper lip two-cleft, the lower three-cleft. Stamens. - Four. Pistil. - One,

Unfortunately these dainty flowers are not found farther east than Western New York. From there they spread south and westward, abounding so plentifully in the vicinity of Cincinnati that the moist meadows are blue with their blossoms in spring or early summer.