American Pennyroyal.Hedeoma pulegioides.
Found, from July to September, in upland fields and pastures.
The sometimes branching stalk is slender, but strong in fibre; it grows from 5 to 10 inches high, and is hairy to the touch. Green in color.
The small leaf is long-pointed, with a slightly toothed margin, and somewhat roughened surface. It is medium green in color. The leaves, on slight stems, are set in pairs, which occur closely, and at right angles to each other.
The corolla of the very small flower consists of a downy 2-lipped tube, the upper lip being largest, flat, and notched at the tip, the lower 3-cleft; it is lavender in color. The small calyx is 5-parted. The flowers are set, on tiny stems, in rings about the stalk in the angles of the leaves, forming a terminal spine.
The perfume of the Pennyroyal is carried to a considerable distance,—were it not for this aromatic pungency the casual observer would often fail to find its haunt, so closely does it keep itself among the grasses of the pasture.