There is small chance of overlooking this little member of the Mint family because of its size. Whatever it lacks in this respect, it more than makes up for in the familiar fragrance exhaled by its foliage. Its pleasing, aromatic pungency permeates the atmosphere for a considerable distance, and is always sure to attract the attention of the passer-by. The odour is believed to keep away mosquitoes, and for this purpose the oil of Pennyroyal is popular with hunters, campers and summer vacationists. It is also used as a gentle stimulant, and for relieving cramps and sick stomachs, which children are prone to experience. It has a pleasant taste, and there is no harm in nibbling its leaves as we do those of the Wintergreen. The erect and very slender, leafy stalk of this annual herb is branching and hairy, and grows from six to eighteen inches high in dry, grassy fields and pastures. The small, strongly scented leaves are somewhat egg-shaped, tapering at the base into short stems, and their margins are scantily toothed. They occur in alternating, opposite pairs, which graduate in size as they mount the square stalk. The tiny, two-lipped, tubular, purple flowers are gathered in the axils of the leaves, and form long, slender, terminal spikes. The erect, upper lip is usually flat and notched, and the lower one is three-lobed and spreading. It is found from July to September, from Canada to Florida, and westward to Nebraska and the Dakotas.