About Parietaria pensylvanica Muhl. ex Willd.
Parietaria pensylvanica, commonly known as Pennsylvania pellitory, is a flowering plant species in the nettle family. It is native to a large portion of North America: it grows in every Canadian province except the Maritimes, Newfoundland and Labrador, and Yukon Territory, every U.S. state except Alaska and Hawaii, and also occurs in northern Mexico. It typically grows in circumneutral or basic soils. Its natural habitats include calcareous cliffs, barrens, and rich floodplains, and it can also be found in disturbed areas. It is an annual herb that grows either decumbent or erect, reaching a maximum height of around half a meter. Its leaves are arranged alternately, are lance-shaped or oval with a pointed tip, and grow up to 3 centimeters long. Its inflorescence is a cluster of flowers that grows out from the leaf axils. The flowers do not have petals, but do have tiny, pointed reddish brown sepals.
