Parietaria pensylvanica, commonly called Pennsylvania pellitory, is a species of flowering plant in the nettle family.

[1] It is typically found in circumneutral or basic soils, in natural habitats such as calcareous cliffs and barrens, and in rich floodplains.

[1][2] It is an annual herb growing decumbent or erect to a maximum height near half a meter.

The alternately arranged leaves are lance-shaped or oval with a pointed tip and measure up to 3 centimeters in length.

The flower lacks petals but it has tiny pointed reddish brown sepals.