Parsley Piert is a smaller and even more inconspicuous plant than the Common Lady's Mantle. The stem is sometimes prostrate, but generally erect, and much branched from the base. It is rarely more than 4 inches high.
The leaves are of a dusky green colour, wedge-shaped, three-cleft, the lobes deeply cut, the whole leaf less than 1/2 inch wide, narrowed into a short foot-stalk with leafy, palmately-cut stipules, sheathing and cleaving to the footstalk. The whole plant is downy with slender, scattered hairs.
The greenish, minute and stalkless flowers are crowded together in tufts almost hidden by the leaves and their large stipules. There is no corolla, the stamens, which have jointed filaments, being inserted at the mouth of the calyx, which is usually four-cleft, as in the preceding species. The plant is in bloom from May to August. It is an annual.