Stems: erect, glabrous. Leaves: petioled, oblanceolate, dentate; stem-leaves oblong. Flowers: white, pedicels spreading or curved upward. Fruit: pods nearly orbicular when ripe, broad, very flat, notched at the apex, in long racemes; seeds rugose. Not indigenous.

Penny Cress very nearly resembles Shepherd's Purse, and the easiest way to distinguish between the two plants is to note that while the seed-pods of the latter are triangular in shape, those of the Penny Cress are nearly round, both being notched at the top. Then, also, the leaves differ: those of the Shepherd's Purse are deeply cut, and those of the Penny Cress are only slightly toothed. This is an introduced plant.