Braun's Rock-cress

This rockcress is a perennial herb with decumbent stems reaching 80 centimeters in length. The stems spread out horizontally, and often droop over the side of any structure the plant may be growing on, such as a rock or cliffside. The leaves are arranged in a basal rosette with some alternately arranged along the stem. The stems and leaves are gray-green in color due to a coating of whitish star-shaped hairs. The inflorescence is a raceme of flowers with four white or lavender petals each a few millimeters long. The fruit is a hairy silique 1.5 to 2 centimeters in length which contains tiny reddish seeds.

Some authorities divide the species into two varieties, var. perstellata (small rockcress), which is mostly limited to Franklin County, Kentucky, in the vicinity of the Kentucky River, and var. ampla (large rockcress), which is known only from Tennessee. Other authorities do not divide the species and suggest any physical differences are caused by the local environment.