Lepidium flavum is a species of flowering plant in the mustard family known by the common name yellow pepperweed.

The species epithet flavum is Latin for yellow and indicates its flower colour.

[1][2] Lepidium flavum is a short, mostly prostrate annual herb producing a branching stem up to about 40 centimeters tall when growing upright.

The fleshy lobed or toothed leaves grow in a basal rosette at ground level and along the stem, the lowest and longest reaching a few centimeters long.

The plant blooms in inflorescences of many small flowers, each with yellow petals just a few millimeters long and six stamens at the center.