It is an annual herb producing an unbranched erect stem 30 to 70 centimeters in height. The thick, waxy leaves are generally oval in shape, up to 9 centimeters long, and clasp the stem at their bases. The flower is enclosed in pointed sepals and has yellow, clawed petals about a centimeter long. The fruit is a beaded silique up to 13 centimeters long. The plant is known to be toxic to livestock.