Stems: erect,simple, glabrous. Leaves: oval, obtuse at the apex, dentate. Flowers: cyme terminal dense; petals longer than the oblong narrow sepals; staminate flowers with eight stamens, the pistillate ones with four carpels.
The small purplish-red flowers of this short thick plant are set in a cluster at the top of the stems, which are covered with many small leaves. It grows in the crannies between the rocks and on stony slopes.