This is a genetically stable mutation with variable, irregularly shaped ribs with raised, tubercle-like, knobby-looking swellings along the stems, and few (if any) spines or bristles. Stems are ascending, slim, lightly pruinose, and also branch just from the base and occasionally at higher levels, reverting sometimes to normal species growths. Some stems reach 6m, but they usually remain smaller (from 2 to 3m tall).