This species, from Ethiopia, makes a delightful container plant, staying relatively small with proliferous stems. Those stems branch repeatedly, forming large mounds up to 10-12 feet in diameter in nature but constrained by your pot size. The stems are square with small, paired, white spines, and the cyathia are yellow. We think this plant could be hardy in Tucson. The rooted cuttings are in 5-inch pots.