|This deep coppery-green, upright, branching, bush reaches between 9 and 20 feet in height, has barbed spines in the wild but is spineless in cultivation. The joints are elongated-oval or oval and grow to 10 inches in length, 1 to 2 inches wide. The short yellowish glochids extend from yellowish areoles. In summer the bell-shaped, large yellow flowers are borne singly on the stem tips and then produce reddish, subglobose fruit. This genus has the largest membership of sun loving species. Australia has even banned a few because of their rapid growth.