|This top branching, long, cylindrical green stemmed cactus has oblong side joints that grow up to 16 inches in length and 1 to 4 inches in width. The areoles have glochids of short, yellowish brown. In summer the bell-shaped, large crimson flowers are borne singly on the edge of the pads, stem tips and then produce fruit. This genus has the largest membership of sun loving species. Australia has even banned a few because of their rapid growth.