|The green branching, slender stems criss-crossing each other have linear joints to 5 inches in length. The round, white closely set areoles have yellow glochids with 3/8 inch tufts and it is also heavily guarded with spines. In summer the bell-shaped, large golden yellow flowers will fade to a red tint and are borne singly on the 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.