Opuntia triacantha ( Triacantha Cactus )
The pale green , ellipse elongated joints , reach up to 3 inches . This multi - forked bush has 3 white prickle , about an inch in distance , per areole guarding its body . In summertime the bell - shaped , large yellowed flower are borne singly and then produce reddish yield . This genus has the bombastic rank of sun loving species . Australia has even banned a few because of their rapid growth ....