The green joints, reach up to 2 inches in length and have no spines but multiple large areoles while brownish-red or chocolate brown glochids cover the surface. In summer the large yellow or or...

The deep green joints are cylindrical, 1 to 3 inches long, slightly warty, hairy, covered with slender brown, aging to grey, spines. In summer the bell-shaped, large yellow flowers are borne si...

The prostrate pale green, smooth, narrowly flattened joints have 1 or 2 awl shaped brownish to yellowish spines extending from wide spaced areoles. In the summer the large flowers are borne sin...

The prostrate, broadly obovate, thick, glabrous joints, reach up to 4 inches wide and have 1 yellow spine in the upper greyish areoles of up to 1 inch long, while yellow glochids cover the surf...

This green, upright, cactus grows to 12 feet in height and has hairy cylindrical joints to 5 inches in length. The 4 or more yellow spines reach up to 7/8 inch in length, guarding its body. In ...

The obovate, bluish when young, sea green, powdery joints, reach up to 6 1/2 inches in length and have 1 stiff, thick spine of 1 inch extending from upper and marginal areoles while yellow gloc...

The oval, coppery green joints reach up to 10 inches in length and are spineless or have few. In summer the large orange-yellow flowers are borne singly and then produce fruit. This genus has t...

The green, oval stems reach up to 6 inches in length and have 2 to 4, yellow-white to ashy spines extending from upper areoles, while tufts of brown glochids cover the surface. In summer the la...

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 b...

The dull green, flat topped, cylindrical upright bush has side joints that are flat, oblong and slender. It is covered with gray spines extending 2 to 2 1/2 inches. In summer the bell-shaped, l...