As you can see, this is not a terribly attractive specimen … lumpy, scarred, sparsely covered with small but very sharp spines. Nevertheless once a year it produces one or two very large, pure white flowers. They open in the middle of the night, and last only through the next afternoon.
Opuntia engelmannii (tardospina ) flower; plant and photo Bill Hendricks, USA. And: Opuntia engelmannii (tardospina ) fruit; plant and photo Bill Hendricks, USA
Cold-hardy cactus: Opuntia basilaris v. aurea and an Opuntia basilaris hybrid. Plants and photos, Bill Hendriks, USA.
Cylindropuntia (Opuntia ) Magenta flower, plant and photo (Bill Hendricks, USA). Photos from his Cold Hardy Cactus Collection.
Cold-hardy cactus: Cylindropuntia (Opuntia) whipplei. Plant and photo by Bill Hendricks, USA.
Cold-hardy cactus: Cylindropuntia (Opuntia) viridiflora, Santa Fe County, New Mexico. Plant and photo by Bill Hendricks, USA.