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  • The shore of the island of Santa Fe, Galapagos, with the giant Opuntia cactus (Opuntia echios var. barringtonensis) an endemic subspecies to the island.
    78047-D.jpg
  • Opuntia stricta from Engaruka, Tanzania (2006).  This invasive cactus species represent a big problem in Tanzania and other East-African countries. It grows forming dense mono-specific strands that completely disrupt habitats by displacing native species, reducing native biodiversity and modifying successional patterns.
    11240-D.jpg
  • Large specimen of Engelmann's Prickley Pear (Opuntia engelmannii) from Organ Pipe Cactus National Monument, southern Arizona.
    22062-D.jpg
  • Purple Prickly Per (Opuntia macrocenta) in the desert at Picketpost Mountain, The Superstitions, Arizona
    11114-D.jpg
  • Flower of Opuntia violacea, probably var. macrocentra. Arizona, USA.
    11040-D.jpg
  • Cactus Finch (Geospiza scandens) on Opuntia in Santa Cruz, Galapagos.
    42229-D.jpg
  • Purple Prickly Per (Opuntia macrocenta) in the desert at Picketpost Mountain, The Superstitions, Arizona
    11113-D.jpg
  • Vegeration on South Plaza (Galapagos) is dominated by the Galapagos Carpet Weed (Sesuvium edmonstonei) and Opuntia cacti. In the background are tourists vessels and the twin island North Plaza.
    78050-D.jpg
  • Opuntia violacea, probably var. macrocentra.  Flowering specimens from Arizona, USA.
    11034-D.jpg
  • Opuntia violacea, probably var. macrocentra. From Arizona, USA.
    11039-D.jpg
  • Engelmann prickly pear (Opuntia engelmannii) from the desert at Picketpost Mountain, The Superstitions, Arizona.
    11115-D.jpg
  • Opuntia violacea (var. santa-rita). Flowering specimen from Arizona, USA.
    11036-D.jpg
  • Opuntia violacea, probably var. macrocentra.  Flowering specimens from Arizona, USA.
    11035-D.jpg
  • Opuntia violacea (var. santa-rita). Flowering specimen from Arizona, USA.
    11037-D.jpg
  • Most likely violet prickly pear (Opuntia gosseliniana) from the desert at Picketpost Mountain, The Superstitions, Arizona.
    11116-D.jpg
  • Engelmann prickly pear (Opuntia engelmannii) from the desert at Picketpost Mountain, The Superstitions, Arizona.
    11117-D.jpg
  • Desert landscape with prickly pear and saguero cacti from Picacho Peak State Park (Arizona, USA) in March 2020.
    22087-D.jpg
  • Hanging chain cholla (Cylindropuntia fulgida) from Organ Pipe Cactus National Monument, southern Arizona.
    11125-D.jpg
  • Staghorn Cholla (Cylindropuntia versicolor) from Organ Pipe Cactus National Monument, southern Arizona.
    11120-D.jpg
  • Lave rock formation with prickly pear cacti at Santiago Island, Galapagos.
    78073-D.jpg
  • Hanging chain cholla (Cylindropuntia fulgida) from Organ Pipe Cactus National Monument, southern Arizona.
    11124-D.jpg
  • Hanging chain cholla (Cylindropuntia fulgida) from Organ Pipe Cactus National Monument, southern Arizona.
    11126-D.jpg
  • Blooming desert at Picacho Peak State Park (Arizona, USA) in March 2020.
    22092-D.jpg
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Alf J. Nilsen Natural History images

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