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  • Organ Pipe cactus (Stenocereu thurberi) from organ Pipe cactus National Monument, southern Arizona.
    11128-D.jpg
  • Nichol's hedgehog cactus (Echinocereus nicholii) from Organ Pipe Cactus National Monument, Arizona.
    11118-D.jpg
  • Organ Pipe cactus (Stenocereu thurberi) from organ Pipe cactus National Monument, southern Arizona.
    11131-D.jpg
  • Close up of the Organ Pipe cactus (Stenocereu thurberi) from organ Pipe cactus National Monument, southern Arizona.
    11129-D.jpg
  • Organ Pipe cactus (Stenocereu thurberi) from organ Pipe cactus National Monument, southern Arizona.
    11130-D.jpg
  • Fishhook Barrel cactus (Ferocactus wislizeni) from Superstition Mountains, Arizona, USA
    11106-D.jpg
  • Fishhook Barrel cactus (Ferocactus wislizeni) from Superstition Mountains, Arizona, USA
    11107-D.jpg
  • Fishhook Barrel cactus (Ferocactus wislizeni) from Superstition Mountains, Arizona, USA
    11104-D.jpg
  • Fishhook Barrel cactus (Ferocactus wislizeni) from Superstition Mountains, Arizona, USA
    11105-D.jpg
  • Fishhook Barrel cactus (Ferocactus wislizeni) from Superstition Mountains, Arizona, USA
    11103-D.jpg
  • Mistletoe cactus (Rhipsalis baccifera) from Palarium Reserve (Ampanakary, Atsinanana), eastern Madagascar.
    11264-D.jpg
  • Flower of the mistletoe cactus (Rhipsalis baccifera) from Palarium Reserve (Ampanakary, Atsinanana), eastern Madagascar.
    11262-D.jpg
  • Mistletoe cactus (Rhipsalis baccifera) from Palarium Reserve (Ampanakary, Atsinanana), eastern Madagascar.
    11263-D.jpg
  • Morning in Organ Pipe Cactus National Monument, southern Arizona.
    22032-D.jpg
  • Close up of a large and very old Saguaro cactus (Carnegiea gigantea) in Organ Pipe Cactus National Monument, southern Arizona
    11121-D.jpg
  • Hanging chain cholla (Cylindropuntia fulgida) from Organ Pipe Cactus National Monument, southern Arizona.
    11126-D.jpg
  • Hanging chain cholla (Cylindropuntia fulgida) from Organ Pipe Cactus National Monument, southern Arizona.
    11125-D.jpg
  • Hanging chain cholla (Cylindropuntia fulgida) from Organ Pipe Cactus National Monument, southern Arizona.
    11124-D.jpg
  • Organ Pipe Cactus National Monument, southern Arizona, USA.  Nikon D850, 24-70mm @ 24mm, f8, 1/2000sec, ISO400, Aperture priority.
    Saguaros (22048-D).jpg
  • Large specimen of Engelmann's Prickley Pear (Opuntia engelmannii) from Organ Pipe Cactus National Monument, southern Arizona.
    22062-D.jpg
  • Forest of Saguaros in Organ Pipe Cactus National Monument, southern Arizona
    22061-D.jpg
  • Back lit desert landscape with many species of cacti  in Organ Pipe Cactus National Monument, southern Arizona.
    22057-D.jpg
  • Morning in Organ Pipe Cactus National Monument, southern Arizona.
    22036-D.jpg
  • Back lit desert landscape with many species of cacti  in Organ Pipe Cactus National Monument, southern Arizona.
    22056-D.jpg
  • Spectacular desert landscape with giant Saguaro cacti  in Organ Pipe Cactus National Monument, southern Arizona.
    22053-D.jpg
  • Beautiful and very old specimens of Saguaro cacti (Carnegiea gigantea) in Organ Pipe Cactus National Monument, southern Arizona.
    22048-D.jpg
  • Morning in Organ Pipe Cactus National Monument, southern Arizona.
    22038-D.jpg
  • Desert landscape close to Organ Pipe Cactus National Monument, southern Arizona, USA
    22065-D.jpg
  • Spectacular desert landscape with many species of cacti  in Organ Pipe Cactus National Monument, southern Arizona.
    22052-D.jpg
  • Back lit desert landscape with many species of cacti  in Organ Pipe Cactus National Monument, southern Arizona.
    22055-D.jpg
  • Back lit desert landscape with many species of cacti  in Organ Pipe Cactus National Monument, southern Arizona.
    22054-D.jpg
  • Back lit desert landscape with many species of cacti  in Organ Pipe Cactus National Monument, southern Arizona.
    22051-D.jpg
  • Back lit desert landscape with many species of cacti  in Organ Pipe Cactus National Monument, southern Arizona.
    22050-D.jpg
  • Beautiful and very old specimens of Saguaro cacti (Carnegiea gigantea) in Organ Pipe Cactus National Monument, southern Arizona.
    22049-D.jpg
  • Vegetation and road in Organ Pipe Cactus National Monument, southern Arizona
    22047-D.jpg
  • Storm building up  in Organ Pipe Cactus National Monument, southern Arizona.
    22045-D.jpg
  • Vegetation and road in Organ Pipe Cactus National Monument, southern Arizona
    22046-D.jpg
  • Storm building up  in Organ Pipe Cactus National Monument, southern Arizona.
    22044-D.jpg
  • A shaded valley in Organ Pipe Cactus National Monument, southern Arizona.
    22043-D.jpg
  • Giant Saguaros in Organ Pipe Cactus National Monument, southern Arizona.
    22041-D.jpg
  • Giant Saguaros in Organ Pipe Cactus National Monument, southern Arizona.
    22042-D.jpg
  • Giant Saguaros in the morning light of Organ Pipe Cactus National Monument, southern Arizona.
    22040-D.jpg
  • Morning in Organ Pipe Cactus National Monument, southern Arizona.
    22039-D.jpg
  • Morning in Organ Pipe Cactus National Monument, southern Arizona.
    22037-D.jpg
  • Morning in Organ Pipe Cactus National Monument, southern Arizona.
    22035-D.jpg
  • Morning in Organ Pipe Cactus National Monument, southern Arizona.
    22034-D.jpg
  • Morning in Organ Pipe Cactus National Monument, southern Arizona.
    22033-D.jpg
  • Sunrize in Organ Pipe Cactus National Monument, southern Arizona.
    22030-D.jpg
  • Sunrize in Organ Pipe Cactus National Monument, southern Arizona.
    22031-D.jpg
  • Hanging chain cholla (Cylindropuntia fulgida) and Saguaros from Organ Pipe Cactus National Monument, southern Arizona.
    11127-D.jpg
  • Group of Saguaro cacti of various sizes and ages in Organ Pipe Cactus National Monument, southern Arizona.
    11122-D.jpg
  • Teddy Bear Cholla (Cylindropuntia bigelovii) from Organ Pipe Cactus National Monument, southern Arizona.
    11119-D.jpg
  • Staghorn Cholla (Cylindropuntia versicolor) from Organ Pipe Cactus National Monument, southern Arizona.
    11120-D.jpg
  • Close up of a barrel cactus (Fereocactus sp.) from southern Arizona, USA
    11101-D.jpg
  • Flowers on the Desert Christmas Cactus (Cylindropuntia leptocaulis), southern Arizona, USA
    11102-D.jpg
  • Saguaro cactus (Carnegiea gigantea) from Phoenix botanical garden, Arizona, USA. here growing among Palo Verde trees.
    11025-D.jpg
  • Saguaro cactus (Carnegiea gigantea) silhouette. Sonora Desert, Arizona, USA.
    11031-D.jpg
  • Spines on a Saguaro cactus (Carnegiea gigantea) can grow up to one mm a day. Photo from The Superstitions, Arizona.
    11112-D.jpg
  • A giant and very old Saguaro cactus in Lake Pleasant Regional Park, close to Phoenix, Arizona
    22070-D.jpg
  • 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
  • Saguaro cactus (Carnegiea gigantea) from Arizona, USA.
    11020-D.jpg
  • Gigantic and very old saguaro cactus in the desert close to Picketpost Mountain, The Superstitions, Arizona.
    11108-D.jpg
  • Saguaro cactus (Carnegiea gigantea) from Phoenix botanical garden, Arizona, USA. Here growing among Palo Verde trees.
    11029-D.jpg
  • Desert shrubs, blue palo verde, brittle brush and a young saguaro cactus in  Picacho Peak State Park (Arizona, USA). March 2020.
    22104-D.jpg
  • Morning scene from Picacho Peak State Park with csaguaro cactus and and other desert shrubs. I March 2020.
    22084-D.jpg
  • Desert shrubs, blue palo verde, and a young saguaro cactus in  Picacho Peak State Park (Arizona, USA). March 2020.
    22080-D.jpg
  • Saguaro cactus from Phoenix, Arizona, USA
    11123-D.jpg
  • Lava cactus, Brachycereus nesioticus, at Punta Espinoza, Fernandina, Galapagos.
    11043-D.jpg
  • Galapagos lave a\cactus ( Brachycereus nesioticus) endemic to Galapagos, here photographed at Santiago Island.
    11239-D.jpg
  • Desert lupines, (Lupinus sparsiflorus) and saguaro cactus in Pichaco Peak State Park (Arizona, USA) in March 2020.
    22102-D.jpg
  • Cactus Finch (Geospiza scandens) on Opuntia in Santa Cruz, Galapagos.
    42229-D.jpg
  • Rubber Euphorbia (Euphorbia tirucalli) from Satara, Kruger NP, South Africa.
    11305-D.jpg
  • Landscape close to Organ Pipe National Monument, southern Arizona, USA
    22076-D.jpg
  • Two Sagoaros in Organ Pipe National Monument, southern Arizona, USA
    22077-D.jpg
  • Landscape close to Organ Pipe National Monument, southern Arizona, USA
    22075-D.jpg
  • Organ Pipe National Monument, southern Arizona, USA
    22072-D.jpg
  • Landscape close to Organ Pipe National Monument, southern Arizona, USA
    22074-D.jpg
  • Organ Pipe National Monument, southern Arizona, USA
    22073-D.jpg
  • Beautiful and diverse desert landscape from The Superstitions, southern Arizona
    22059-D.jpg
  • Beautiful desert landscape from The Superstitions, southern Arizona
    22060-D.jpg
  • Engelmann prickly pear (Opuntia engelmannii) from the desert at Picketpost Mountain, The Superstitions, Arizona.
    11115-D.jpg
  • Beautiful and diverse desert landscape from The Superstitions, southern Arizona
    22058-D.jpg
  • Engelmann prickly pear (Opuntia engelmannii) from the desert at Picketpost Mountain, The Superstitions, Arizona.
    11117-D.jpg
  • Tracking on horseback through the desert of The Superstitions, southern Arizona, USA
    22025-D.jpg
  • Saguaro cacti (Carnegiea gigantea) from Sonora Desert, Arizona, USA
    11030-D.jpg
  • Opuntia violacea, probably var. macrocentra.  Flowering specimens from Arizona, USA.
    11034-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
  • Flowering Robust Hedgehog, Echinocereus fasciculatus, from Arizona, USA.
    11041-D.jpg
  • Most likely violet prickly pear (Opuntia gosseliniana) from the desert at Picketpost Mountain, The Superstitions, Arizona.
    11116-D.jpg
  • Large and very old saguaro cacti at Picketpost Mountain, The Superstitions, Arizona
    11110-D.jpg
  • Overlooking Lake Pleasant, Arizona, USA
    22068-D.jpg
  • Overlooking Lake Pleasant, Arizona, USA
    22067-D.jpg
  • Wash Overlook Picketpost Mountain, Tonto National Forest, Arizona, USA
    22064-D.jpg
  • Barrel cacti overlooking the city of Phoenix, Arizona, USA
    22066-D.jpg
  • Tracking on horseback through the desert of The Superstitions, southern Arizona, USA
    22023-D.jpg
  • Flowering Robost Hedgehog, Echinocereus fasciculatus, from Arizona, USA.
    11042-D.jpg
  • Saguaro cacti (Carnegiea gigantea) from Sonora Desert, Arizona, USA
    11032-D.jpg
  • Purple Prickly Per (Opuntia macrocenta) in the desert at Picketpost Mountain, The Superstitions, Arizona
    11113-D.jpg
  • Purple Prickly Per (Opuntia macrocenta) in the desert at Picketpost Mountain, The Superstitions, Arizona
    11114-D.jpg
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Alf J. Nilsen Natural History images

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