Floris van Breugel / Barrel cacti (Ferocactus pilosus) and Ocotillo overlook Palm oasis at sunrise, Anza-Borrego Desert State Park, California, USA March

Floris van Breugel / Ocotillo (Fouquieria splendens) in morning sun, Anza-Borrego State Park, California, USA February

Donald M. Jones / Pyrrhuloxia (Cardinalis sinuatus) male feeding on Ocotillo (Fouquieria splendens) flowers, southern Arizona

Cyril Ruoso / Verreaux's sifakas (Propithecus verreauxi) in Madagascar ocotillo (Alluaudia procera) trees Berenty, Madagascar.

Donald M. Jones / Cactus Wren (Campylorhynchus brunneicapillus) singing from atop a flowering Ocotillo (Fouquieria splendens), southern Arizona

Neil Lucas / Boojum tree (Fouquieria columnaris) Catavina, Baja, Mexico

Jack Dykinga / Ocotillo cactus (Fouquieria splendens) in desert landscape strewn with rod lava rock, Cabeza Prieta Mountains in the distance, dawn, Cabeza Prieta National Wildlife Refuge, Arizona, USA

Jack Dykinga / Ocotillos (Fouquieria splendens) amongst flowering Mexican Poppies (Eschscholtzia mexicana) on east facing slopes, Sonoran Desert National Monument, Arizona, USA

Tim Fitzharris / Opuntia (Opuntia sp) in Chihuahuan Desert landscape, Big Bend National Park, Texas

Claudio Contreras / Ocotillo (Fouquieria splendens) and Saguaro (Carnegiea gigantea) at sunset in Sonoran Desert. El Pinacate Biosphere Reserve, northwest Mexico.

Claudio Contreras / Sonoran Desert with Saguaro (Carnegiea gigantea) and Teddy-bear Cholla (Cylindropuntia bigelovii) cactic, alongside Ocotillo (Fouquieria splendens). El Pinacate Biosphere Reserve, Sonoran Desert, nort...

Claudio Contreras / Sonoran Desert on volcanic soil with Teddy-bear cholla (Cylindropuntia bigelovii), Saguaro (Carnegiea gigantea) and ocotillo (Fouquieria splendens). El Tecolote volcano, El Pinacate Biosphere Reserve,...

Claudio Contreras / Boojum tree (Fouquieria columnaris) at night with the Orion Constellation, Sonoran Desert, Valle de los Cirios Biosphere Reserve, Baja California Peninsula, Mexico, March

Claudio Contreras / Boojum tree (Fouquieria columnaris), Sonoran Desert, Valle de los Cirios Biosphere Reserve, Baja California Peninsula, Mexico, March

Claudio Contreras / Boojum tree (Fouquieria columnaris), Valle de los Cirios Biosphere Reserve, Sonoran Desert, Baja California Peninsula, Mexico, May

Doc White / Boojum tree (Fouquieria columnaris), unique to central Baja California, Mexico

Doc White / Boojum tree (Fouquieria columnaris), unique to central Baja California, Mexico

Doc White / Boojum tree (Fouquieria columnaris), unique to central Baja California, Mexico

Tim Fitzharris / California Desert Dandelion (Malacothrix californica) flowers and Ocotillo (Fouquieria splendens) in spring, Joshua Tree National Park, California

Cyril Ruoso / Boojum tree (Fouquieria columnaris) at dusk, Vizcaino Desert, Baja California, Mexico, May.

Cyril Ruoso / Boojum tree (Fouquieria columnaris), Elephant cactus (Pachycereus pringlei) and Datilillo (Yucca valida) silhouetted at night, Vizcaino Desert, Baja California, Mexico, May.

Cyril Ruoso / Boojum trees (Fouquieria columnaris) Vizcaino Desert, Baja California, Mexico, May.

Cyril Ruoso / Harris' hawk (Parabuteo unicinctus) on nest in a Boojum tree (Fouquieria columnaris) Vizcaino Desert, Baja California, Mexico, May.

Tim Fitzharris / Ocotillo (Fouquieria splendens) with rainbow Gobbler Knob formation, Sacramento Mountains, Lincoln,New Mexico

Tim Fitzharris / Ocotillo (Fouquieria splendens) and mesa, Lincoln National Forest, Sacramento Mountains, New Mexico

Tim Fitzharris / Agave (Agave sp) and Ocotillo (Fouquieria splendens), Lincoln National Forest, Sacramento Mountains, New Mexico

Tim Fitzharris / Agave (Agave sp) and Ocotillo (Fouquieria splendens), Lincoln National Forest, Sacramento Mountains, New Mexico

Donald M. Jones / Pyrrhuloxia (Cardinalis sinuatus) male feeding on Ocotillo (Fouquieria splendens) flowers, southern Arizona

Donald M. Jones / Pyrrhuloxia (Cardinalis sinuatus) male feeding on Ocotillo (Fouquieria splendens) flowers, southern Arizona

Donald M. Jones / Pyrrhuloxia (Cardinalis sinuatus) male feeding on Ocotillo (Fouquieria splendens) flowers, southern Arizona

Donald M. Jones / Pyrrhuloxia (Cardinalis sinuatus) male feeding on Ocotillo (Fouquieria splendens) flowers, southern Arizona

Donald M. Jones / Pyrrhuloxia (Cardinalis sinuatus) male feeding on Ocotillo (Fouquieria splendens) flowers, southern Arizona

Donald M. Jones / Curve-billed Thrasher (Toxostoma curvirostre)on ocotillo, North America

Jouan Rius / Ocotillo plant (Fouquieria splendens) in winter, Organ Pipe Cactus National Monument, Sonoran Desert, Arizona, USA, December 2012.

Cyril Ruoso / Black-chinned Hummingbird (Archilochus alexandri) on Ocotillo (Fouquieria splendens) cactus, El Vizcaino Biosphere Reserve, Mexico

Cyril Ruoso / Black-chinned Hummingbird (Archilochus alexandri) visiting Ocotillo (Fouquieria splendens) cactus flowers, El Vizcaino Biosphere Reserve, Mexico

Tim Fitzharris / Ocotillo (Fouquieria splendens) flowering, Joshua Tree National Park, California

Richard Herrmann / Desert Bighorn Sheep (Ovis canadensis nelsoni) female with Ocotillo (Fouquieria splendens), Anza-Borrego State Park, California

Rolf Nussbaumer / Scott's Oriole (Icterus parisorum) female feeding on blooming Ocotillo (Fouquieria splendens), Chisos Basin, Chisos Mountains, Big Bend National Park, Chihuahuan Desert, West Texas, USA

Rolf Nussbaumer / Scott's Oriole (Icterus parisorum) male feeding on flowering Ocotillo (Fouquieria splendens) Chisos Basin, Chisos Mountains, Big Bend National Park, Chihuahuan Desert, West Texas, USA

Rolf Nussbaumer / Scott's Oriole (Icterus parisorum) female feeding on flowering Ocotillo (Fouquieria splendens) Chisos Basin, Chisos Mountains, Big Bend National Park, Chihuahuan Desert, West Texas, USA

Rolf Nussbaumer / Blue-throated Hummingbird (Lampornis clemenciae) male feeding on flowering Ocotillo (Fouquieria splendens) Chisos Basin, Chisos Mountains, Big Bend National Park, Chihuahuan Desert, West Texas, USA

Rolf Nussbaumer / Black-chinned Hummingbird (Archilochus alexandri) female feeding on Ocotillo (Fouquieria splendens) Chisos Basin, Chisos Mountains, Big Bend National Park, Chihuahuan Desert, West Texas, USA

Neil Lucas / Boojum tree (Fouquieria columnaris) and Cardon cactus (Pachycereus pringlei) in desert, Baja, Mexico, May 2007

Neil Lucas / Boojum tree (Fouquieria columnaris) Baja Mexico, May 2007

Neil Lucas / Boojum tree (Fouquieria columnaris) and Cardon cactus (Pachycereus pringlei) in desert at sunset, Baja, Mexico, May 2007

Neil Lucas / Boojum tree (Fouquieria columnaris) and Cardon cactus (Pachycereus pringlei) in desert at sunset, Baja, Mexico, May 2007

Neil Lucas / Boojum tree (Fouquieria columnaris) at sunset, Baja Mexico, May 2007

Neil Lucas / Boojum tree (Fouquieria columnaris) and Cardon cactus (Pachycereus pringlei) silhouetted at sunset, Catavina, Baja, Mexico, May 2007

Neil Lucas / Boojum tree (Fouquieria columnaris) and Cardon cactus (Pachycereus pringlei) silhouetted at sunset, Catavina, Baja Mexico, May 2007

Patricio Robles Gil / Boojum tree (Fouquieria columnaris) and Cardon cactus (Pachycereus sp) viewed through a window in coastal rock, Catavina desert, Baja California, Mexico

Doug Wechsler / Ocotillo plant {Fouquieria splendens} in leaf and flower following the rains, Organ Pipe cactus NM, Arizona, USA

Jack Dykinga / Senita cactus (Pachycereus schottii) and Boojum (Fouquieria columnaris) amongst granite boulders at sunset. Central Desert, Baja California, Mexico

Jack Dykinga / Ocotillos (Fouquieria splendens) after summer rains, amongst Velvet-pod mimosa (Mimosa dysocarpa) in the grassy foothills of the Atascosa Mountains, Coronado National Forest, Arizona

Nigel Bean / Ocotillo plant {Fouquieria splendens} in leaf following the rains, Sonoran desert, Arizona, USA

Nigel Bean / Ocotillo plant {Fouquieria splendens} in leaf following the rains, Sonoran desert, Arizona, USA

Steven Kazlowski / Boojum trees (Fouquieria columnaris) in the desert on the Baja California Peninsula, Mexico

Philippe Clement / Desert spiny lizard (Sceloporus magister) climbing Ocotillo (Fouquieria splendens). Saguaro National Park, Arizona, USA

Philippe Clement / Ocotillo (Fouquieria splendens) flowers and thorns. Organ Pipe Cactus National Monument, Arizona, USA.

Philippe Clement / Ocotillo (Fouquieria splendens) in flower. Organ Pipe Cactus National Monument, Arizona, USA

Philippe Clement / Ocotillo (Fouquieria splendens) in flower. Organ Pipe Cactus National Monument, Arizona, USA

Philippe Clement / Desert spiny lizard (Sceloporus magister) climbing Ocotillo (Fouquieria splendens). Saguaro National Park, Arizona, USA

Philippe Clement / Sonoran Spiny-tailed Iguana (Ctenosaura hemilopha macrolopha) basking on Ocotillo (Fouquieria splendens) cactus. Arizona, USA. (Native to Mexico). Captive.

Philippe Clement / Ocotillo (Fouquieria splendens) in flower. Organ Pipe Cactus National Monument, Arizona, USA

Philippe Clement / Ocotillo {Fouquieria splendens} in bloom and Saguaro cactus {Carnegiea gigantea}, Organ Pipe Cactus National Monument, Arizona, USA

Patricio Robles Gil / Ocotillo (Fouquieria splendens) landscape, Chihuahuan Desert, Sierra del Carmen region, Coahuila state, Mexico

Patricio Robles Gil / Ocotillo (Fouquieria splendens) landscape, Chihuahuan Desert, Sierra del Carmen region, Coahuila state, Mexico

Patricio Robles Gil / Ocotillo (Fouquieria splendens) landscape, Chihuahuan Desert, Sierra del Carmen region, Coahuila state, Mexico

Patricio Robles Gil / Ocotillo (Fouquieria splendens) and other vegetation, Chihuahuan Desert, Sierra del Carmen region, Coahuila state, Mexico

Patricio Robles Gil / Red-tailed Hawk (Buteo jamaicensis) perching on dead Ocotillo (Fouquieria splendens) cactus branch, Sierra del Carmen region, Mexico

Patricio Robles Gil / Ocotillo (Fouquieria splendens) growing along the Rio Grande River, Sierra del Carmen region, Mexico

Patricio Robles Gil / Opuntia (Opuntia sp) cactus in bloom, Chihuahuan Desert, Mexico

Tim Fitzharris / Ocotillo (Fouquieria splendens) in bloom, Big Bend Ranch State Park, Chihuahuan Desert, Texas

Tim Fitzharris / Ocotillo (Fouquieria splendens), Big Bend Ranch State Park, Chihuahuan Desert, Texas

Jack Dykinga / Close-up of colourful leaves and spines of an Ocotillo (Fouguieria splendens), leaves turn red in dry season after the wet season, Tinajas Atlas Mountains, Goldwater Range, Arizona

Jack Dykinga / Ocotillos (Fouquieria splendens) established on the Pincata Lava flow, dawn, Cabeza Prieta National Wildlife Reserve, Arizona

Jack Dykinga / Flowering Ocotillo (Fouquieria splendens) at sunrise, Cabeza Prieta Mountains, Cabeza Prieta National Wildelife Refuge, Arizona

Jack Dykinga / Ocotillo (Fouquieria splendens) and Saguaro (Carnegiea gigantea) cacti silhouetted against a colourful sunset, Cabeza Prieta National Wildlife Reserve, Arizona

Jack Dykinga / Boojum tree {Idria / Fouquieria columnaris} with lichen {Ramelina reticulata} with sun shining through morning fog, El Rosario, Sonoran desert, Baja California, Mexico

Jack Dykinga / Goldeneye {Viguiera deltoidea} flowering at base of Boojum tree {Fouquieria / Idria columnaris} with Cardon cactus {Pachycereus pringlei} Baja California, Mexico

Jack Dykinga / Boojum tree {Fouquieria columnaris} and Cardon cactus {Pachycereus pringlei} nr Catavina, Desierto Central, Baja California, Mexico

Jack Dykinga / Boojum tree {Fouquieria / Idria columnaris} and Cardon cactus {Pachycereus pringlei} Baja California, Mexico

Jack Dykinga / Boojum tree {Fouquieria / Idria columnaris} and Cardon cactus {Pachycereus pringlei} silhouette at dawn with crescent moon, Catavinia, Baja California, Mexico

Jack Dykinga / Boojum tree {Fouquieria / Idria columnaris} flowering in front of Cardon cactus {Pachycereus pringlei} Catavinia, Baja California, Mexico

Rob Tilley / Ocotillo / Coachwhip / Jacob's Staff in flower (Fouquieria splendens) against the sky, Sonora Desert Museum, Tucson, Arizona, USA

Jack Dykinga / Solitary Saguaro cactus (Carnegiea gigantea)surrounded by Ocotillo (Fouquieria splendens) and other desert plants, Sierra Pinacate, Mexico

Jack Dykinga / Ocotillo (Fouquieria splendens) flowering with Teddy bear cholla (Opuntia bigelovii). Inactive lava flow in background, Biosphere Reserve of the Pinacate and Gran Desierto Altar, Mexico

Patricio Robles Gil / Ocotillo (Fouquieria splendens) and Brittlebush (Encelia californica), Sonoran Desert, El Pinacate/Gran Desierto de Altar Biosphere Reserve, Sonora, Mexico

Tim Fitzharris / Ocotillo (Fouquieria splendens) and other desert vegetation Anza-Borrego Desert State Park, California

Tui De Roy / Ocotillo (Fouquieria splendens) with a flush of green leaves after rain, Puerto Splendens, Baja California Peninsula, Mexico

Doug Wechsler / {Fouquieria} cactus covered in lichen as well as (Opuntia sp) cactus, in desert fog, Baja Magdelana plain, Mexico

Tim Fitzharris / Ocotillo (Fouquieria splendens), Borrego Palm Canyon, Anza-Borrego Desert State Park, California

Tom Vezo / Saguaro (Carnegiea gigantea) cactus, Ocotillo (Fouquieria splendens) Prickly Pear (Opuntia sp) cactus, and Cholla (Opuntia sp) cactus, Sonoran Desert, Tucson, Arizona

Konrad Wothe / Lucifer Hummingbird (Calothorax lucifer) female incubating eggs on nest in Ocotillo Cactus, Arizona

Konrad Wothe / Lucifer Hummingbird (Calothorax lucifer) female incubating eggs on nest in Ocotillo Cactus, Arizona

Konrad Wothe / Lucifer Hummingbird (Calothorax lucifer) female incubating eggs on nest in Ocotillo Cactus, Arizona