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

Juergen Freund / Aerial of Kri Island, Kri Eco Resort and Sorido Bay Resort. Raja Ampat, West Papua, Indonesia, February 2010

Tim Laman / Aerial view of Bora Bora Island, Society Islands, French Polynesia. July 2006

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,...

Jack Dykinga / Mulesears (Wyethia sp) flowers at dawn. on the hillsides in Coral Pink Dunes State Park, Utah, USA.

Jack Dykinga / Mulesears (Wyethia sp) at dawn flowering on hillsides in Coral Pink Dunes State Park, Utah, USA.

Alex Mustard / Rich coral growth, with a pair of Exquiste butterflyfish (Chaetodon austriacus), flourishes beneath the barren desert cliffs in the Red Sea. Taken at sunset. Ras Katy, Sinai, Egypt. Gulf of Aqaba, Red...

RHONDA KLEVANSKY / Coral crassula (Crassula corallina) Richtersveld National Park and World Heritage Site, Northern Cape, South Africa, August.

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

Tim Fitzharris / Sand dunes, Coral Pink Sand Dunes State Park, Utah