Jack Dykinga / Sand dunes with cracked clay marking the last flash flood, Creosote bushes (Larrea tridentata) flowering in the background, Mosquito Flats, Death Valley National Park, California, USA

Philippe Clement / Devil's thorn (Tribulus zeyheri) the Kalahari desert's prominent creeper, appearing after the rains, Kgalagadi NP, South Africa

Jabruson / 'Boko' tree trunk (Balanites wilsoniana), lots of the tropical rainforest fauna enjoy the fruits and seeds of this species, including elephants and bush pigs, who help seed dispersal. Ba'Aka tribal pe...

Jabruson / 'Boko' tree trunk (Balanites wilsoniana), lots of the tropical rainforest fauna enjoy the fruits and seeds of this species, including elephants and bush pigs, who help seed dispersal. Ba'Aka tribal pe...

Hanne & Jens Eriksen / Frankincense tree (Boswellia sacra)flowers, Oman, April

Murray Cooper / Palo Santo (Bursera graveolens) trees along coast, Rabida Island, Galapagos Islands, Ecuador

Pete Oxford / Palo Santo (Bursera graveolens) tree growing in the arid zone of Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Palo Santo (Bursera graveolens) trees growing in the arid zone of Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Palo Santo (Bursera graveolens) trees, Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Manzanillo (Hippomane mancinella) and Palo Santo (Bursera graveolens) trees growing on cool lava field, Santiago Island, Galapagos Islands, Ecuador

Scott Leslie / Gumbo Limbo (Bursera simaruba) trees surround Gumbo Limbo Trail, Everglades National Park, Florida

Jouan & Rius / Devil thorn flowers (Tribulus terrestris) after the rains, Kgalagadi Transfrontier Park, Kalahari desert, South Africa

Jouan & Rius / Carpet of Devil thorn flowers (Tribulus terrestris) and other flowers during the rainy season, Namaqualand, South Africa

Jouan & Rius / Skeleton of a dead Canarium (Burseraceae) leaf on the ground, tropical rainforest, Masoala NP, Madagascar

Jack Dykinga / Servilletta Canyon's walls with Gumbo Limbo (Bursera simaruba) trees, bromeliads (Bromeliad sp), agaves (Agave sp) and Prickly pear cacti (Opuntia sp). Tamaulipas, Mexico

Tim Laman / Aerial view of Palo Santo trees (Bursera graveolans) on Isabala Island, Galapagos. June 1993.

Jouan & Rius / Carpet of Devil thorn flowers (Tribulus terrestris) and other flowers during the rainy season, Namaqualand, South Africa

Jouan & Rius / Young Canarium (Burseraceae) shoot, tropical rainforest, Masoala NP, Madagascar

Jack Dykinga / Close up of the curled bark of a Gumbo limbo tree (Bursera simaruba), El Cielo foothills, Tamaulipas, Mexico

Tui De Roy / Palo Santo (Bursera graveolens) forest bisected by young lava flow, Pinta Island, Galapagos Islands, Ecuador

Pete Oxford / Palo santo trees (Bursera galapageia) Floreana Island, Galapagos Islands, South America

Jack Dykinga / Creosote bushes (Larrea tridentata) in-amongst Desert Trumpets (Eriogonum trichopes) Panamint Valley, Death Valley National Park, California

Jack Dykinga / Creosote bushes (Larrea tridentata) in-amongst Desert Trumpets (Eriogonum trichopes) Panamint Valley, Death Valley National Park, California

Patricio Robles Gil / Elephant Tree (Bursera microphylla) on hillside, Las V?rgenes Volcano, El Vizca?no Biosphere Reserve, Baja California, Mexico

Pete Oxford / Palo Santo (Bursera graveolens) tree ringed bay with tourists, Floreana Island, Galapagos Islands, Ecuador

Pete Oxford / Palo Santo (Bursera graveolens) trees and Mangroves (Avicennia sp) in bay surround cinder cone, Floreana Island, Galapagos Islands, Ecuador

Pete Oxford / Palo Santo (Bursera graveolens) trees growing in arid landscape, Floreana Island, Galapagos Islands, Ecuador

Pete Oxford / Palo Santo (Bursera graveolens) trees growing in arid landscape, Floreana Island, Galapagos Islands, Ecuador

Pete Oxford / Palo Santo (Bursera graveolens) trees growing in rugged, arid landscape, Floreana Island, Galapagos Islands, Ecuador

Tui De Roy / Red-footed Booby (Sula sula) perching in Palo Santo Tree (Bursera graveolens) nest site, Genovesa Island, Galapagos Islands, Ecuador

Tui De Roy / Elephant Tree (Bursera microphylla), Baja California, Mexico

Pete Oxford / Devil's thorn in flower {Tribulus terrestris} Sossusvlei, Namib desert, Namibia

Luiz Claudio Marigo / Desert date tree {Balanites aegytiaca} Masai mara GR, Kenya

Mark Moffett / Flea Beetle (Diamphidia nigroornata) feeding on Myrrh Tree (Commiphora sp) larvae produce a toxin not found in adults which is used by Kalahari Bushmen as a poison, Namibia

Mark Moffett / Palo Santo (Bursera graveolens) trees along coastline, Floreana Islands, Galapagos Islands, Ecuador

Tui De Roy / Swift river of lava flows past old stand of trees on previously vegetated cone, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) with chick amongst leafless trees (Bursera sp) in dry season, Seymour Island, Galapagos Islands, Ecuador

Tui De Roy / Lava flowing around previously vegetated shield volcano flank scalding trees, February 1995, Fernandina Island, Galapagos Islands, Ecuador

Michael & Patricia Fogden / Gumbo Limbo (Bursera simaruba) bark peeling off trunk, Palo Verde National Park, Costa Rica

Christian Ziegler / Bursera Tree (Protium sp) leaves with insect damage, Barro Colorado Island, Panama

Tui De Roy / Volcanic eruption February 1995 a swift river of lava runs past old stand of trees on previously vegetated cone, Fernandina Island, Galapagos Islands, Ecuador

Mark Moffett / Ant (Pseudomyrmex sp) biologist Doug Yu plucks ants from Palo Santo (Triplaris sp) tree whose base cleared of vegetation by the ants, Peru