Rob Tilley / Pipiwai Trail through Bamboo (Poaceae) forest. Maui, Hawaii, February.

Rob Tilley / Rainbow Eucalyptus (Eucalyptus sp.) bark detail. Maui, Hawaii, February.

Rob Tilley / King Protea (Protea cynaroides) bud close-up detail. Maui, Hawaii, February.

Rob Tilley / Agave (Agave sp.) leaf close-up detail. Maui, Hawaii, February.

Rob Tilley / Detail of plumage of Great White Egret / Heron (Ardea herodia occidentalis). Ding Darling Reserve, Florida, January.

Rob Tilley / Aphelandra (Acanthus sp) flowering. Oahu, Hawaii, February.

Rob Tilley / River of lava flowing from the Pacaya volcano, Los Pocitos, Guatemala, Central America, June 2010

Rob Tilley / Agave close up abstract (Agave sp) Botanical Garden, San Miguel de Allende, Mexico

Rob Tilley / Close up of Agave leaves (Agave macroacantha)Botanical Garden, San Miguel de Allende, Mexico

Rob Tilley / Detail of leaf of Cabbage Palmetto (Sabal palmetto) Sanibel Island, Florida, USA

Rob Tilley / White sand dunes against blue sky, White Sands National Park, New Mexico, USA, February 2009

Rob Tilley / White sand dunes against blue sky, White Sands National Park, New Mexico, USA, February 2009