Constantinos Petrinos / Giant Lobelia (Lobelia rhynchopetalum) Simien Mountains National Park, Amhara Region, Ethiopia, Africa, March 2009.

Lucas Bustamante / Ceiba / Kapok tree (Ceiba pentandra) buttress roots, Yasuni National Park, Orellana, Ecuador.

Lucas Bustamante / Aerial view of Kapok / Ceiba tree (Ceiba pentandra) in the Amazonian canopy, Yasuni National Park, Orellana, Ecuador.

Michel Roggo / Horsetails (Equisetum) Jiuzhaigou National Park, Jiuzhaigou Valley Scenic and Historic Interest Area UNESCO World Heritage Site, Sichuan, China. May 2013. Photographed for The Freshwater Project

Cheryl-Samantha Owen / Dead thorn tree (Vachellia tortilis) silhouetted against the moonlight, Amboseli conservancy next to Amboseli National Park, Kenya

Cheryl-Samantha Owen / Umbrella thorn tree (Vachellia tortilis) alive tree and dead tree, Amboseli National Park, Kenya.

Cheryl-Samantha Owen / Herd of African buffalo (Syncerus caffer) standing under Baobab tree (Adansonia digitata), Tarangire National Park, Tanzania.

Enrique Lopez-Tapia / Augur buzzard (Buteo rufofuscus) perched on a giant lobelia (Lobelia rhynchopetalum), in the mist. Sanetti Plateau, Bale Mountains National Park. Ethiopia, November 2014

Enrique Lopez-Tapia / Giant lobelias (Lobelia rhynchopetalum) in mist, Sanetti Plateau, Bale Mountains National Park. Ethiopia, November 2014

Enrique Lopez-Tapia / Giant lobelia (Lobelia rhynchopetalum) close up of leaves against white background, Sanetti Plateau, Bale Mountains National Park. Ethiopia, November 2014

Enrique Lopez-Tapia / Giant lobelia (Lobelia rhynchopetalum) leaves, Sanetti Plateau, Bale Mountains National Park. Ethiopia, November 2014

Enrique Lopez-Tapia / Giant lobelias (Lobelia rhynchopetalum) Sanetti Plateau, Bale Mountains National Park. Ethiopia, November 2014