STEVE ALLEN / SCIENCE PHOTO LIBRARY STEVE ALLEN / SCIENCE PHOTO LIBRARY
Lava cacti (Brachycereus nesioticus). This cactus is endemic to the Galapagos island of Bartolome, where it grows on lava fields. It has soft spines and grows up to 60 centimetres in height. New growth is yellow, turning to brown and then grey. Photographed on the Galapagos Islands.
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