By Mark Kinver Environment reporter, BBC News
Image copyright Craig Hilton-Taylor
Although cacti are now found worldwide, all but one species’ natural range is limited to the Americas
Almost one-third of cactus species are under threat as a result of over-harvesting and illegal trade in the plants, a global study has concluded.
Conservationists voiced concern, saying the level of threat to cacti was much greater than previously thought.
The plants are a vital component of arid ecosystems, providing a source of food and water for many animals. Read more.