We've all heard about the most endangered animals. Creatures like the critically endangered black rhinoceros are famous, and in some cases have been reduced to just a handful of individuals. But what are the most endangered plants? They might not be as exciting or loveable as animals, but they are just as important to the ecosystem – and humanity relies on that ecosystem. Here are nine of the most threatened plants today. They are almost all classed as critically endangered by the International Union for Conservation of Nature (IUCN). These plants occupy some of the most inaccessible, remote parts of our planet. They are threatened by habitat destruction, illegal collection, poaching, and competition with invading species. Attenborough's pitcher plant (Nepenthes attenboroughii) Attenborough's pitcher plant is known only from the relatively inaccessible summit of Mount Victoria in Palawan in the Philippines. There are thought to be only a few hundred of them. Pitcher plants are carnivorous plants that trap animals in liquid-filled bowls called pitchers. Attenborough's pitcher plant is one of the biggest, with pitchers up to 30cm in height that can trap insects and rats. It was only discovered in 2007 when a team of botanists, tipped off by two Christian missionaries, scaled Mount Victoria. It is named after British natural history broadcaster David Attenborough.