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Last Updated: Wednesday September 29 2010 17:03 GMT

A fifth of world's plants under threat of extinction

Ricky at Kew Gardens, reporting on the story that some of the world's plants could become extinct

Ricky finds out why plants are so important

One out of five plants around the world is under threat of becoming extinct, according to a new study.

A team of researchers led by Kew Gardens looked at thousands of different plants species - from flowers and grasses to mosses and ferns.

They found that plants in the tropical rainforests are the most under threat and the biggest risk to plants is from humans destroying their habitat.

It's thought there are around 380,000 species of plants in the world.

Professor Stephen Hopper from Kew Gardens said: "We cannot sit back and watch plant species disappear - plants are the basis of all life on earth, providing clean air, water, food and fuel.

"All animal and bird life depends on them and so do we."