Almost 600 plant species have been lost from the wild in the last 250 years, according to a comprehensive study.
The number is based on actual extinctions rather than estimates, and is twice that of all bird, mammal and amphibian extinctions combined.
Scientists say plant extinction is occurring up to 500 times faster than what would be expected naturally.
In May, a UN report estimated that one million animal and plant species were threatened with extinction.
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