Scientists have estimated that there are 390,900 plants known to science.
The new tally is part of a report carried out by the Royal Botanic Gardens, Kew. It is its first global assessment of the world's flora.
The study also found that 2,034 new plant species were discovered in 2015.
However, the report warns that 21% of plants are at risk of extinction, with threats including climate change, habitat loss, disease and invasive species.
BBC: Kew report makes new tally for number of world's plants
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