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Read how scientists have combined online databases with expert cross-checking to list the number of known plant species in the Amazon rainforests.

Scientists have for the first time a clear baseline figure for the number of plant species that grow in the vast lowland rainforests of the Amazon.

By painstakingly cross-checking data from botanical collections around the globe, the international team found that 14,003 seed plants, which include flowering plants and the palm-like cycads, have been recorded as growing in the forests.

The scientists discovered that fewer than half (just 6,797) of the plant species are trees, a number lower than suggested in previously published work. But herbs, shrubs and epiphytes - plants that grow on other plants - were more diverse than anticipated, showing they have often been overlooked in studies of tropical diversity...

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