News Plants Earth may have 9,200 more tree species than previously thought More than a third are probably hiding out in South America, researchers say Earth may be home to around 73,000 different kinds of trees, new research suggests. Many undetected tree species are probably hiding out in the Amazon (shown) and other biodiversity hot spots in South America, researchers say. Ricardo Lima/Moment/Getty Images Plus Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Jude Coleman February 7, 2022 at 9:00 am Trillions of trees are growing on Earth, though how many kinds there are has been underestimated, a new study finds.Earth