FILE - In this Oct. 8, 2010 file photo, people walk amongst trees shedding their leaves and changing to seasonal autumnal colors at the Royal Botanic Gardens, Kew, in London. U.S. and British scientists have drawn up a list of all the world's known land plants - a 300,000-species strong compendium which they say will boost conservation and help regulate trade and medicine. (AP Photo/Matt Dunham, File)
Featured Photo Galleries
