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                | Were using mostly herbarium specimens 
                              that have been collected from throughout the world 
                              over the last hundred years or so. Were extracting 
                              DNA from those samples in order to look at the whole 
                              genus to try to find out how many species are present, 
                              and whether or not the New World Species are closely 
                              related to the Old World species.Nancy 
                              Garwood, Botanist, Natural History Museum, London
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