“…These studies have shown that the two fruit or seed morphs may differ in mass (Sorensen, 1978;Venable and Levin, 1985a;Ruiz de Clavijo, 2001), shape (Baker and O'Dowd, 1982;Cordazzo, 2006), colour (Li et al, 2005;Wang et al, 2008) and presence/absence, length and density of the pappus (Venable and Levin, 1985a;Imbert et al, 1997;Brändel, 2007). Functionally, the two morphs may differ in dispersal mode and ability (Sorensen, 1978;Baker and O'Dowd, 1982;Ma et al, 2010), ability to persist in a seed bank (Philipupillai and Ungar, 1984;Venable and Levin, 1985b;Joley et al, 2003) and dormancy/germination characteristics (Venable and Levin, 1985a;El-Keblawy, 2003;Brändel, 2004).…”