Porqueddu et al., 2006. Pastos, 36 (2): 125-142 Document reference Porqueddu, C.; González, F., 2006. Role and potential of annual pasture legumes in mediterranean farming systems. Pastos, 36 (2): 125-142Web http://polired.upm.es/index.php/pastos/article/view/1469Citation key Porqueddu et al., 2006Datasheets Bur clover (Medicago polymorpha)