Popay, 2014. Invasive species compendium, CABI Document reference Popay, I., 2014. Medicago polymorpha (bur clover). Invasive species compendium, CABIWeb http://www.cabi.org/isc/datasheet/33031#20117201824Citation key Popay, 2014Datasheets Bur clover (Medicago polymorpha)
