1. Arroyo MK, Marticorena C, Matthei O, Cavieres L (2000) Plant invasions in Chile: present patterns and future predictions. In: Mooney HA, Hobbs RJ (eds) Invasive species in a changing world. Island Press, Covelo, pp 385–421
2. Baker HG (1965) Characteristics and modes of origin of weeds. In: Baker HG, Stebbins GL (eds) The genetics of colonizing species. Academic Press, New York, pp 147–172
3. Baldwin BG, Goldman DH, Keil DJ, Patterson R, Rosatti TJ, Wilken DH (eds) (2012) The Jepson manual: vascular plants of California, 2nd edn. University of California Press, Berkeley
4. Cal-IPC (2006a) California invasive plant inventory. Cal-IPC Publication 2006–02. California Invasive Plant Council, Berkeley, CA
5. Cal-IPC (2006–2012) Centaurea melitensis (Malta starthistle, tocalote) statewide maps. http://www.cal-ipc.org/ip/mapping/statewide_maps/Centaurea_melitensis.php . Accessed October 6, 2011