A Pleistocene Clone of Palmer's Oak Persisting in Southern California May, Michael R. ; Provance, Mitchell C. ; Sanders, Andrew C. ; Ellstrand, Norman C. ; Ross-Ibarra, Jeffrey Abstract Publication: PLoS ONE Pub Date: December 2009 DOI: 10.1371/journal.pone.0008346 Bibcode: 2009PLoSO...4.8346M