Celtis reticulata was one of the species analyzed in a pollen core samplng study in northern Arizona, in which the early to late Holocene flora association was reconstructed; this study in the Waterman Mountains-(Pima County-S.East AZ) demonstrated that C. reticulata was found to be present after the Wisconsinan glaciation, but is not a current taxon of this former Pinyon-juniper woodland area which is now in central and northern Arizona.