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.
For example, in the Late Wisconsin period, this species occurred at lower elevations within the Waterman Mountains in southern Arizona than currently found.
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The species has been confirmed to have been native to northern Arizona since at least the Late Wisconsin late glacial period based upon pollen core analysis at the Waterman Mountains (Coconino County) - (not the Waterman Mountains of Pima County); dominant trees of Juniperus osteosperma and Pinus monophylla remain extant species to the present time in this predominantly Pinyon-juniper woodland.