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Honeys from Prosopis spp. (U. S. and Mexican mesquite), and Acacia spp. (catsclaw, huajillo) are shown to have stable carbon isotope ratio values ranging from ca. -21 to -23-degrees/ infinity, significantly less negative than the average of nearly all other honey types. Quantitative pollen analysis has been used to identify floral sources; several published identifications based on producer estimates are found to be erroneous.