Floral nectar chemical compositions of 29 species native to Argentinian Patagonia are reported. Most data obtained are new reports at the generic and/or the specific level. Their nectar has a high mean concentration ( ; %, wt/(total wt of solution)). Most of the species are hexose dominant (72.41 %) or hexose rich (17.24%), regardless of the floral syndrome or their systematic relatedness. A few are sucrose dominant (10.34%). The hexose ratio shows that in most species (86.20%) glucose predominates over fructose. The nectar of around 90% of the species has amino acids, whereas only in around 50% of them were lipids detected. Phenols are present in around 60% of the 48 samples analysed. All the species are entomophilous, mainly melittophilous.
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