Floral nectar chemical compositions of 28 species native to Argentinian Patagonia are reported. Most data obtained are new reports at the generic and/or the specific level. Nectars of these species show high mean concentrations (42.35±15.56; %, wt/total wt of solution). Most of the species are hexose dominant (68%) and the remaining are sucrose rich (11%) or sucrose dominant (21%). The hexose ratio shows that in most species (71%) glucose predominates over fructose. The nectars of all species have amino acids. In 32% of them, lipids were detected, whereas phenols were present in around 60%. Most of the species are entomophilous, mainly melittophilous and psychophilous. These data together with those of our previous report include a total of 57 species from 19 families, and suggest three trends in the nectar sugar traits of Patagonian plants, regardless of their systematic relationship or floral syndrome: high concentration, hexose dominance, and predominance of glucose. These results suggest that nectar characteristics are not always as similar for plants pollinated by the same animal taxa as formerly thought.