Key leaf traits describing their structure, chemistry and metabolism. Data include measurements repeated at contrasting seasons between year 2010 and 2014 across seven sites (Alice Mulga, Calperum Mallee, Cumberland Plain, Cape Tribulation, Robson Creek, Great Western Woodland, and Warra). The plants measured were selected to include locally dominant species and to provide a wide range of leaf morphology. Leaf samples and measurements were focused in the main plot around each site's OzFlux tower.