Diversity summary statistics, classification, ordination and
statistical tests were conducted using EstimateS 8.0 (Colwell,
2006), PC-ORD 5.0 for Windows (McCune and Mefford, 1999) and
SPSS 15.0 for Windows (SPSS Inc., Chicago, IL). Plant nomenclature
follows the International Plant Names Index (www.ipni.org).