Vascular plant family diversity

This map shows the species richness of vascular plants, plotted as a world density surface. It is based on some 1400 literature records from different geographic units, with richness values as mapped calculated on a standard area of 10,000 km2 using a single species-area curve.
Source: Data and analysis © Wilhelm Barthlott (Botanic Institute and Botanic Gardens, University of Bonn). Reproduced by permission, with modification to colours. For further details see Barthlott and website http://www.botanik.uni-bonn.de/system/biomaps.htm#worldmap. (March 2002)
Barthlott, W. et al. 1999: Terminological and methodological aspects of the mapping and analysis of global biodiversity. Acta Botanica Fennica 162:103-110.