Flowering plant family diversity

Global diversity of flowering plants represented as a density surface derived from distribution maps for 284 non-aquatic plant families. Scale indicates number of families present, up to a maximum of 182, divided into 15 classes.
Source: compiled primarily from Heywood by UNEP-WCMC.
Heywood, V.H. (ed.). 1993. Flowering Plants of the World. B T Batsford Ltd, London.