| Analysis of the list |
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Estimates for the global number of vascular plant species commonly range
from 250,000-270,000. In this book, analyses are made against the estimate
of 270,000 thereby under- rather than over-estimating the figure for percent
species threatened. Figures for the number of genera per family are mainly
taken from Brummitt (1992) or from Cronquist
(1991). Figures for number of species per genus and number of species
per country are taken from a wide range of sources whose data sources were
not able to be shown in this list. Undoubtedly, there may be other, equally
or more valid, estimates for many of these figures.
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