Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The relationship between the number of families in a plot and cumulative evolutionary age (CEA) for (a) fynbos, (b) grassland, (c) thicket and (d) karoo. The upper and lower lines are the minimum and maximum CEA for a given number of families; the middle line is the median CEA, and the dotted lines are the 95% confidence intervals, calculated by randomly sampling the complete family list. Karoo data (fewer families) are plotted on a different scale.
