Struggling to get your head around role of polyploidy in speciation, adaptive radiation and such like?
This page brings those concepts into focus using New Zealand examples.
http://sci.waikato.ac.nz/evolution/NZevidence.shtml

Check out the rest of the Evolution for Teaching site for  information on ‘Human Evolution’, `Darwin & Religion’, Earth’s History & Evolution’ and `Theories, Hypotheses, & Laws’.

A good authoratative site from University of Waikato with a links to glossary &  a useful FAQ page.