Cladograms (1)

1 Name: Anonymous Scientist : 2009-04-28 00:59 ID:NPdkHP4N

http://upload.wikimedia.org/wikipedia/commons/0/03/Clade_types.png

I get that A B and Z are species, but what do the intersections, base and stems represent?

I thought I knew, now I just don't get it
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