Can someone help me how to show this on a cladic chart, and perhaps why such
breeding does not occur at the molecular level.
I don't know anything about cladic charts or what you mean by a molecular
level, but I can tell you breeding between species goes on all the time.


Iris,
Central NY, Zone 5a, Sunset Zone 40
"The trouble with people is not that they don't know but that they know so much
that ain't so."
Josh Billings (Henry Wheeler Shaw), 1818-1885