All I can do is add more confusion for you.
There is a group of biologists who want to throw
out all the Latin nomenclature of Genus species,
etc., and group all organisms into something
called Clades. Every 'species' would have its own
number. Some biologists are of course unhappy
with the whole idea of replacing names with
numbers. So the taxonomy communities are in an
even greater state of flux now with the incredible
amounts of new info flowing in from DNA sequences,
which often throws off the old ideas of who was
related to whom.
I was shocked to discover in Weeds of the West
that many of the plant family names I had learned
in the 60's have been changed to new names. We
will keep getting new info about genetic
relationships for a long time still. So I think
you can just learn what the textbook says and
remember that we're still far from sure how
classifications will end up.
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