border debates
Fierycloud (Thu, 25 Mar 2010 21:28:25 PDT)
Hello:
I think the hisrotical geology and climate also affected it.
http://www.scotese.com/paleocli.htm
http://en.wikipedia.org/wiki/Floristic_province/
The high lands in the tropical america may help some species to move. the
border is a filter.
And why not is the flora of tropical america stops at Mexco -USA border?
Because we are in a warming Interglacial.
Fierycloud
Taiwan.
----- Original Message -----
From: Alani Davis <alanidae@gmail.com>
To: Pacific Bulb Society <pbs@lists.ibiblio.org>
Date: Thu, 25 Mar 2010 17:22:23 -0400
Subject: [pbs] border debates
"The Flora of North America seems to stop at the Mexico-USA border.
Where are all our experts when you need one?"
Which part of the North American flora stops at the Mexican United States?
There are many genera that bridge that artificial line. Oaks, pines,
maples,
magnolias, Mahonia, all occur on both sides and in some cases the same
species and there are plenty of others that don't range widely in the
northern United States but occur throughout the southeast and southwest
U.S.
If I have the correct greatest diversity of Pinus and Quercus species in
the
world is found in Mexico. Another interesting twist, the cycad genus,
*Ceratozamia
*represented by several species in Mexico, Guatemala, and Belize is
represent in fossil form from Alaska. Seems to me there is a fair amount
of
moving around.
Alani Davis
--
Alani
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