Re: native North American aroids

In a message dated 12/09/1999 11:40:48 AM Eastern Standard Time, 
rmchatton@photocircuits.com writes:

<< Just to throw in my two-cents worth so to speak:  It is possible that 
 Pistia stratioides originated in Asia or Africa and migrated to South 
 America without the involvement of man.  >>

There is another scenario as well. If Pistia is ancient enough in its 
lineage, the species may predate the separation of Africa and South America. 
Much has changed over time including the reversal of the flow of the Amazon 
which used to flow into the Pacific!
    
    Jim Langhammer
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