One of the interesting botanical facts about rare plants is their genetic  
adaptation to particular soil chemistry. I worked with botanists who  
demonstrated variations in Endangered Species often were directly linked to the  
particular chemistry of Gabroic soils in our back country. The introduction by  cross 
pollenation or some similar process of closely related exotic species can  
override those special adaptations and produce really crazy results. Thus, I can 
 easily see the native cane marrying with a European species and creating a  
hybrid that infests much of the nation, killing its ancestral species off in 
the  process. By analogy, we might have done that to the Neanderthals.
 
Ron May
Legacy 106, Inc.