I am not familiar at all with O. stacyi, but Guido made a very important point about stable natural hybrids and species....I feel that hybridization is a very definite factor in speciation...not frequently, but probably more often than is acknowledged...on the non-scientist, textbook level, isolation is always stressed as a factor in speciation...but, if, for whatever reasons, species come into contact and interbreed, creating stable hybrids, why shouldn't this lead to formation of a new species? The southern US is full of natural hybrid swarms of deciduous azaleas (Rhododendron). If a population of hybrids is in a position to interbreed with themselves, to the point where the traits become stable, why shouldn't they be then considered a species? Not that the species concept is clear cut anymore...I think that probably most scientists would agree that the concept of "species" must be far more flexible than used to be believed.....and is really more a term of convenience in many cases. By the way, even in animals, there are species that are clearly due to hybridization...in lizards, many species of Cnemidophorous are of hybrid origin (triploid and parthenogenic too!), as are several salamander species....Take care, Eric Muehlbauer in dry Queens NY...P. lowii in bloom, bellatulum album in bud.......
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