Aroid breeding problems

**B* W* <p*@alltel.net>**

I have been working on breeding aroids for many years now. I have found 
a few species that show some very interesting traits that I am looking 
to work with. These aroids are self fertile but if I add pollen from a 
different similar species it never takes. I remember having similar 
problems with Amorphophallus bulbifer. What is the cause of this and why 
is the pollen unable to take? It really does not make much sense to me 
sense the plant is fertile and able to receive it's own pollen. I would 
think that a similar species would easily cross with it. Is their any 
way around this barricade?
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