Oh, yeah and there is a weird one I found out about natural hybrids recently.
Lets say there is a natural hybrid of A x B and that has been named C.
If
in the wild C crosses with A or C crosses with B then the result will still be called C
BUT if C is crossed with either A or B in cultivation then the result is given a new name and is NOT C.
This is because in the wild you have no chance of knowing how many times it has been 'back crossed' with one of it's parents so you can't give it a different name, however when a 'back cross' is done in cultivation you CAN know and record how many times it has been done so it must be recorded as such.
This means that a natural hybrid can range drastically from being almost idential to one parent, through a mix, to being almost identical to the other parent.
Anyway... getting really off topic here, good job the moderators (such as myself) are not too strict about that here, or I would have to tell myself off
Sorry for the digression.