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Apart from the difference between a taxonomist and the geneticist in 
defining a hybrid, there seems to be another difference in defining a hybrid 

1. a hybrid is the result of  any cross ( that way also any offspring of 
ventricosa are hybrids or seedlings due to nonreduced eggs etc).
I prefer the following:
2. a hybrid is the offspring of two parents that can be shown, one way 
or another, to have characters of  both parents.
If hybrid A x hybrid B >  A then the latter is a hybrid 
according to definition 1.,  but not according to definition 2 because it 
is not a mix of the two parents. 
A x B >>A maybe rare in animals (some fishes do it that way!), but is not rare in plants.
Ben J.M.Zonneveld
Clusius lab pobox 9505
2300 RA Leiden
The Netherlands
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