chromosome count vs ploidy


Lately I've been adding information to the web database from the SIGNA 
Checklist of Iris Species.  Several of them (such as I. aphylla, I. 
croatica, I. cypriana) are listed as 2n=48.  Am I wrong in thinking this 
should be 4n=48 ?  Whenever I've seen tetraploid chromosome counts written 
it's always been with the 4n nomenclature.



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