setosa, hookeri, tridentata, var. canandensis and var. arctica

setosa, hookeri, tridentata, var. canandensis and var. arctica

Could someone shed some light on the current taxonomic view of these 
irises? For instance, I seem to remember something about I. 
tridentata once being considered a geographically isolated population 
of setosa? And that the northeastern North American population of 
setosa, used to be called I.setosa var. canadensis, but is now maybe 
considered separate enough to be called I. hookeri. Does the 
population of setosa form a continuum, (from Asia through western 
North America to eastern North America) which grades from one type 
into another? Or are there discrete blocks of the types? And what are 
the distinguishing features of the types? For example, how would you 
tell a tridentata from a hookeri from a setosa var arctica? 

I'm mostly wondering how varied the setosa clan is and how 
interfertile these various members are? And are they all 2n=38?



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