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

Thanks to everyone for all the information.
So, to sum it all up, so far.
1)Iris setosa has 2n=38.

2)Most people would probably agree that I.tridentata is a distinct 
species. It may have some relation to the Louisiana iris species. It 
may or may not hybridize with setosa. But having 2n=40, the offspring 
might have fertility problems. Consider: "the Hexagonae species have 
chromosome counts that vary little--from 2n=42 for I. fulva and I. 
nelsonii to 2n=44 for I. brevicaulis, I. giganticaerulea, and I. 
hexagona." -(from Society for Louisiana Irises webpage @ 
http://sliris.bizland.com/aboutsli/history1.html)

3)Iris hookeri should probably be considered a separate species in 
spite of gross morphological similarity to setosa, because studies 
have shown it to have "very distinct chemical differences." I'm 
guessing it will cross with setosa rather easily??

4)As for Iris setosa throughout the western North American and Asian 
range, distinct groups probably exist. These may be interfertile but 
probably are being kept somewhat separated by geography and habitat 
preferences. For example: visit this site about two forms of setosa 
in Alaska (http://www.alaska.edu/opa/eInfo/index.xml?StoryID=105).

Do the western Northern American I.setosa and the eastern I.hookeri 
overlap ranges in the middle? Has anyone ever hybridized setosa with 
Louisiana irises?



 
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