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

Tom,
         Tridentata is easy to tell apart from setosa & hookerii.  It 
blooms about a month later, in mid July here in central NY (USDA 5), and it 
is stoloniferous.  Even without digging it up, you can tell it apart by the 
form of the bloom, once you have seen it.  I can't describe the differences 
without having either the plant or a good photo in front of me, but it's 
not hard.
         Here tridentata grows but not all that well. I think it wants more 
water than I'm able to give it.
         Hookerii will cross with setosa, I'm sure.  There may not be 
hybrids registered as such, because they were considered the same 
species.  A couple of years ago Tony Huber donated some seed to the SIGNA 
exchange labeled 'Pointe Riche X Innu Spring', which I am growing, although 
it has not bloomed yet.  That represents hookerii x one of the Alaskan 
varieties.
         Ken
At 12:27 PM 2/26/2004 +0000, you wrote:
>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?
>
>
>
>
>Yahoo! Groups Links
>
>
>
>






 
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