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Re: another UP iris

 

Yep, I think it's Iris ×robusta. I purposely went looking for them at the locations Anderson mentions in his 1928 paper describing the hybrid. That particular plant has the exserted ovaries and short, sturdy standards of versicolor, but the longer ovaries, pubescent, bright yellow signal and wide, obovate-spatulate standards of virginica, among other mixed characters. Here are some photos of more plants from the same site.


Anderson didn't consider them easy to identify:

Though admittedly difficult, if not impossible, to distinguish by means of ordinary herbarium material, the hybrid appears of sufficiently common occurrence to warrent a special name.

× Iris robusta E. Anderson, new hybrid
(Iris versicolor × I. virginica)
Intermediate between Iris versicolor and I. virginica, but more robust; partially sterile.

Sean Z
Zone 6a
SE Michigan 



On Tue, Jul 9, 2013 at 11:48 AM, Mark A. Cook <b*@bellsouth.net> wrote:
 

>Some say that Iris virginica has hairs, I. versicolor dies not.
 
Rick Sean,
      Shown here is my best photo of Iris virginica.  Scroll in on it and see what you think.  Also, I checked out the natural distribution of Iris virginica.  Here is the map for Michigan:  http://plants.usda.gov/java/county?state_name=Michigan&statefips=26&symbol=IRVI     It is definitely found in the counties shaded in green, and it almost certainly is found in some of the “white” counties as well, but has yet to be “vouchered” there yet.  I have a feeling your plant is some sort of Iris virginica.  Something I wonder is that in areas where Iris virginica and Iris versicolor are both found, is there any possibility that there are some natural hybrids of the two growing wild?
 
Mark A. Cook
b*@bellsouth.net
Dunnellon, Florida. 


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