Looks like setosa to me, too. Sean has listed many of the traits that converge in the setosa gestalt.
One could say, OK, at a certain level of abstraction, tridentata and setosa may look similar. Both have very reduced, narrow, pointed petals. Those of setosa have a seta, or small bristle, at the tip, but it is often hard to see. There’s a lot of variation.
Then the deal-breaker could be the rhizomes. Tridentata has unique, stolon-like cords between rhizomes; setosa’s rhizomes merely branch; and they are thick and chaffy.
On the SIGNA site are some excellent photos by Ken Walker of tridentata, including its roots http://www.signa.org/index.pl?Iris-tridentata
On the website of Gabi & Jochen Wegner, photos of the roots of setosa are here http://www.wildstaudenzauber.de/Stauden/iris_setosa.htm
Hope this is useful.
Paige Woodward
> On Aug 9, 2016, at 6:44 AM, Sean Zera zera@umich.edu [iris-species] <iris-species@yahoogroups.com> wrote:
>
>
> I would say setosa. The veining pattern, signal shape and style arms don't look like tridentata to me. Tridentata has that weird pattern of a bunch of fine veins running parallel and not branching much.
>
> Sean Z
>
> On Tue, Aug 9, 2016 at 9:11 AM, 'Will Plotner' gardens@molalla.net [iris-species] <iris-species@yahoogroups.com> wrote:
>
>
> Looks more like Iris Tridentata
>
> All My Best
>
> Will
>
> From: mailto:iris-species@yahoogroups.com
> Sent: Tuesday, August 09, 2016 4:38 AM
> To: yahoogroups
> Subject: [iris-species] Iris Identification Request [1 Attachment]
>
>
>
>
>
> Hi all,
>
> A SIGNA member asked me to ID this. It looks like setosa to me but I wasn't sure about the apparent branching.
>
> Rod
>
>
>
>
>
