Mystery spuria species

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The attached pictures were first identified as
I. spuria subsp. carthaliniae, but then the owner
changed her mind and said they were I. klattii,
which as far as I can tell isn't a currently
recognized species - what's its current status?
The pictures of klattii I was able to find on
the internet are blue rather than white.

Any thoughts as to what these iris actually are?

Thanks,

Jean