Status of I. klattii?

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One of the donors to the HIPS rhizome sale is offering
I. klattii. I don't see it on the list of species on
the SIGNA web site - is it considered a sub-species
of I. spuria, or has the name been superseded?

Thanks,

Jean Richter
San Francisco bay area, zone 9
(where the weatherman has finally promised rain)