Iris kaempferi mandschurica

I wonder if someone could tell which iris this name once referred to.  It is in an quite an older book written for plants for the prairies.  In it, it states that the species kaempferi is not hardy on the prairies, but the variety? can be grown given suitable conditions.  I assume this refers to the species ensata, but variety mandshurica?
Any help would be appreciated.
Thanks, Jim in Saskatoon

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