Iris pseudacorus 'Sulphur Queen' VS 'Bastardii'

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Hello to everybody, I'm Roberto from Italy.

Is Iris pseudacorus
'Sulphur Queen' a synonymous of I. pseudacorus 'Bastardii', or are two
different cultivar?

In case, someone knows the registration data of
'Sulphur Queen'?

I found opposite informations on the web.

Thank you.

Roberto

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