1915, Van Tubergen
'Bianca' (C. G Van Tubergen, before registration). Regeliocyclus. AR. Medium blue bitone. I. korolkowii- var. concolor X _I. iberica. Van Tubergen, 1915.
A tall bearded Iris was registered in the 1939 checklist with this name, that was offered by Millet in 1912 just prior to the time that Van Tubergen was using this name for this Regeliocyclus. See tall bearded 'Bianca'.
See below:
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