CARADON?

This iris flowered for the first time here in 2018 and does seem to match the descriptions. As there is little provenance, I can only guess that it might be right.

Grace Sturtevant x ?  (?... sister to GS?)       TB-Mla-S6D (AIS Checklist 1939)

With its clouded yellow standards and the rich depth of Grace Sturtevant in the fall should prove a rival for Bruno as it is even a richer bronze of the Dominion race. (RS Sturtevant; AIS Bull. No 43)