Looks like one of the integrifolias.

I grew a similar one from seed...also around 20 years ago - integrifolia 'Blue Ribbons'. Does that sound familiar, SB?. Mine never got taller than 2 feet tall, but had exactly the same twisted sepals.

Does not ring a bell Rosa. one of these days I'll dig up the

spreadsheet.

Oh man, it is beautiful.

All of the species integrifolias are blue and have twisted sepals :-) It is only when they are part of a hybrid (Arabella, Rooguchi, etc) that they lose these specific characteristics.