R. X hibernica a repeating hexaploid?

While looking for R. foliolosa I came across an extract from “the book of roses 1838” detailing an Irish species, R. hibernica (aparently hexaploid ((42 chromosomes)) which is said to flower from early June to mid November its also said to resemdle R spinosissima in poor soils and R canina on loam.

I’d like to know more, would Anyone have experiance of growing, or working with R. hibernica?

I’d also be intrested to know of any other hexaploid’s that repeat.