Drought tolerant in brutal Australian summers, country QLD. Throws out long arching canes to 1m. Fades to lavender colours.

From a UK PBR publication:

"HARBAROQUE, BAROQUE FLOORSHOW, 10-FEB-97, 6560"
(Approved variety name, Marketing name, date PBR granted, grant number)

Source: http://www.fera.defra.gov.uk/plants/publications/documents/specialIssue.pdf

If there is, or has been, a PBR granted it might be possible to find the original PBR application to see if parentage is listed. Unfortunately I have not found a way to search the UK PBR applications to find this information.