It's Mimulus moschatus, and the loss of scent seems earlier than I thought. In the UK, one nursery had the monopoly, and themerchant abandoned the business after the scent loss in 1909, though French sources describe the scent upto 1916.

Apparently, no scented version has been found in the wild snce then, either. One site online suggests that the original strain was a sport, which reverted back when propagated from seed - which it would have been.

Odd.

Penny