Mimulus moschatus was introduced from North America in the early years of
the 19th centaury, and was strongly scented of Musk, then in the early part
of the last centaury it suddenly lost its scent, and it has never come back.
I wonder if the same thing happened to M.moschatus in North America.

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk