It is one of those plants which has a history of providing interesting alternative medicines, offering cures for cancer, anxiety, influenza, the common cold, bacterial infections, and migraines. It is also used as an antidepressant. Its root is reported to contain some 140 different chemicals, so it's almost bound to be good for something.
Despite stern warnings against its use from august bodies such as the U.S. Food and Drug Administration, The Diary is very interested in it as, in one experiment, R. rosea extract was found to increase the life span of fruit flies by 24%.
The picture comes from Kilchoan Early Bird who found it near the lighthouse.
Many thanks to Kilchoan Early Bird for the picture.