If you go to the RHS Plantfinder
http://apps.rhs.org.uk/rhsplantfinder
and type Betsy into the Search box then you will find several suggestions.

I have heard of a shrub called
Sweet Shrub; Sweet Betsy, Carolina allspice.....
Scientific Name..... (Calycanthus floridus)
I looked it up and found it on www.burncoose.co.uk
Jackie :o)

Thanks Jackie but can't find the Betsy plant on the website!! Thanks anyway..

Thanks Bulbaholic!! Will have a look now..