Ken,
If it was patented, that means it was cloned. I would not trust that it is a division of the original awarded plant.
Stewart got the award in 1977. It was later awarded an FCC in 1981 then two CCMs in 2014 (presumably from divisions or clones).
It was patented in 1982 not in 1970. It was registered with RHS in 1970.
http://www.google.com/patents/...
Now that is not to say it would not be a good plant to own, but I would not trust that it is a division from the original without some hard documentation. You can buy the clone for under $30.
http://fatinoinc.com/10694-Blc...
