Dear Fred, If Cameron and Rhoda are having the time to read these posts they can better answer your first question about variations in this plant. As for the book, unless someone from South Africa can answer for me Rod and Rachel are gone for several weeks so can't respond. The book was in their private library. Rod told me he had a resource and then we just never had time to look it up. Finally towards the end of our trip I reminded him and we went to their office and he found the book for me. I just had a short time to sit on the floor and write down the information since we were heading out. I am remiss in not writing down the resource which I certainly should have. I think the book is out of print. So unless someone else responds we'll have to wait to ask until they get back. Mary Sue