Wish I'd pasted the link where I copied the info, I usually do, sorry for the omission. It was somewhere in Oxford dictionary but didn't show up again repeating the search I thought I did the other day.
Wiki does have a nice explanation:
http://en.wikipedia.org/wiki/N...
With any unknown plant, I never attach a cultivar name unless it's beyond dispute. Cultivars of ornamental plants are usually patented, so any name without a patent attached might not actually be a cultivar name, but a cutesy name attached by the grower or retailer.
http://en.wikipedia.org/wiki/C...
Donald, love your pics! My little guys want to look like that when they grow up!