A relative of Calycanthus that you are unlikely to casually stumble upon is this one from China: Sinocalycanthus chinensis known as Chinese sweetshrub. It's a clunky and coarse looking thing with a flower that looks like a fried egg. IMHO, it looks better in pictures than in real life. I had to swat a million mosquitoes to take this picture in my garden before I set off to work. Every time this shrub gets greedy for space, I cut it right back to the ground, and it keeps coming back for more.