Which Sage

Any ideas which Salvia this may be? The only clues I have are that it's in a garden of South American plants and that it's autumn-flowering. Thanks.

 

Solved this one. It's not a sage, but Plectranthus argentatus. Well, at least it was Lamiaceae.

 

Thank you! I saw this at the local conservatory yesterday, remembered that someone had posted it for ID, so I looked for a label but did not find one. I was a bit relieved, because had I learned the name, I would have had to figure out which was the posting with the question. It looked so familiar, I was sure it was something I've heard the name of, which is true.