how to remove a directory name '-e'?

Question

I have in a folder several empty directories named '-e' or '-v' and so on.. I don't know how those directories were made. This makes the command ls -ltrd * do not work. How can I remove those directories? I tried \rm -r -e and \rm -r '\-e' , or \rm -r "-e",.. what else? They all didn't work and the shell interprets -e as an option.