Christman's balm (Dicerandra christmanii), or Garrett's mint, is a truly fascinating story and a wonderful member of this amazing genus. Discovered and collected by Ray Garrett in 1948, it was never formally described as a new species and its type location was very poorly described. After that, it was "lost" for decades. It took one of Florida's best field naturalists, Steve Christman, to finally rediscover it in 1989 and it was described then as a unique species.
It is never likely, however, to be offered commercially.