Ahhh, thanks for the info A.L.
I don't get up to RIH that often, but I remember comfortably enjoying Motivo goodies and a beverage, while waiting for a friend that was enduring a not so comfortable procedure.

Ha! I ended up pulling out two of my mystery plants. They came out of the ground without a fight, which adds to my suspicions that they may be a legitimate plant. I've left one of these plants in the flower bed for observation purposes.