There are two separate entries in the database for Hemigraphis 'Exotica', one with exotica as a species name which I don't believe is correct, I think Exotica is a cultivar name. I couldn't find H. exotica listed at the ITIS site and the KEW site doesn't show the name as accepted, but rather shows it as unresolved. Anyway ... these two are the same plant so do we need two separate entries? I believe all other data information is the same for both plants so one of the database moderators can decide which to move.
Purple Waffle Plant (Hemigraphis 'Exotica')