The species identity of this cultivar is a bit uncertain - it was released as T. spathacea, but it seems to in fact be T. schippii.
T. schippii belongs to the Campelia subgenus, alongside T. zebrina. So, last year when my 'DRATRA01' flowered I tried to cross-pollinate it with my zebrina cultivars - the closest relative I had. I eventually got a few seeds, which turned into a few seedlings, and I was hopeful that I might actually have a new hybrid on my hands.