I just obtained a tetraploid conversion of the diploid daylily 'Brocaded Gown'. I already have the diploid 'Brocaded Gown' in my plant list, and I was going to add the tetraploid converted plant to my list, but there does not seem to be a separate entry or mechanism to do that.
Just an observation...
Tetraploid conversions aren't widely commercially available (I got this from the Lily Auction) and may not be stable (I'll find out, I guess). Clearly you don't want to have to duplicate ALL of the diploid entries for their potential tetraploid counterparts, but is there/will there be some way of adding the occasional tet conversion to the database?