Having the cross properly recorded is, I think, a very important thing. It is a window into all the genetic traits that can influence the seedlings it produces. Some hybridizers embraced it wholeheartedly when it was first put in place---other hybridizers, not so much. Dan Trimmer and Pat Stamile are good examples of the the ones who embraced it. The Salters , not so much. When researching daylilies one must keep in mind that the registration process is really not that old. Hopefully, all hybridizers in the future will register all cross information they have on the flowers they register, no matter how long the cross is. That way, as time goes on, we will have a more accurate database to work from. One can get more information about a particular plant by communicating with the hybridizer directly, because most of them keep records of what they do. They could tell you what "seedling" means. The problem with that is what does one do when the hybridizer is deceased. Any record of the "seedling" will then be lost.
I know Dan from when he visited our Region 15 conference that we hosted. I arranged for him to speak, and then had the great pleasure of escorting him through the process to make sure everything went well for him. Dan is a great hybridizer, and wonderful person. He has a colorful background in law enforcement and real estate. If you get a chance to talk with him, you will find an instant friend.