Karen,
You would have examine the pollen on the blooms. It would require you to know enough to evaluate pollen for chromosome count under a microscope. There is a method, flow cytometry that is supposed to accurately measure daylily ploidy. You can read about this @ Heavenly Gardens website. An easier test of ploidy would be to use the pollen on both dip and tet cultivars and if you get seeds, see which survive to maturity and are viable. We have done this experiment with an unknown seedling. I set pods on both dips and tets but after a month the tet pods aborted and the dips survived to mature.
