From American Daylily Society, "Although daylily flowers can exhibit a variety of different color features, the term pattern is reserved for a design that goes beyond the basic markings.
A patterned daylily is one that exhibits different colors or variations in hue, value, or saturation in such a way that a design is created. The definition includes, but is not limited to, regular repeating patterns (e.g. flowers exhibiting concentric rings or feathering of color within the eyezone or elsewhere), or irregular random patterns (e.g. flowers exhibiting stippling or variegation such as streaks, spots, patches or stripes)."