I seem to recall a comment in this discussion about species Iris not having plicata patterns (I'm not going to check which post nor the context), but wanted to point out that species such as I. histrioides, I. missouriensis, several Aril species, etc. can show stitched (darkened vein) patterns that certain seem to qualify as plicata patterns. It would be interesting to compare genetics of these various species to see if "genes" and mechanisms that control the patterns are (ever, or always?) related.
Dave
