A variegata has yellow standards & red falls. It is named after the species of that name. Many MTBs originaaly came from that species so all irises of that color have the term.
The falls look more brown, than red in this picture of my husbands iris, but it is the coloration. A bitone pink is a bitone, not a special name as it showed up in hybridizing not in the wild. Pink is a recessive color in irises. Back to neglectas---
