subfamily iridoideae is distributed throughout the range of the family and contains the large genera "iris" and "moraea". it is the only subfamily that is represented in north and south america. the species have flowers in solitary clusters among large bracts, styles that are often petal-like or crested and nectar (when present) is produced from glands on the tepals. most species have separate petals and the rootstock is usually a rhizome or rarely a bulb. the flowers are almost always radially symmetrical. "bobartia", "dietes" and "ferraria" belong to this subfamily.