Parts of an Iris Flower: Detailed Anatomy

The iris blossom is unique, revered as France's fleur-de-lis. Flower parts are always in multiples of three. Generally, three upright petals are "standards," three horizontal/drooping petals are "falls." Slight variations exist between beardless and crested types.

Bearded Iris

Three ruffled oval standards held upright. Three larger falls drooping backward. Each fall has a yellowy cluster of male parts (pollen-shedding) called the "beard." In the center, partially hidden by standards, are female parts: stiff, waxy, often fragrant style arms. Within them are stigmas receiving pollen to fertilize ovaries for seeds. All bearded/German irises display this structure.

Beardless Iris

Floral parts also in threes. Main difference: no beards, smaller more open petals. Three spreading tongue-like standards. Three small ruffled style arms housing female parts. Below them, outside standards, three larger falls with a wedge-shaped color band called the "signal." Both standard and fall petals narrow at base into a shoulder-like "haft." Examples: Siberian, Louisiana irises.

Crested Iris

Instead of a beard, a crest/ridge on each fall. Core has three waxy style arms with jagged edges. Immediately under them are three uniform standards, often toothed/lobed. Under standards lay three larger, ornate falls with minutely jagged edges and a central crest where the haft narrows. Also called Evansia iris; common example: dwarf crested iris (Iris cristata).

Understanding iris anatomy deepens appreciation for this regal flower.