German iris having large white flowers with lavender-tinged falls and a fragrant rhizome WordNet 3.0 & Open English WordNet

The identity of the plant first described by Carl Linnaeus as Iris florentina remains unclear, as of December 2021. Wikipedia

Species of plant - Stem apically 2-flowered, often with a short branch bearing a third flower. Pure white flowers, with light veins greenish-yellow to the hafts of both the falls and standards. Elongated elliptical standards; elongated-cuneate falls. Wikidata

Any of several irises that have a fragrant root, especially Iris × germanica. Wiktionary