"Iris savannarum" is different to Iris hexagona in several features, including seed capsules ("Iris hexagona" capsules are hexagonal while "Iris savannarum" capsules are rounded), leaves ("Iris hexagona" has yellow-green leaves, while "Iris savannarum" has bright green leaves) and blooming times ("Iris hexagona" flowers one month later than "Iris savannarum").