Iris may be rhizomatous or bulbous perennials, with narrow leaves and erect stems bearing flowers with 3 large spreading or pendent fall petals, alternating with 3 erect, often smaller, standard petals, in late winter, spring or early summer
Name Status
Accepted
Horticultural Group
Sino-Sib irises are deciduous clump-forming perennials derived from Chinese species in the Sibiricae series, with the chromosome number 2n=40, rather than the 2n=28 of other Siberian irises