Iris aphylla is a broadleaf deciduous perennial bulb / corm / tuber with green foliage. In spring purple flowers emerge. Grows well with sun and even moisture - regular water. A good option if you're seeking something verticillium wilt resistant.
An unusual species ranging from the Caucasus into Eastern Europe, it is distinct in its section being the only member that goes completely leafless in winter, flowers are typically in some shade of blue or purple. ZONE 5