Iris sibirica 'Shirley's Choice' (McEwen 1987) Tetraploid, Midseason. Dainty 4" white flowers, charmingly ruffled, with the standards and feathered styles forming a central cup. The falls have a faint chartreuse tint deepening at the hafts. One branch and 3 buds on successive stalks. 31", Z4-9.