diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening | low-growing spring-flowering American iris with bright blue-lilac flowers |
muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye | low-growing summer-flowering iris of northeastern United States |
plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals | |