iridaceous plant - any bulbous plant of the family Iridaceae

genus Iris - large genus of perennials that develop from bulbs or rhizomes

bearded iris - any of numerous wild or cultivated irises with hairlike structures on the falls (the drooping sepals)

beardless iris - any of numerous wild or cultivated irises having no hairs on the drooping sepals (the falls)

bulbous iris - any of various irises having a rootstock formed like a bulb

Iris cristata, dwarf iris - low-growing summer-flowering iris of northeastern United States

gladdon, gladdon iris, Iris foetidissima, roast beef plant, stinking gladwyn, stinking iris - iris with purple flowers and evil-smelling leaves; southern and western Europe and North Africa

Iris persica, Persian iris - bulbous iris native to Asia Minor cultivated for its pale lilac-colored flowers

Iris pseudacorus, yellow flag, yellow iris, yellow water flag - common yellow-flowered iris of Europe and North Africa, naturalized in United States and often cultivated

dwarf iris, Iris verna, vernal iris - low-growing spring-flowering American iris with bright blue-lilac flowers

blue flag, Iris versicolor - a common iris of the eastern United States having blue or blue-violet flowers; root formerly used medicinally

Iris virginica, southern blue flag - similar to blue flag; the eastern United States

English iris, Iris xiphioides - bulbous iris native to the Pyrenees; widely cultivated for its large delicate flowers in various colors except yellow

eye, oculus, optic - the organ of sight

pupil - contractile aperture in the iris of the eye

tissue layer, membrane - a pliable sheet of tissue that covers or lines or connects organs or cells of animals

diaphragm, stop - a mechanical device in a camera that controls size of aperture of the lens; "the new cameras adjust the diaphragm automatically"