Triggered mainly by the shortening periods of darkness during spring and summer, flower buds open to display brightly-colored petals that attract insects seeking nectar. Once a flower has been pollinated, its petals shrivel and drop off.

Oxford Scientific Films

Iris," Microsoft® Encarta® 96 Encyclopedia. © 1993-1995 Microsoft Corporation. All rights reserved.

Texas A & M UniversityVascular Plant Image Gallery.

Albion College Vascular Plant Image Gallery.

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