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The cross section of the ovary of the iris flower shows three carpels joined at center into a mass. The three parts are clearly traceable.

Cross Section of Ovary of Flower of Iris

The cross section of the ovary of the iris flower shows three carpels joined at center into a mass.…

A blue flag iris.

Iris

A blue flag iris.

"Roots, rootstocks, and leaves of iris." -Bergen, 1896

Iris

"Roots, rootstocks, and leaves of iris." -Bergen, 1896