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Flowers

Orchid flowers have three sepals, three petals and a three-chambered ovary. The three sepals and two of the petals are often similar to each other but one petal is usually highly modified, forming a "lip" or labellum. In most orchid genera, as the flower develops, it undergoes a twisting through 180°, called resupination, so that the labellum lies below the column. The labellum functions to attract insects, and in resupinate flowers, also acts as a landing stage, or sometimes a trap.

The reproductive parts of an orchid flower are unique in that the stamens and style are joined to form a single structure, the column. Instead of being released singly, thousands of pollen grains are contained in one or two bundles called pollinia that are attached to a sticky disc near the top of the column. Just below the pollinia is a second, larger sticky plate called the stigma.