Most flowers have male and female parts that aid in the plants' reproduction. Reproduction occurs when the pollen is released from the male organs and travels to the female organs. Most flowers require assistance in moving the pollen to the flower's stigma. Still, some plants are able to self-pollinate by allowing the flower's anthers to release pollen directly into its own stigma.
The orchid is one of the few flowers that are able to self-pollinate. The orchid species Holcoglossum amesianum begins the self-pollination process by removing its anthers. Once the anthers are detached, the orchid grows a flexible rod called a stipe. As the stipe grows, it curves forward and downward into the rostellum, which is the structure that separates the male and female flower parts. The stipe continues its curve until it reaches past the rostellum and inserts the pollen into the stigma.
The Kallstroemia is a self pollinating flower that is commonly known as the Arizona poppy. The Arizona poppy is an annual plant that blooms in orange and yellowish-orange flowers. The anthers of the Arizona poppy's stamen are unusually heavy for the flower's filament. As the anther becomes fully developed, its weight causes the filament to bend backward and downward. As the filament bends, the anther meets the stigma, and the pollen is dropped into the flower's ovary, completing the Arizona poppy's self-pollination process.
Legumes are avid self- and cross-pollinators. Once the legume's flowers bloom, the anthers of the flower surround the style and shed pollen directly into it. The pollen-covered style holds the pollen until the stigma grows to a generous height within the flower. Once the stigma is fully grown, the style bends to touch the stigma and completes the pollination process.