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One type of automatic self-pollination occurs in the orchid Ophrys apifera.One of the two pollinia bends itself towards the stigma.. Self-pollination is a form of pollination in which pollen arrives at the stigma of a flower (in flowering plants) or at the ovule (in gymnosperms) of the same plant.
Orchid flowers are predominantly hermaphroditic, with unisexual forms being rare, and they typically exhibit zygomorphic (bilateral) symmetry. Most genera feature three outer elements known as sepals —two lateral and one dorsal—and three inner elements called petals , with the lower petal often modified into a lip or labellum .
Satyrium carneum.Ground orchid with typical zygomorphic floral anatomy. Zygomorphic ("yoke shaped", "bilateral" – from the Greek ζυγόν, zygon, yoke, and μορφή, morphe, shape) flowers can be divided by only a single plane into two mirror-image halves, much like a yoke or a person's face.
[125] [note 1] He identified 24 classes, based mainly on the number, length and union of the stamens. The first ten classes follow the number of stamens directly ( Octandria have 8 stamens etc.), [ 123 ] while class eleven has 11–20 stamens and classes twelve and thirteen have 20 stamens; differing only in their point of attachment.
Drakaea glyptodon, commonly known as king in his carriage [2] is a species of orchid endemic to the south–west of Western Australia. It is pollinated by a single species of male thynnid wasp using sexual deception. The orchid's labellum is similar in shape and scent to a flightless female thynnid wasp. It is the most common drakaea and has ...
The whitish, fluffy head of a dandelion, commonly blown on by children, consists of numerous seeds resting on the receptacle, each seed attached to its pappus. The pappi provide a parachute-like structure to help the seed travel from its point of origin to a more hospitable site.
Coelia bella is a species of orchid native to Mexico, Guatemala, Honduras, [2] Belize, and Costa Rica. [1] It produces trumpet-shaped flowers that are intensely fragrant, [ 3 ] with a smell like marzipan [ citation needed ] .
The orchid family (Orchidaceae) is subdivided into five subfamilies, and then into tribes and subtribes. Groups of closely related genera are sometimes referred to informally as alliances . An alliance is a group of taxa, at any taxonomic rank , but usually at the rank of genus or species, that are thought to be closely related.