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The rostellum is a projecting part of the column in Orchidaceae flowers, and separates the male androecium from the female gynoecium, commonly preventing self-fertilisation. In many orchids, such as Orchis mascula, the pollinia or pollen masses, are connected by stipes down to adhesive discs attached to the rostellum which forms cups keeping the discs or balls sticky.

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  • Rostellum (botanique) (fr)
  • Rostellum (en)
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  • En botanique, le rostellum est une partie saillante de la colonne appelée Gynostème sur les fleurs d'Orchidaceae qui sépare la partie mâle, étamine, de la partie femelle, gynécée, et empêchant généralement l'auto-fécondation. Il s'agit de la partie modifiée du troisième lobe stigmatique. Il forme généralement une saillie vers l'avant, et de ce fait, devient le premier obstacle rencontré par l'insecte visiteur. Certaines formes ont alors évoluées pour produire une colle permettant un maintien efficace des pollinies sur le corps des pollinisateurs. (fr)
  • The rostellum is a projecting part of the column in Orchidaceae flowers, and separates the male androecium from the female gynoecium, commonly preventing self-fertilisation. In many orchids, such as Orchis mascula, the pollinia or pollen masses, are connected by stipes down to adhesive discs attached to the rostellum which forms cups keeping the discs or balls sticky. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Fertilisation_of_Orchids_figure_1X.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Fertilisation_of_Orchids_figure_28.jpg
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  • En botanique, le rostellum est une partie saillante de la colonne appelée Gynostème sur les fleurs d'Orchidaceae qui sépare la partie mâle, étamine, de la partie femelle, gynécée, et empêchant généralement l'auto-fécondation. Il s'agit de la partie modifiée du troisième lobe stigmatique. Il forme généralement une saillie vers l'avant, et de ce fait, devient le premier obstacle rencontré par l'insecte visiteur. Certaines formes ont alors évoluées pour produire une colle permettant un maintien efficace des pollinies sur le corps des pollinisateurs. (fr)
  • The rostellum is a projecting part of the column in Orchidaceae flowers, and separates the male androecium from the female gynoecium, commonly preventing self-fertilisation. In many orchids, such as Orchis mascula, the pollinia or pollen masses, are connected by stipes down to adhesive discs attached to the rostellum which forms cups keeping the discs or balls sticky. In Catasetum flowers the rostellum projects forward at each side as an "antenna", and the pollen masses are connected by a bent stalk or pedicel to a sticky disc kept moist at the back of the flower. When an insect touches an "antenna", this releases the bent pedicel which springs straight and fires the pollinium, sticky disc first, at the insect. Charles Darwin described in Fertilisation of Orchids how he "touched the antennæ of C. callosum whilst holding the flower at about a yard's distance from the window, and the pollinium hit the pane of glass, and adhered to the smooth vertical surface by its adhesive disc." (en)
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