The flowers act like a trap of sorts; after the insect has entered the tube it is unable to exit until pollination occurs. The tube is lined with stiff downward-pointing hairs that only relax if the insect has brought pollen from another flower. If the insect is carrying pollen, the anthers, which are the male sexual organs, uncover and load the insect with a fresh supply of pollen before it leaves.

 

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the pipe-shaped flower