Iris. Here's a picture on the business end of an Iris. You can see how it funnels the bee in through that tiny little passage and forces the bee to leave with pollen on it's back. You can't quite see the stamens and stigma as the falls curve on inward a bit but they rest up against the top surface and end up rubbing pollen quite effectively on/off of the bees little furry back! Would you crawl down a yellow, hair-lined tunnel that looked like that?
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