How the daffodil got its trumpet

That tube-like thing that characterizes daffodil flowers is, in fact, as funky as it looks:

We found that the corona develops from the hypanthium, and is not simply en extension of the petals or stamens,” says Dr Scotland. “The corona is an independent organ, sharing more genetic identity with stamens, and which develops after the other organs are fully established.

via How the daffodil got its trumpet.