|The trumpet (gold) and petals (pale yellow)|
Source: Wikimedia Commons
But now, researchers from the University of Oxford (UK) have determined that the trumpet is not a part of the petals, and is its own unique organ. The researchers discovered this by studying the flowers as they formed, and dissecting the bulbs to see how the different parts of the flower developed. In daffodils, the four main parts that all flowers have develop at the same time, while the trumpet is formed later. Because of this difference in development times, the researchers concluded that the trumpet is distinct from the other four organs.
For a little article about the classification of parts of a daffodil, I really like this story. The article has some interesting background and quotes that put the finding in context. This is a fun science article, and the next time I see daffodils, I'll be sure to check out the trumpet-petal difference. Fingers crossed I'll see daffodils (and spring!) sometime soon.