The Carnivorous Plant FAQ Field Trip Report -

Drosera filiformis in Florida, 2010

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Of course, the yellow flowers are those of Utricularia--but I was not able to immediately identify this species to my satisfaction.

On one hand, the inflorescences were fairly short, and the flowers were congested near the tops of the inflorescences. This made me suspect the species was probably Utricularia cornuta.

But could I be sure they were not U. juncea? There were no cleistogamous flowers present, as is commonly the case with U. juncea. Even so, the flowers were smaller than I am used to seeing with Utricularia cornuta--from tip of the corolla to the end of the spur, they were only about 13mm long.

Ultimately, I concluded they probably were simply small-flowering Utricularia cornuta. This diagnosis was supported by the flowering season. In the southeastern US, Utricularia cornuta tends to flower in early summer, while U. juncea flowers later in the fall.

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Revised: June 2010
©Barry Rice, 2005