I had recently learned about Partridge Pea extrafloral nectaries, told Dave, John, and Laura what I had learned, and here we are trying to photograph EFN visitors. I like intellectually inquisitive people such as these :-)
An ant (species unknown to me) drinks from an extrafloral cup. Ants may be the best known visitors of partridge pea extrafloral nectaries. But many other insects visit the sugar cups, on partridge pea and the other 2,000 or so plants in over five dozen families worldwide that have EFN. One theory is that by enticing predatory insects, as many ants and wasps are, into the foliage via extrafloral nectaries, they will discourage herbivory and flower damage by attacking insect herbivores such as caterpillars.
I have seen many other insect species visiting the extrafloral nectaries, and hope to spend some more time photo-documenting them. Oh, one might wonder why someone like me would wish to entice wasps and bees into close proximity to my front door and walkway. It's not a problem. These insects are non-aggressive, quite busy with their activities, and pay us no mind. In many years of sticking my camera in the faces of stinging insects, I have only been stung a few times - and those were by bald-faced hornets after apparently approaching their large paper nests a bit too close.