Oncidium nudum grows in northern South America in hot, humid wetlands. It blooms in winter and has an inflorescence that extends almost two feet.
Orchids bloom if they are happy but also when they think they need to use all their remaining energy to continue the species. As soon as I was able to take the flower picture I cut it off and remounted it. I should have cut the spike as soon as I saw it.
The two pseudobulbs on the right are new this year. They are not as thick as the older ones but they are a paler green, so I know I am getting the lighting more to its liking.