Oncidium varicosum

Oncidium varicosum - Photo by Richard Lindberg

Oncidium varicosum grows in Brazil, Bolivia and Paraguay. It is cool to hot growing and blooms in summer and fall with many yellow flowers on spikes up to 5 feet long. The genus Oncidium (Onc) contains 600 species from throughout Central America and South America. They grow in a wide variety of environments. If you know a little about where the species grows, they do very well in cultivation.