This is blooming now (February) here in the state of Sao Paulo of Brazil, at the same time my oncidium reflexum and miltonians and miltonopsis. I think it's a species, not a hybrid. It has put out as many as five blooming stalks, but this year only one. I need to find out what it is, and what it wants before it goes into Pout.
It's mounted on the inclined trunk of a aroera tree - loose bark. There is quite an accumulation of older roots between it and the tree. I tried cleaning out the dried pseudobulbs and reattaching them closer to the trunk two years ago, and that's when it started giving me fewer flower stalks.
I give is weak fertilizer - foliar - most weeks in the summertime.