Need help with I.D. from Oncidium Alliance

[Junebug]

This evening my stepdaughter gave me this beautiful orchid. There's no I.D. but it's clearly from the Oncidium alliance. The flowers are 5 1/2 in. from top to bottom and a little over 4 in. wide and they have a pale yellowish green wash that's not accurately captured in the photo. I'm picking up a faint fragrance reminiscent of baby powder. Could this be a Brassidium or Miltassia and are these names interchangable. The generic tag just says it's an orchid, duh, and that it prefers temperatures between 60 and 80 degrees. I hope it tolerates higher temperatures or it will more than likely succumb during our 95 to 100 degree incredibly humid summers.