Toddybear is right. My own Onc. Nanboh Waltz (Onc. Makali x ornithorynchum) came into bloom Sept. 23 as well, and is nearly identical to yours. Mine is sometimes fragrant, but faintly so. I have fount that it likes a richer medium and more water than other Oncidiums, and, lucky for me, it loves the heat of Houston, Texas.