This is a very rare yellow variety of Ctna. Why Not. It may be the only yellow variety of Ctna. Why Not in existence. The rest is crimson or red. I obtained this plant from Orchid Center. It is a cutting from the mother plant which has received awards from the American Orchid Society and Honolulu Orchid Society. My plant is currently in a 3-inch clay pot grown in New Zealand Sphagnum moss.