Lady of the evening is a discriptive name for Brassavola nodosa due to the fragrance it emites at night. Most of the other Brassavolas do too but they're no where near as common as nodosa. It easiest to grow mounted on something like bark or tree fern because it's very easy to rot off by overwatering in a pot and because the flowers are displayed better when held up a bit due to their floppy nature. Good gardening.
Gary