This is a nice 'alba' - Rhyn gigantea 'Mary Motes' - y'all will never, ever guess who cooked it up!
A lovely plant without flowers, easy to grow; needs a little less light than standard vandas. The flowers are always described as 'fragrant' but I think they kind of smell like cat pee. These plants get very fat roots, some bigger around than a pencil! Give them room.
Cheers - Nancy