A surprising number of phals (in my experience) are at least very slightly fragrant in the right conditions. I don't really have much experience with species, so I'm mostly talking about the hybrids, which obviously have mixed parentage.
What I find with the "standard" hybrids is that they are most fragrant in the morning, and in situations where they are getting natural sunlight. My orchid friends think I'm crazy, and I don't contest that diagnosis, but I swear on my life, it's true.
I have a neighbor who buys phals in bloom, then drops them off at my doorstep when they are done flowering. While I end up giving away or returning most of the phals that I'm able to revive and bloom, it means that quite a number of varied NOIDs have moved through my collection over the years. I guess what I'm saying is, I've noticed the fragrances in a wide variety and large number of phals over the years. From whites to purples to harleqins to candy striped -- many have the potential for fragrance.
Again, for most, the scent is very faint, but for me it's detectable.
