Supposedly fragrant, but as usual, I can't verify that.
The internet failed to give me much interesting information on this one; the most interesting comment I ran across was "to be pronounced at one's own risk," which maybe I've just been doing this too long but I don't see anything especially difficult in the name, long and unfamiliar though it is. Is it not, "RIN-kat-lee-ANN-thee SIN-ying KATH-ur-inn doh-guh-SHE-muh?" 'Cause that's how I pronounce it in my head.1
Doesn't do much for me one way or another, but sure, it's fine, whatever.
Rhyncattleanthe Hsinying Catherine = Cattleya Fair Catherine x Rhyncattleanthe Love Sound (Ref.)
I looked for an official pronunciation for Rhyncattleanthe on-line and found a page that has a lot of orchid genus pronunciations on it; they say I have it wrong, that it's either (rin-KAT-lee-AN-thee) or (rin-kat-lee-AN-thee). I'm pretty sure I was close enough for casual conversation.
And as I've said previously, it's dumb to let yourself get too hung up on trying to pronounce botanical names correctly, either as a novice scared to make the attempt for fear of getting it wrong or as an expert chastising novices for errors. Make the attempt. If someone else has a pronunciation that seems more reasonable than the one you're using, switch; if not, keep doing what you're doing. And if someone gets all superior with you about pronunciations and tries to make you feel stupid, punch 'em in the dick and move on.
(Punching someone else is assault, and you shouldn't do it. I've just been looking for an excuse to link the video for a long time now. Should have known it'd come up in the context of orchids.)