Lots of my daylilies I would call slightly fragrant which means stick your nose in to smell. Some actually don't smell all that good to me. Some smell strongly only in hot humid weather. However, off the top of my head I have 3 that are very fragrant: Early Fragrance, Ebony Circle (didn't bloom this year but last year could smell it a few feet away) and Gold Helmet (large flowers with typically several open and VERY fragrant.
Edited to add a photo of Gold Helmet.
