The usual suspects: meyer lemon, mandarin orange, lemon verbena, salvia clevelandii, rose hybrid 'westerland', honeysuckle, but a surprising one (to me) is that some of my epiphyllums are briefly, intensely fragrant in the early morning and again at night: a large white species type, and a beautiful little pink and white hybrid.  When they flower I bring them into the house one at a time (they only last a day and a half), and then that night the flower releases its scent for a couple of hours.  It is subtle, mysterious and enchanting.  Even I, who brought it inside earlier in the day, forget and wonder, "What is that smell that is so wonderful?"