Flowers excite the senses in many ways not least by their colors and shapes, but especially by their fragrance. And scents vary as much as colors so although a catalog may describe a plant as highly fragrant you cannot judge for yourself without having the actual flower in front of you. Having said that it is useful to have a guide to plants that are scented. I found this list on the Birds and Blooms website.
Flowering TobaccoNicotiana spp.,?grown as an annual
Varieties like wood flowering tobacco are perfect for night gardens: Its jasminelike scent tends to be most noticeable later in the day. Available with pink, lavender, yellow, white, red or green blossoms, it prefers rich, moist, well-draining soil.
Four O’ClocksMirabilis jalapa,?annual to Zone 10
This fragrant flower opens in late afternoon and remains that way throughout the night, which explains the moniker ?beauty of the night.? Four-o?clocks often reseed, so don?t disturb the surrounding soil during spring cultivation.
JasmineJasminum polyanthum,?Zones 9 to 10
Jasmine is prized for its sweetly scented flowers and glossy leaves. This climbing container plant grows to 10 feet or more, with pink buds that open into aromatic white blossomsRead more at Birds and Blooms