Orchids are very beautiful to look and it even has a very soothing smell. They have an excellent fragrance which allures people. A list of all fragrant orchid species would be really very gigantic, as it would always be growing due to the presence of new hybrids registered practically every week. Anyways a small list of orchids definitely-not-complete list of fragrant orchids is:
Aerangis: Most of these species are small in size and has evening fragrance.
Aeranthes: Only a few species have fragrance.
Aerides: Most of these have very good fragrance, they are tall, and have lanky growth and roots.
Ancistrochilum rothschildianum: These orchids are small and deciduous in winter.
Brassavola: Most of these orchids are very night-scented, which also includes the well-known Brassavola nodosa, or "lady of the night" orchid.
Brassia: They are huge and are spiderlike flowers.
Brassidium: They are popular scented brassia hybrids.
Brassocattleyas: These are the ones which crosses between brassavola and cattleya, most of them are scented and some of them are intensely scented.
Brassolaocattleyas: These are the ones which are the crosses of three different genuses and most of them are scented.
Catasetum: They are large, deciduous orchids which bears male or female flowers. Various species are fragrant, including those which belongs to callosum, pileatum and tenebrosum and many well-known hybrids with other genuses are likewise fragrant.
Cattleya: The classic orchid and the most fragrant species are said to be generally bicolor, dowiana, iricolor, labiata, maxima, mossiae, schilleriana, and warscewiczii. Literally out of thousands of these hybrids, many are scented, some of them are intensely fragrant
Clowesia: These are the plants which lose their leaves in the winter and most of these species are scented.
Dendrobium: These are the very popular genus of orchid. Many of them have tall canes and lose their leaves in winter. Most of these species are scented and the popular species include kingianum, loddigesii, monoliforme, nobile, parishii and speciosum
Dendrochilum: Most of these are scented, with chains of tiny flowers, including cobbianum, glumacaeum, magnum.
Gongora: Most of these species are small and are highly scented. These are the flowers which are often short-lived.
Haraella odorata: These are the most popular fragrant miniature orchid on the Orchid Forum.
Sedirea japonica: These are extremely fragrant small or long orchids generally cultivated in Japan.
Vanda: These are the ones with big, long aerial roots, harder to grow in the North region and the smaller scented species include cristata, denisonia, suavis, and tessellata.
Zygopetalum: Most of these species are highly scented and are usually found as complex hybrids and many of them also smell fantastic.

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