Gongorgas and Stanopias tend to have heavy, intense scents. I have a Gongorga "Golden Condor" hybrid and the hanging spike smells strongly of potporie. Oncidiums often have very sweet smelling blooms. "Sharry Baby" is known for its chocolate smell. Brassavola nodosa smells strongly of a perfume called "Wind Song". It is fragrant only after dark. Many Cattleya hybrids have scents either like lemon or hyacinth. Their relatives the Laelias often have delicious licorise smells. Of course there is the other end of the spectrum. Bulbophyllums often smell of decaying flesh or excrement. Pleurothallids often smell like mushrooms, especially the Draculas.
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