Mistress of the Night
(The). The tuberose is so called because it emits its strongest fragrance after sunset. Sometimes, on a sultry evening, when the atmosphere is highly electrified, the fading flowers of the tuberose emit sparks of lucid flame.
(In the language of flowers, the tuberose signifies “the pleasures of love.”)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894