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Gymnadenia odoratissima (L.) Rich. - Orchidaceae
short spurred fragrant orchid , scented gymnadenia, Wohlriechende Händelwurz, Duft-Händelwurz
Perennial herb, up to 30cm high, native to Central Europe; leaves lanceolate; flowers white to purplpe, fragrant.
„The fragrant orchid is characterized by intense vanilla-like scented flowers.“
http://de.wikipedia.org/wiki/Wohlriechende_H%C3%A4ndelwurz
 benzaldehyde (cherry-like) |  phenylacetaldehyde (green-floral, honey) |  benzyl acetate (sweet floral) |  phenylethyl acetate (floral rose) |  eugenol (clove-like) |
Of 44 volatiles identified in the flower scent, seven were physiologically active - benzaldehyde (8.0% day, 5.7% night), phenylacetaldehyde, benzyl acetate (20.8% day, 17.2% night), 1-phenyl-2,3-butandione (7.6% day, 8.4% night), phenylethyl acetate (24.7% day, 20.8% night), eugenol (4.6% day, 3.1% night), and one unknown compound. Phenylacetaldehyde increased during the night: 9.4% day, 24.7% night - the most pronounced change in odour emission. On GC, vanillin co-eluted with (Z)-isoeugenol (1.9% day, 3.3% night; sum).
[Floral scent emission and pollinator attraction in two species of Gymnadenia (Orchidaceae)., Huber, F.K., Kaiser, R., Sauter, W., Schiestl, F.P., Oecologia, Vol.142(4), 2005, 564-575]
Dietrich, A.G., Flora regni borussici, vol.1 t.66 (1832-1833)
http://plantillustrations.org/species.php?id_species=485171
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