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Wisteria floribunda (Willd.) DC. - syn. Glycine floribunda Willd.; Kraunhia floribunda (Willd.) Taub. - Fabaceae
Japanese wisteria, フジ fuji (jap.), Japanischer Blauregen, Japanische Wisteria

Deciduous woody climber, native to Japan and Korea, cultivated elsewhere as ornamental; stems twining clockwise; leaves imparipinnate, leaflets oblong; flowers in long racemes, 1.5-2cm, fragrant, corolla blue-white.

„…it has become one of the most highly romanticized flowering garden plants. It is also a common subject for bonsai, along with Wisteria sinensis…The flowers carry a distinctive fragrance similar to that of grapes.“ http://en.wikipedia.org/wiki/Wisteria_floribunda

3-Hydroxy-4-phenyl-2-butanone (creamy sweet fruity) was shown to contribute strongly to the characteristic odor of wisteria flowers. „The natural ketol in wisteria flowers was characterized as a 5:1 mixture of (S)-form and (R)-form.“
[Awano, Ken-Ichi, et al. „Synthesis of all four possible stereoisomers of 1-phenyl-2,3-butanediol and both enantiomers of 3-hydroxy-4-phenyl-2-butanone to determine the absolute configuration of the natural constituents.“ Bioscience, biotechnology, and biochemistry 59.7 (1995): 1251-1254] https://www.tandfonline.com/doi/pdf/10.1271/bbb.59.1251

The headspace of Wisteria floribunda flowers contained (S)-(+)-linalool (18.9%; 99.0%ee; coriandrol) with its flowery green note also known from green cardamom and jasmine absolute.
[Analysis of enantiomeric ratios of aroma components in several flowers using a Chiramix column., Tamogami, S., Awano, K.I., Amaike, M., Takagi, Y., Kitahara, T., Flavour and fragrance journal, 19(1), 1-5, 2004]

Of the 22 volatiles emitted from Japanese wisteria flowers and collected using a dynamic headspace technique, linalool (11.2µg/h/g), (E)-β-ocimene (4.0), benzyl alcohol (2.7) and 2-undecanone (0.9) were the most abundant. Sesquiterpenes including α-copaene, (E)-β-caryophyllene, α-humulene, germacrene D, and elemol were exclusively detected from japanese wisteria, whereas (E)-β-farnesene was detected from both chinese wisteria and japanese wisteria. Other compounds present in W.floribunda flower scent were (Z)-3-hexenyl acetate, methyl hexadecanoate, nonanal, decanal, indole, methyl chavicol, benzyl isocyanide and 1-nitro-2-phenylethane.
[Floral scent in Wisteria: chemical composition, emission pattern, and regulation., Jiang, Y., Chen, X., Lin, H., Wang, F., Chen, F., Journal of the American Society for Horticultural Science, Vol.136(5), 2011, 307-314]
http://journal.ashspublications.org/content/136/5/307.full.pdf+html

The main components of the volatiles from W.floribunda flowers were ocimene, (Z)-3-hexenyl acetate, limonene, α-pinene, camphene, (E)-3-caren-2-ol, 2-nonanone, 1,8-cineole, myrcene, and benzaldehyde.
[Changes in constituents and contents of volatile organic compounds in Wisteria floribunda at three flowering stages., Wang Q., Wang D., Zhang R., Gao Y., Journal of Zhejiang A&F University, Vol.31(4), 2014, 647-653]
http://zlxb.zafu.edu.cn/CN/article/downloadArticleFile.do?attachType=PDF&id=955

Wisteria floribunda, CC BY-SA 3.0, Author: Andreas Kraska