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Hesperis matronalis L. - Brassicaceae - dame’s rocket, sweet rocket, damask-violet, Gewöhnliche Nachtviole
Biennial or perennial herb, up to 80cm tall; basal leaves withered by flowering, cauline leaves narrowly oblong, lanceolate, or broadly ovate; flowers deep purple, lavender, or white.
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200009560
„…native to Eurasia and cultivated in many other areas of the world for their attractive, spring-blooming flowers… In Europe, it is host to the caterpillars of several butterfly species, including the Orange Tip Anthocharis cardamines, Large White Pieris brassicae, Small White Pieris rapae, and moths, such as Plutella porrectella.“
http://en.wikipedia.org/wiki/Hesperis_matronalis
Floral rate emission measurements showed two main groups of scent components: Aromatics like benzaldehyde, benzylacetate, benzyl alcohol, benzyl benzoate, as well as terpenoids like alpha-pinene, 1,8-cineole, E-beta-ocimene, and linalool.
[Flower color–flower scent associations in polymorphic Hesperis matronalis (Brassicaceae). Cassie J. Majetic, Robert A. Raguso, Stephen J. Tonsor, Tia-Lynn Ashman, Phytochemistry 68 (2007) 865–874] http://www.pitt.edu/~biology/Dept/pdf/1970.pdf
The seeds contain an alkaloid derived from choline, hesperaline.
Hesperis matronalis, CC BY-SA 3.0, Author: Andreas Kraska
Hesperis matronalis flowers, CC BY-SA 3.0, Author: Andreas Kraska