Tinkturenpresse

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Betula pubescens Ehrh. - Betulaceae - downy birch, moor birch, Moor-Birke

Deciduous tree, up to 20m tall, native to North Europe and West Asia;

Betula pubescens subsp. pubescens - syn. Betula alba L. - white birch
Betula pubescens subsp. tortuosa - syn. Betula tortuosa Ledeb. - mountain birch

Fresh birch leaves own a very pleasant „green“ smell.
Analyses showed that (Z)-3-hex-en-1-ol and 1-hexanol are major constituents of the birch-leaf volatiles from both B.pubescens (27%) and B.pendula (19%). Other compounds present are (E)-2-hexenal, (E)-beta-ocimene, hexyl acetate, (E)-2-hexene-1-ol, and (E)-alpha-farnesene.
[Volatiles from nonhost birch trees inhibit pheromone response in spruce bark beetles. Byers, J. A., Zhang, Q. H., Schlyter, F., Birgersson, G., Naturwissenschaften, Vol.85(11), 1998, 557-561]
http://www.chemical-ecology.net/pdf/Byersetal1998.pdf

Masclef, A., Atlas des plantes de France, vol.3, t.306 (1891)
http://plantgenera.org/species.php?id_species=141340