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Prunus spinosa L. - Rosaceae - blackthorn, sloe, sloeberry, Schlehe, Schwarzdorn
Deciduous shrub, up to 3m high, native to Europe, West Asia, North Africa; branches reddish brown, spiny; leaves 2-5cm long, ovate to oblong, crenate, abaxially yellowish green and pubescent, adaxially dark green and sparsely appressed pubescent; flowers white, solitary, appearing before the leaves, petals 6mm long; fruits globose, deep blue to nearly black, glaucous.
„This species is cultivated for its edible fruit and as grafting stock for other species of Prunoideae.“
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200011162
The ripe fruits are usually harvested after the first frost on the bush. By natural or artificial freezing, a big part of bitter and astringent tannins of the fruit is enzymatically degraded. In this case, the tannin content of the juice decreases from about 1% to less than 0.5%. Complete degradation of tannins is not intended because of their significant contribute to flavor.
http://de.wikipedia.org/wiki/Schlehdorn
Benzaldehyde, benzyl alcohol, 1-hexanol and (E)-2-hexenal were selected by AEDA as principal aroma-active components of P.spinosa.
[Dolezal, M., Velíšek, J., Famfulíková, P., Pfannhauser, W., Fenwick, G. R., & Khokhar, S. (2001). Chemical composition of less-known wild fruits. In Biologically-active phytochemicals in food: analysis, metabolism, bioavailability and function. Proceedings of the EUROFOODCHEM XI Meeting, Norwich, UK, 26-28 September 2001. (pp. 241-244). Royal Society of Chemistry.]
Thomé, O.W., Flora von Deutschland Österreich und der Schweiz, Tafeln, vol.3, t.394 (1885)
http://plantgenera.org/species.php?id_species=1266519