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Brassica juncea (L.) Czern. - Brassicaceae - brown mustard, Chinese mustard, Indian mustard, leaf mustard, Brauner Senf
Annual herb, up to 1m high, only known in culture; stem ercect, branched above; basal leaves lyre-shaped, upper ones oblong-lanceolate; flowers yellow; seeds hard, dark brown to black, 1-2 mm in diam.
„The species is an allotetraploid derived from hybridization between B. nigra (n = 8) and B. rapa (n = 10). Its center of origin is uncertain but is most likely the Middle East, with possibly independent multiple origins within overlapping ranges of the putative parental taxa (S. I. Warwick and A. Francis 1994).“
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200009253
Flora Malesiana, vol. 10: p. 544, fig. 1 (1984-1989) [J.C.D. in FTEA]
http://www.plantillustrations.org/species.php?id_species=155979