Allium nigrum L. (Medit.) – An exceptional and probably ephemeral escape from cultivation or throw-out. A single plant was seen in grassland alongside a former railway track in Gistel in 2013.
Allium nigrum is frequently naturalized outside of the Mediterranean area, for instance in parts of North America (McNeal & Jacobsen 2002) and in the British Isles (Stace 2010).
Selected literature:
McNeal Jr. D.W. & Jacobsen T.D. (2002) Allium. In: Flora of North America Editorial Committee (eds.), Flora of North America, vol. 26. Oxford University Press, New York-Oxford: 39-40. [available online at: http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=101086]
Seisums A. (1998) Identify and typification of Allium magicum, A. nigrum, and A. roseum (Alliaceae). Taxon 47(3): 711-716.
Seisums A. (1998) (1369) Proposal to conserve the name Allium nigrum, with a conserved type, against A. magicum (Liliaceae). Taxon 47(3): 745-746.
Stace C. (2010) New flora of the British Isles, 3th ed.: XXXII + 1232 p. Cambridge University Press.