Armoracia P. Gaertn., B. Mey. et Scherb.
Armoracia is a genus of three similar species native to southeastern Europe and southwestern and northeastern Asia. Contrary to Mabberley (2008) none is native in North America: Armoracia lacustris (A.Gray) Al-Shehbaz & V.M.Bates is now accommodated in Rorippa (compare Al-Shehbaz 2010a,b). One species, Armoracia rusticana, is widely cultivated as a condiment.
References:
Al-Shehbaz I.A. (2010a) Armoracia. In: Flora of North America Editorial Committee (eds.), Flora of North America, vol. 7. Oxford University Press, New York-Oxford: 459-460.
Al-Shehbaz I.A. (2010b) Rorippa. In: Flora of North America Editorial Committee (eds.), Flora of North America, vol. 7. Oxford University Press, New York-Oxford.
Courter J.W. & Rhodes A.M. (1969) Historical notes on horseradish. Econ. Bot. 23(2): 156-164.
Fosberg F.R. (1965) Nomenclature of the Horseradish (Cruciferae). Baileya 13: 1-4.
Franzke A., Pollmann K., Bleeker W., Kohrt R. & Hurka H. (1998) Molecular systematics of Cardamine and allied genera (Brassicaceae): ITS and non-coding chloroplast DNA. Folia Geobot. 33(3): 225-240.
Lawrence G.H.M. (1971) The horseradish Armoracia rusticana. Herbarist 37: 17-19.
Mabberley D.J. (2008) Mabberley’s plant-book (3th ed.). Cambridge University Press, Cambridge: XVIII + 1021 p.