Hornungia alpina (L.) O. Appel (syn.: Pritzelago alpina (L.) Kuntze, Hutchinsia alpina (L.) W.T. Aiton, Noccaea alpina (L.) Rchb.) (SW and C Eur., N Afr.) – An exceptional escape from cultivation. Recorded only once, at a foot of a wall, in Berchem (Antwerpen) in 2013.
The plant seen in Berchem has flexuous, leafy stems, a character of subsp. auerswaldii (Willk.) O. Appel (Heywood & Jones 1964). This and the other subspecies are cultivated as ornamentals, mostly for the rock garden (Jäger & al. 2008). Records outside of cultivation are fairly rare. A claim from the British Isles was considered dubious (Clement & Foster 1994).
 |
 |
 |
 |
Selected references:
Clement E.J. & Foster M.C. (1994) Alien plants of the British Isles. BSBI, London: XVIII + 590 p.
Heywood V.H. & Jones B.M.G. (1964) Hutchinsia. In: Tutin T.G. & al. (eds.), Flora Europaea, vol. 1. Cambridge University Press, Cambridge: 316-317.
Jäger E.J., Ebel F., Hanelt P. & Müller G. (eds.) (2008) Rothmaler Band 5. Exkursionsflora von Deutschland. Krautige Zier- und Nutzpflanzen. Springer Verlag, Berlin: 880 p.
Teles A.N. (1971) Treze espécies e subespécies novas para a flora de Portugal: Hutchinsia alpina (L.) R. Br. ssp. auerswaldii (Willk.) Lainz. Agron. Trop. 33(18): 6-10.