1. Pseudoturritis turrita (L.) Al-Shehbaz (syn.: Arabis turrita L.) (S and C-Eur., N-Afr., W-As.) – A very rare and much decreasing but still locally naturalized escape from cultivation. Apparently first collected in 1862 in Bilstain (near Verviers), without further details. Known in this area from several other localities (Mangombroux, Ensival, Lambermont, Pépinster, etc.) and still confirmed in the 1940’s but now gone. By far best-documented from the surroundings of the ruins of the former abbey of Aulne-Landelies (at least since 1863 and still present today). Pseudoturritis turrita not only survives on the old ruins but also in nearby suitable habitats (rocks, abandoned quarries, etc.). Furthermore also discovered in a road verge near Marchiennes-au-Pont in 1978 (said to be naturalized).
Pseudoturritis turrita usually grows on old, sun-exposed walls and calcareous rocks.
Like Arabis collina, this species is no longer cultivated as an ornamental in Belgium and its future disappearance is nearly inevitable (although, at least for the time being, it still seems firmly established in the surroundings of Aulne-Landelies).
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References
Gauckler K. (1964) Arabis turrita, die Turm-Gänsekresse, ein isolierter Vorposten südlicher Flora in Franken. Bericht der Naturforschenden Gesellschaft Bamberg 39: 39-44.
Palmer J.R. (1990) Arabis turrita - a garden weed in West Kent., BSBI News 36: 26.
Schuhwerk H., Schuhwerk R. & Prager L. (1991) Die Turm-Gänsekresse, Arabis turrita L., neu für die Südliche Frankenalb. Ber. Bayer. Bot. Ges. 62: 267.