Petrorhagia saxifraga (L.) Link (syn.: Tunica saxifraga (L.) Scop.) (C and S-Eur., SW-Eur.) – A rare but increasing alien, mostly an escape from cultivation. Usually ephemeral but sometimes temporarily persisting locally. Probably first recorded on waste land in Brussel (Heyzel) in 1948 (Vanhecke 1975). Reported from a former railway track near Gent (nature reserve Bourgoyen-Ossemeersen) in 1976 (Reynaerts 1982) and still present in this area. In the past years also observed in several different other localities in Flanders (see here for an up-to-date overview: http://waarnemingen.be/soort/view/17146). In 2013 also recorded in a rather remote locality in the Antwerp port area (comm. D. De Beer). In this locality probably not associated with gardens.
Petrorhagia saxifraga is sometimes included in wild flower seed mixtures.
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Selected literature:
Feder J. (2008) Die Sprossende Felsennelke Petrorhagia prolifera im Landkreis Diepholz. Bremer Botanische Briefe 1: 10-11.
Frühauf S. (2007) Die Steinbrech-Felsennelke (Petrorhagia saxifraga (L.) Link 1831) im Stadtgebiet von Kassel. Flor. Rundbr. 40: 105-109.
Garve E. (2001) Steinbrech-Felsennelke (Petrorhagia saxifraga) in der Lüneburger Heide. Floristische Notizen aus der Lüneburger Heide 9: 23-24. [available online at: http://www.kaiser-alw.de/pdf/Fl09_01.pdf]
Kunitz T. (1997) Petrorhagia saxifraga (L.) Link 1831 und Bupleurum rotundifolium L. 1753, zwei bemerkenswerte Pflanzenarten im Landkreis Hildesheim. Floristische Rundbriefe 31(2): 139-142.
Lemke T. (2012) Petrorhagia saxifraga (Caryophyllaceae) als Adventivart auf Ruderalstandorten in Mecklenburg-Vorpommern. Botanischer Rundbrief für Mecklenburg-Vorpommern 49: 24-29. [available online at: http://geobot.botanik.uni-greifswald.de/Material/RB%2049%20Text.pdf]
Ocana M.E. & Martin Mosquero M.A. (1996) Petrorhagia saxifraga, una nueva especie para la flora de Andalucía occidental. Acta Bot. Malacitana 21: 326. [available online at: http://www.biolveg.uma.es/abm/Volumenes/vol21/21_Ocana.pdf]
Reynaerts H. (1982) Petrorhagia saxifraga (L.) Link te Drongen. Dumortiera 23: 32.
Trigas P., Kougioumoutzis K., Ermidou A. & Kalpoutzakis E. (2018) Multivariate morphometric analysis of Petrorhagia subsect. Saxifragae (Caryophyllaceae) in Greece, with a new species from SE Peloponnisos: P. laconica. Willdenowia 48(1):137-146. [available online at: http://www.bioone.org/doi/pdf/10.3372/wi.48.48110]
Vanhecke L. (1975) Petrorhagia saxifraga, ook bij ons adventief. Dumortiera 3: 31.