Bergenia crassifolia (L.) Fritsch (Siberia) - A rare escape from or, more likely, relic of cultivation or a throw-out. Possibly locally more or less persisting or naturalizing. In recent years it has been reliably recorded, for instance, from Etikhove.
This species combines glabrous leaf margins, wedge-shaped leaf bases and inflorescence axes without stalked glands.
Bergenia crassifolia is a regularly reported escape from cultivation. Records are available, for instance, from the British Isles (Stace 2010), Germany (Breitfeld 2016), Sweden (Karlsson 1997), Switzerland (Info Flora 2017), etc.
Selected literature:
Breitfeld M. (2016) Waldwege als Adventivhabitate. Sächsische Floristische Mitteilungen 18: 9-34. [available online at: http://www.saechsischer-heimatschutz.de/files/heimatschutz/pdf/Service%2...
Info Flora (2017) Das nationale Daten- und Informationszentrum der Schweizer Flora [available online at: https://www.infoflora.ch/de/flora/932-.html] (accessed 6 July 2017)
Karlsson T. (1997) Förteckning över svenska kärlväxter. Svensk Bot. Tidskr. 91: 241-560.
Stace C. (2010) New flora of the British Isles, 3th ed.: XXXII + 1232 p. Cambridge University Press.