Geum ternatum

Geum ternatum (Stephan) Smedmark (syn.: Waldsteinia ternata (Stephan) Fritsch) (SE Eur., As.) – A very rare but increasing escape from cultivation or garden throw-out. Recorded for the first time in 2008 in Mol on waste land (former nursery). Since then, repeatedly seen in this area. An up-to-date overview of recent records in Belgium is available here: http://waarnemingen.be/soort/view/147495. A future, local naturalization is not unlikely.

Geum ternatum is now frequently cultivated for ground cover and new records will surely come to light. It is rather reminiscent of Potentilla indica (syn.: Duchesnea indica): both species are creeping perennials with ternate leaves and yellow petals. However, Geum ternatum lacks the conspicuous epicalyx of Duchesnea and its fruits are not juicy.

Plants in cultivation are usually ascribed to subsp. trifolia (Rochel ex W.D.J. Koch) Teppner, the European taxon (Jäger & al. 2008).

Selected literature:


Heltmann H. & Fink H. (1971) Contribuţii la biologia, ecologia şi răspîndirea speciei Waldsteinia Ternata (Steph.) Fritsch în Ţara Bîrsei. (Beitrage zur Biologie, Ökologie und Verbreitung von Waldsteinia ternata (Steph.) Fritsch in Burzenland). Comunicări de botanică 12: 263-278.

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.

Maurer W., Pagitz W. & Teppner H. (1975) Ein weiterer Fund von Waldsteinia ternata (Rosaceae) in Kärnten. Carinthia II 164(84): 245-247.

Smedmark J.E.E. (2006) Recircumscription of Geum (Colurieae: Rosaceae). Bot. Jahrb. Syst. 126(4): 409-417.

Teppner H. (1974) Waldsteinia ternata (Rosaceae) und ihre Vorkommen in den südöstlichen Alpen. Phyton (Austria) 16(1-4): 281-299. [available online at: http://www.landesmuseum.at/pdf_frei_remote/PHY_16_1_4_0281-0299.pdf]  

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith