Ann. Bot. Fennici 44: 379–388 ISSN 0003-3847 Helsinki 26 October 2007 © Finnish Zoological and Botanical Publishing Board 2007 Potentilla sterneri (Rosaceae), a “new” species from Sweden Thomas Gregor1 & Thomas Karlsson2 1) Hochschule Vechta, Driverstrasse 22, D-49377 Vechta, Germany (e-mail: thomas.gregor@uni- vechta.de) 2) Swedish Museum of Natural History, P.O. Box 50007, SE-104 05 Stockholm, Sweden (e-mail:
[email protected]) Received 31 July 2006, revised version received 9 Feb. 2007, accepted 2 Mar. 2007 Gregor, T. & Karlsson, T. 2007: Potentilla sterneri (Rosaceae), a “new” species from Sweden. — Ann. Bot. Fennici 44: 379–388. Potentilla sterneri T. Gregor & Karlsson sp. nova (Rosaceae) from southeastern Sweden is described and illustrated. The morphological characters of P. sterneri are compared to those of P. argentea, P. crantzii, and P. neumanniana. For nearly 200 years P. sterneri was known under misapplied names, P. collina, P. wimanniana (often as “P. Wiemanniana”), or P. sordida. Potentilla sterneri is mainly associated with grazed low-productive grassland. On Öland and Gotland it still exists in many popula- tions, but few remain in Blekinge and Småland. Names associated with the Potentilla collina group in Sweden are typified. — Flora Nordica note no. 33. Key words: new species, nomenclature, Potentilla, Rosaceae, taxonomy The Potentilla collina group in ish plants have a slightly pubescent, not gla- Scandinavia brous, receptaculum. He described P. argentea var. sordida from Öland (Borgholm, Resmo), Taxa of the Potentilla collina group appeared differering from P. collina among other char- early in Swedish botanical literature. Hartman acters by shining leaves, whitish tomentum of (1820) published P.