Revised recognition of a high Sierran Potentilla (Rosaceae) as Potentilla amicarum

  • Barbara Ertter University and Jepson Herbaria, University of California and Snake River Plains Herbarium, Boise State University

Abstract

Potentilla amicarum Ertter is provided for plants from high elevations (2700–3700 m) in the southern and central Sierra Nevada, and also the White and Sweetwater mountains of California, that have most often been treated as depauperate P. drummondii or P. bruceae, or else P. breweri with subpinnate leaves. The name P. breweri var. viridis Jepson has sometimes been applied to these plants, but the type of that name is inter-preted as the hybrid of P. wheeleri and P. breweri. A hybrid origin is hypothesized involving P. breweri, P. drummondii, and/or P. glaucophylla. The size range and elevation of P. bruceae in recent floristic treatments is adjusted accordingly, and the distribution of P. drummondii in California is discussed.

References

Clausen, J., D.D. Keck, & W.M. Hiesey. 1940. Experimental studies on the nature of species. I. Effect of varied environments on western North American plants. Carnegie Inst. Washington Publ. 520:1–452.
Eriksen, B. 1996. Mating systems in two species of Potentilla from Alaska. Folia Geobot. Phytotax. 31:333–344.
Ertter, B. 1992. A re-evaluation of Potentilla drummondii and P. breweri (Rosaceae), with the new species Potentilla morefieldii. Brittonia 44:429–435.
Ertter, B. 1993. Potentilla. In: J.C. Hickman, ed. The Jepson manual: Higher plants of California. University of California Press, Berkeley, U.S.A. Pp. 964–969.
Ertter. B. 2012. Potentilla. In: B.G. Baldwin, D.H. Goldman, D.J. Keil, R. Patterson, T.J. Rosatti, & D.H. Wilken, eds. The Jepson manual: Vascular plants of California (2nd ed.). University of California Press, Berkeley, U.S.A. Pp. 1191–1195.
Ertter, B, R. Elven, J.L. Reveal, & D.F. Murray. 2015 [2014]. Potentilla. In: Flora of North America Editorial Committee, eds. Flora of North America north of Mexico. Oxford University Press, New York, U.S.A., and Oxford, U.K. 9:121–218.
Ertter, B. & D. Mansfield. 2007. A new variety of Potentilla gracilis (Rosaceae) and re-evaluation of the Potentilla drummondii complex. Madroño 54:180–186.
Jepson, W.L. 1936. A flora of California. Vol. II. Capparidaceae to Cornaceae. Associated Students Store, University of California, Berkeley, California, U.S.A.
Johnston, B.C. & B. Ertter. 2010. Potentilla uliginosa (Rosaceae: Rosoideae), a new presumed extinct species from Sonoma County, California. J. Bot. Res. Inst. Texas 4:13–18.
Johnston, B.C. 1980. Studies of population variability leading to a new classification of Potentilla sect. Multijugae (Rosaceae). Doctoral dissertation, University of Colorado, Boulder, U.S.A.
Stein, B.R. 2001. On her own terms: Annie Montague Alexander and the rise of science in the American West. University of California Press, Berkeley, U.S.A.
Published
2017-07-24
How to Cite
Ertter, B. (2017). Revised recognition of a high Sierran Potentilla (Rosaceae) as Potentilla amicarum. Journal of the Botanical Research Institute of Texas, 11(1), 11-18. https://doi.org/10.17348/jbrit.v11.i1.1131