Buzz-Pollination and Patterns in Sexual Traits in North European Pyrolaceae Author(s): Jette T. Knudsen and Jens Mogens Olesen Reviewed work(s): Source: American Journal of Botany, Vol. 80, No. 8 (Aug., 1993), pp. 900-913 Published by: Botanical Society of America Stable URL: http://www.jstor.org/stable/2445510 . Accessed: 08/08/2012 10:49 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact
[email protected]. Botanical Society of America is collaborating with JSTOR to digitize, preserve and extend access to American Journal of Botany. http://www.jstor.org American Journalof Botany 80(8): 900-913. 1993. BUZZ-POLLINATION AND PATTERNS IN SEXUAL TRAITS IN NORTH EUROPEAN PYROLACEAE1 JETTE T. KNUDSEN2 AND JENS MOGENS OLESEN Departmentof ChemicalEcology, University of G6teborg, Reutersgatan2C, S-413 20 G6teborg,Sweden; and Departmentof Ecology and Genetics,University of Aarhus, Ny Munkegade, Building550, DK-8000 Aarhus,Denmark Flowerbiology and pollinationof Moneses uniflora, Orthilia secunda, Pyrola minor, P. rotundifolia,P. chlorantha, and Chimaphilaumbellata are describedand discussedin relationto patternsin sexualtraits and possibleevolution of buzz- pollinationwithin the group. The largenumber of pollengrains are packedinto units of monadsin Orthilia,tetrads in Monesesand Pyrola,or polyadsin Chimaphila.Pollen is thesole rewardto visitinginsects except in thenectar-producing 0.