Tertiary Ginkgo Ovulate Organs with Associated Leaves from North Dakota, U.S.A., and Their Evolutionary Significance Author(s): Zhiyan Zhou, Cheng Quan, Yu-Sheng (Christopher) Liu Reviewed work(s): Source: International Journal of Plant Sciences, Vol. 173, No. 1 (January 2012), pp. 67-80 Published by: The University of Chicago Press Stable URL: http://www.jstor.org/stable/10.1086/662651 . Accessed: 23/12/2011 02:35 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 support@jstor.org. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to International Journal of Plant Sciences. http://www.jstor.org