BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. A Numerical Taxonomic Study of Trema (Ulmaceae) from Togo,West Africa Author(s): Luc St-Laurent, Bernard R. Baum, Koffi Akpagana, and John T. Arnason Source: Systematic Botany, 25(3):399-413. Published By: The American Society of Plant Taxonomists DOI: http://dx.doi.org/10.2307/2666686 URL: http://www.bioone.org/doi/full/10.2307/2666686 BioOne (www.bioone.org ) is a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses. Your use of this PDF, the BioOne Web site, and all posted and associated content indicates your acceptance of BioOne’s Terms of Use, available at www.bioone.org/page/terms_of_use . Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Commercial inquiries or rights and permissions requests should be directed to the individual publisher as copyright holder.