Taxonomy of the New World species of Lotus (Leguminosae: Loteae)
Ana M. Arambarri A C , Sebastián A. Stenglein A B , Marta N. Colares A and María C. Novoa AA Cátedra de Morfología Vegetal, Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, C.C. 31, 1900 La Plata, Argentina.
B Becario CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), C.C. 327, 1900 La Plata, Argentina.
C Corresponding author. Email: anaramba@infovia.com.ar
Australian Journal of Botany 53(8) 797-812 https://doi.org/10.1071/BT04101
Submitted: 19 July 2004 Accepted: 4 April 2005 Published: 14 December 2005
Abstract
The aims of the present study were to elucidate the relationships of the New World Lotus species groups, subgenera Acmispon Raf. (sections Microlotus Benth. and Simpeteria Ottley), Hosackia Benth. and Syrmatium Vog., and to compare these results with previous classifications and recent morphological and molecular phylogenetic hypotheses. A numerical taxonomic study using unweighted pair-group arithmetic average clustering was performed. The phenogram was generated from 34 operational taxonomic units (OTUs) × 41 characters (four vegetative characters and the basic chromosome numbers, 16 epidermal traits and 20 reproductive characters). The epidermal microcharacters (epidermal cells, stomata, stomatal index and trichomes) are described and summarised for 18 species of Hosackia and Syrmatium, and the remaining characters were derived from the literature. Phenetic results resolved four groups of species which coincide with the new genera Acmispon, Hosackia Douglas ex Benth., Ottleya D.D.Sokoloff and Syrmatium proposed, having taken into consideration the most recent morphological and phylogenetic hypotheses.
Acknowledgments
We thank M.B. Aulicino who provided helpful suggestions on numerical techniques, and the reviewers for critically reading the manuscript and for their valuable suggestions. We also thank G. J. Allan and M. Wall (Rancho Santa Ana Botanic Garden, California), W. Barthlott (Bonn), M. Luckow and L. Kelly (BH), D. D. Sokoloff (Moscow State Unversity, Russia), A. Delgado-Salinas and M. Sousa S. (MEXU), and J. L. Strother (UC, JEPS) for supplying literature and herbarium material. Furthermore, we thank M. Sánchez, (CIC-PBA) of the electron microscopy service of Centro de Investigación y Desarrollo en Procesos Catalíticos de La Plata (CINDECA) for technical assistance. This research was supported by Programa de Incentivos a los docentes-investigadores, Decreto 2427/93, Secretaría de Política Universitaria del Ministerio de Educación de la Nación, Argentina
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