Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1962 Taxonomy and distribution of the genus Cenchrus Donald Gordon DeLisle Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Botany Commons Recommended Citation DeLisle, Donald Gordon, "Taxonomy and distribution of the genus Cenchrus " (1962). Retrospective Theses and Dissertations. 2098. https://lib.dr.iastate.edu/rtd/2098 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact
[email protected]. This dissertation has been 63-1583 microfilmed exactly as received DeLISLE, Donald Gordon, 1923— TAXONOMY AND DISTRIBUTION OF THE GENUS CENCHRUS. Iowa State University of Science and Technology Ph.D., 1962 Botany University Microfilms, Inc., Ann Arbor, Michigan TAXONOMY AND DISTRIBUTION OF THE GENUS OENOHRUS by Donald Gordon DeLisle A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Major Subject: Plant Taxonomy Approved: Signature was redacted for privacy. In Charge of Major Wort Signature was redacted for privacy. Head of Major Dez&frtment Signature was redacted for privacy. B.y of Gradua të Ce Iowa State University Of Science and Technology Ames, Iowa 1962 ii TABLE OF CONTENTS Page INTRODUCTION 1 METHODS AND MATERIALS , 3 MORPHOLOGY 8 FLORAL BIOLOGY 15 CYTOLOGY 18 GENERIC RELATIONSHIPS AND LIMITS 25 PHYLOGENY 27 THE GENUS CENCHRUS 38 LITERATURE CITED 170 ACKNOWLEDGEMENTS 184 APPENDIX 185 1 .