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Xerox University Microfilms INFORMATION TO USERS This material was produced from a microfilm copy of the original document. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon die quality of the original submitted. The following explanation of techniques is provided to help you understand markings or patterns which may appear on this reproduction. 1. The sign or "target" for pages apparently lacking from the document photographed is "Missing Pago(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting thru an image and duplicating adjacent pages to insure you complete continuity. 2. When an image on the film is obliterated with a large round black mark, it is an indication that the photographer suspected that the copy may have moved during exposure and thus cause a blurred image. You will find a good image of the page in the adjacent frame. 3. When a map, drawing or chart, etc., was part of the material being photographed the photographer followed a definite method in "sectioning" the material. It is customary to begin photoing at the upper left hand corner of a large sheet and to continue photoing from left to right in equal sections with a small overlap. If necessary, sectioning is continued again - beginning below the first row and continuing on until complete. 4. The majority of users indicate that the textual content is of greatest value, however, a somewhat higher quality reproduction could be made from "photographs" if essential to the understanding of the dissertation. Silver prints of "photographs" may be ordered at additional charge by writing the Order Department, giving the catalog number, title, author and specific pages you wish reproduced. 5. PLEASE NOTE: Some pages may have indistinct print. Filmed as received. Xerox University Microfilms 300 North ZMb Road Ann Arbor, Michigan 43106 HAYNES, Robert Ralph, 1945- A REVISION OF NORTH AMERICAN POTAMOGETON SUBSECTION PUSILLI (POTAMOGETONACEAE). The Ohio State University, Ph.D., 1973 Botany University Microfilms, A XEROX Company, Ann Arbor, Michigan THIS DISSERTATION HAS BEEN MICROFILMED EXACTLY AS RECEIVED. A REVISION OF NORTH AMERICAN POIAMOGEION SUBSECTION PUSILLI (POTAMOGETONACEAE) DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By Robert Ralph Haynes, B.S., M.Sc. * * * * * The Ohio State University 1973 Reading Committee Approved by John A. Schmitt, Ph. D. Ronald L. Stuckey, Ph. D. Adviser Tod F. Stuessy, Ph. D. Graduate Program in Botany ACKNOWLEDGMENTS I am grateful to Dr.. Ronald L. Stuckey, who supervised this study, for his advice and constant encouragement during the course of my work. Appreciation is also owed to the members of my reading committee, Dr. John A. Schmitt, Dr. Stuckey, and Dr. Tod F. Stuessy, for their critical reading of the manuscript; to Dr. Edward G. Voss for help with nomenclature; to Miss Judy Canne, Mr. Robert C. Gardner, and Mr. David Keil for their helpful suggestions; to the curators of the herbaria from which specimens were borrowed; to the staffs at Kew Botanical Gardens and the British Museum for their painstaking search for the holotype of Potamogeton stHoHfoHusi to the Linnean Society of London for the photograph of the holotype of P. p u sillu s; to ny colleagues at the many libraries who supplied xerox copies of many original descriptions; to Mr. Robert C. Gardner, Dr. Pete Hostetter, and Mr. Robert Kalinsky for their help with the photographs; to Dr. Eugene C. Ogden, Mr. Stanley Smith, Dr. Edward G. Voss, and Dr. Steven Young for help in locating populations of Potamogeton in the field; and to the University of Michigan Biological Station for facili­ tie s and support for two summers field work. Finally, many thanks are due to my family for the patience and constant encouragement during the entire course of my work. Field work was supported in part by a Research Grant from the Ohio Academy of Science and Sigma Xi Grant-in-Aid for Research. 11 VITA February 24, 1945 . Born, Minden, Louisiana August 1957 . B.S., Louisiana Polytechnic Institute, Ruston, Louisiana November 19, 1967 . Married Elizabeth Edna Zappa of Athens, Louisiana April 19, 1969 . A child, Robert Charles, was born May 1969 .... M.Sc., thesis entitled "A Monograph of the Genus Conopholis (Oroban- chaceae)," Department of Biology, University of Southwestern Louisiana, Lafayette, Louisiana September 1969-January 1970 . Teacher, Cecila Jr. High School, Cecila, Louisiana February 1970-June 1971 . Assistant Curator of the Herbarium, Department of Botany, The Ohio State University, Columbus, Ohio June 1970 Awarded a Grant-in-Aid of Research from The Society of The Sigma Xi for field Study of Potamogeton subsection PuailH in northeastern United States June 1970 Awarded a Grant-in-Aid of Research from The Ohio Academy of Science for field Study of Potamogeton in Ohio June 1971-August 1971 Teaching A ssistantship, The University of Michigan Biological Station, PelIston, Michigan September 1971-June 1972 . Teaching A ssistantship, Department of Botany, The Ohio State University, Columbus, Ohio June 1972-August 1972 Teaching A ssistantship, The University of Michigan Biological Station, Pellston, Michigan 111 September 1972-June 1973 .... Teaching Associate, Department of Botany, The Ohio State University, Columbus, Ohio PUBLICATIONS Potamogeton in Louisiana. 1968. Proc. Louisiana Acad. Sc1. 31: 82-90. Blyxa aubertii (Hydrocharitaceae) in Louisiana: New to North America. 1969. Sida 3: 343-344. (with John W. Thieret and David H. Dike) Cyperus giganteua (Cyperaceae) in Florida. 1969. Sida 3: 345. (with Alex Lasseigne) Conopholis alpina Llebmann var. mexiaana (Gray ex Watson) Haynes, Comb. Nov. 1969. Sida 3: 347. Family 174. Orobanchaceae. In Woodson, R. F., J r. & R. W. Schery. Flora of Panama. 1970. Ann. Missouri Bot. Gard. 57: 131-134. A Monograph of the Genus Conopholis (Orobanchaceae). MS Thesis. University of Southwestern Louisiana. 1969. 70 pp. A Monograph of the Genus Conopholis (Orobanchaceae). 1971. Sida 4: 246-264. A Re-evaluation of Potamogeton fibrillosus Fern. 1973, Rhodora 75: 75-77. (with James L. Reveal) Potamogeton. In. Cusick, A. and Silberhorn, G. Flora of Non-glaciated Onio. (in press 1972. Ohio Biological Survey Report) Najadaceae. In Woodson, R. F.» Jr. & R. W. Schery. Flora of Panama. (in press"l972. Ann. Missouri Bot. Gard.) Book Review. Manual of the Southeastern Flora (Facsimile ed.) John Kunkel Small, (in press 1972. Ohio J. S ci.) FIELDS OF STUDY Major Field: Botany Studies 1n Vascular Plant Taxonomy (Plant Systematics). Associate Professor Ronald L. Stuckey Studies In Aquatic Vascular Plant Biology. Associate Professor Ronald L. Stuckey V TABLE OF CONTENTS Page ACKNOWLEDGMENTS ................................................................................................ 1i VITA .......................................................................................... iil LIST OF TABLES................................. v11t LIST OF FIGURES................................................................................................ 1x INTRODUCTION .............................................................. 1 TAXONOMIC HISTORY..................................... 4 MORPHOLOGY ........................................................................................................ 6 H a b i t ..................................................... 6 Stem ............................................................................................................ 6 Leaf B l a d e s ..........................................: ............................................. 8 S t i p u l e .................................................................................................... 9 Winter B u d s ............................................................................................ 10 Inflorescence .................................................................. 11 P e d u n c le s ................................................................................................ 12 Flower .... ........................................................................................ 12 F r u its ................................. 14 VEGETATIVE DIMORPHISM......................................... 16 REPRODUCTIVE ECOLOGY...................................................' ................................ 25 Reproduction ............................................................................................ 25 Pollination ........................ 25 Germination .......... 26 v 1 CYTOLOGY................................................................................................................ 27 PHYLETIC RELATIONSHIPS ..................... 29 Generic Relationships ... 29 Subsectlonal Relationships ............................................................... 31 TAXONOMIC TREATMENT .................................. 38 Generic Description ......................................... 41 Subsectional Description ............................................. 43 Key to the Taxa ....................................................................................... 44 Potamogeton fvieeii ................................. 47 Potamogeton etriatifolius . ...................................................... 54 Potamogeton obtu sifoliu e ........ 53 Potamogeton h illii
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